PHP - curl:
$username = 'myusername';
$password = 'mypassword';
...
curl_setopt($ch, CURLOPT_USERPWD, $username . ":" . $password);
...
PHP - POST in WordPress:
$username = 'myusername';
$password = 'mypassword';
...
wp_remote_post('https://...some...api...endpoint...', array(
'headers' => array(
'Authorization' => 'Basic ' . base64_encode("$username:$password")
)
));
...
If you need by several params:
$ids = [1,2,3,4];
$not_ids = [5,6,7,8];
DB::table('table')->whereIn('id', $ids)
->whereNotIn('id', $not_ids)
->where('status', 1)
->get();
In my index.php I'm loading maybe foobarfunc() like this:
foobar::foobarfunc(); // Wrong, it is not static method
but can also be
$foobar = new foobar; // correct
$foobar->foobarfunc();
You can not invoke method this way because it is not static method.
foobar::foobarfunc();
You should instead use:
foobar->foobarfunc();
If however you have created a static method something like:
static $foo; // your top variable set as static
public static function foo() {
return self::$foo;
}
then you can use this:
foobar::foobarfunc();
This may or may not be useful to others, but for my particular use case I just wanted additional parameters to be passed back from the form when the option was selected - these parameters had the same values for all options, so... my solution was to include hidden inputs in the form with the select, like:
<FORM action="" method="POST">
<INPUT TYPE="hidden" NAME="OTHERP1" VALUE="P1VALUE">
<INPUT TYPE="hidden" NAME="OTHERP2" VALUE="P2VALUE">
<SELECT NAME="Testing">
<OPTION VALUE="1"> One </OPTION>
<OPTION VALUE="2"> Two </OPTION>
<OPTION VALUE="3"> Three </OPTION>
</SELECT>
</FORM>
Maybe obvious... more obvious after you see it.
The most upvoted answer above is weird in a way that it simply clears the Clipboard and then gets the content (which is then empty). One could clear the clipboard to be sure that some clipboard content type like "formated text" does not "cover" your plain text content you want to save in the clipboard.
The following piece of code replaces all newlines in the clipboard by spaces, then removes all double spaces and finally saves the content back to the clipboard:
import win32clipboard
win32clipboard.OpenClipboard()
c = win32clipboard.GetClipboardData()
win32clipboard.EmptyClipboard()
c = c.replace('\n', ' ')
c = c.replace('\r', ' ')
while c.find(' ') != -1:
c = c.replace(' ', ' ')
win32clipboard.SetClipboardText(c)
win32clipboard.CloseClipboard()
Use immediate children selector >
:
$('#tblOne > tbody > tr')
Description: Selects all direct child elements specified by "child" of elements specified by "parent".
A good alternative is SqlCmd, since it does include headers, but it has the downside of adding space padding around the data for human readability. You can combine SqlCmd with the GnuWin32 sed (stream editing) utility to cleanup the results. Here's an example that worked for me, though I can't guarantee that it's bulletproof.
First, export the data:
sqlcmd -S Server -i C:\Temp\Query.sql -o C:\Temp\Results.txt -s" "
The -s" "
is a tab character in double quotes. I found that you have to run this command via a batch file, otherwise the Windows command prompt will treat the tab as an automatic completion command and will substitute a filename in place of the tab.
If Query.sql contains:
SELECT name, object_id, type_desc, create_date
FROM MSDB.sys.views
WHERE name LIKE 'sysmail%'
then you'll see something like this in Results.txt
name object_id type_desc create_date ------------------------------------------- ----------- ------------------- ----------------------- sysmail_allitems 2001442204 VIEW 2012-07-20 17:38:27.820 sysmail_sentitems 2017442261 VIEW 2012-07-20 17:38:27.837 sysmail_unsentitems 2033442318 VIEW 2012-07-20 17:38:27.850 sysmail_faileditems 2049442375 VIEW 2012-07-20 17:38:27.860 sysmail_mailattachments 2097442546 VIEW 2012-07-20 17:38:27.933 sysmail_event_log 2129442660 VIEW 2012-07-20 17:38:28.040 (6 rows affected)
Next, parse the text using sed:
sed -r "s/ +\t/\t/g" C:\Temp\Results.txt | sed -r "s/\t +/\t/g" | sed -r "s/(^ +| +$)//g" | sed 2d | sed $d | sed "/^$/d" > C:\Temp\Results_New.txt
Note that the 2d
command means to delete the second line, the $d
command means to delete the last line, and "/^$/d"
deletes any blank lines.
The cleaned up file looks like this (though I replaced the tabs with |
so they could be visualized here):
name|object_id|type_desc|create_date sysmail_allitems|2001442204|VIEW|2012-07-20 17:38:27.820 sysmail_sentitems|2017442261|VIEW|2012-07-20 17:38:27.837 sysmail_unsentitems|2033442318|VIEW|2012-07-20 17:38:27.850 sysmail_faileditems|2049442375|VIEW|2012-07-20 17:38:27.860 sysmail_mailattachments|2097442546|VIEW|2012-07-20 17:38:27.933 sysmail_event_log|2129442660|VIEW|2012-07-20 17:38:28.040
If you are using default SSH setup in your VagrantFile and started seeing SSH authentication errors after re-associating your VM box due to crash, try replacing public key in your vagrant machine.
Vagrant replaces public key associated with insecure private key pair at each log out due to security reasons. If you didn't properly shut down your machine, public/private key pair can go out of sync, causing SSH authentication error.
To resolve this issue, simply load up the current insecure private key and then copy the public key pair into your VM's authorized_keys file.
Even more simple, pass the $event
object to ng-click
to access the event properties. As an example:
<a ng-click="clickEvent($event)" class="exampleClass" id="exampleID" data="exampleData" href="">Click Me</a>
Within your clickEvent() = function(obj) {}
function you can access the data
value like this:
var dataValue = obj.target.attributes.data.value;
Which would return exampleData
.
Here's a full jsFiddle.
You should use thenReturn
or doReturn
when you know the return value at the time you mock a method call. This defined value is returned when you invoke the mocked method.
thenReturn(T value)
Sets a return value to be returned when the method is called.
@Test
public void test_return() throws Exception {
Dummy dummy = mock(Dummy.class);
int returnValue = 5;
// choose your preferred way
when(dummy.stringLength("dummy")).thenReturn(returnValue);
doReturn(returnValue).when(dummy).stringLength("dummy");
}
Answer
is used when you need to do additional actions when a mocked method is invoked, e.g. when you need to compute the return value based on the parameters of this method call.
Use
doAnswer()
when you want to stub a void method with genericAnswer
.Answer specifies an action that is executed and a return value that is returned when you interact with the mock.
@Test
public void test_answer() throws Exception {
Dummy dummy = mock(Dummy.class);
Answer<Integer> answer = new Answer<Integer>() {
public Integer answer(InvocationOnMock invocation) throws Throwable {
String string = invocation.getArgumentAt(0, String.class);
return string.length() * 2;
}
};
// choose your preferred way
when(dummy.stringLength("dummy")).thenAnswer(answer);
doAnswer(answer).when(dummy).stringLength("dummy");
}
It's not a cut and paste. The CASE
expression must return a value, and you are returning a string containing SQL (which is technically a value but of a wrong type). This is what you wanted to write, I think:
SELECT * FROM [Purchasing].[Vendor] WHERE
CASE
WHEN @url IS null OR @url = '' OR @url = 'ALL'
THEN PurchasingWebServiceURL LIKE '%'
WHEN @url = 'blank'
THEN PurchasingWebServiceURL = ''
WHEN @url = 'fail'
THEN PurchasingWebServiceURL NOT LIKE '%treyresearch%'
ELSE PurchasingWebServiceURL = '%' + @url + '%'
END
I also suspect that this might not work in some dialects, but can't test now (Oracle, I'm looking at you), due to not having booleans.
However, since @url
is not dependent on the table values, why not make three different queries, and choose which to evaluate based on your parameter?
You can use reset_index
to turn the index back into a column:
monthly_mean.reset_index().plot(x='index', y='A')
on Linux
hostname -I
on macOS
ipconfig getifaddr en0
hostname -I
can return multiple addresses in an unreliable order (see the hostname
manpage), but for me it just returns 192.168.1.X
, which is what you wanted.
I ran across this while on a hunt for answers myself after attempting to follow a guide using pm2. The goal is to automatically start a node.js application on a server. Some guides call out using pm2 startup systemd
, which is the path that leads to the question of using systemctl on Ubuntu 14.04. Instead, use pm2 startup ubuntu
.
You can redirect the output of a cmd prompt to a file using >
or >>
to append to a file.
i.e.
echo Hello World >C:\output.txt
echo Hello again! >>C:\output.txt
or
mybatchfile.bat >C:\output.txt
Note that using >
will automatically overwrite the file if it already exists.
You also have the option of redirecting stdin, stdout and stderr.
See here for a complete list of options.
You can execute raw query using ActiveRecord
. And I will suggest to go with SQL block
query = <<-SQL
SELECT *
FROM payment_details
INNER JOIN projects
ON projects.id = payment_details.project_id
ORDER BY payment_details.created_at DESC
SQL
result = ActiveRecord::Base.connection.execute(query)
Give them a trivial pom with these jars listed as dependencies and instructions to run:
mvn dependency:go-offline
This will pull the dependencies to the local repo.
A more direct solution is dependency:get, but it's a lot of arguments to type:
mvn dependency:get -DrepoUrl=something -Dartifact=group:artifact:version
Some RFID chips are read-write, the majority are read-only. You can find out if your chip is read-only by checking the datasheet.
As introduced in Angular 1.3
you can use ng-model-options attribute:
<input
id="searchText"
type="search"
placeholder="live search..."
ng-model="searchText"
ng-model-options="{ debounce: 250 }"
/>
a+
to open a file for reading, writing as well as create it if it doesn't exist.a+ Opens a file for both appending and reading. The file pointer is at the end of the file if the file exists. The file opens in the append mode. If the file does not exist, it creates a new file for reading and writing. -Python file modes
with open('"File.txt', 'a+') as file:
print(file.readlines())
file.write("test")
Note: opening file in a with
block makes sure that the file is properly closed at the block's end, even if an exception is raised on the way. It's equivalent to try-finally
, but much shorter.
How are you opening the rendered Markdown?
If you host it over HTTP, i.e. you access it via http://
or https://
, most modern browsers will refuse to open local links, e.g. with file://
. This is a security feature:
For security purposes, Mozilla applications block links to local files (and directories) from remote files. This includes linking to files on your hard drive, on mapped network drives, and accessible via Uniform Naming Convention (UNC) paths. This prevents a number of unpleasant possibilities, including:
- Allowing sites to detect your operating system by checking default installation paths
- Allowing sites to exploit system vulnerabilities (e.g.,
C:\con\con
in Windows 95/98)- Allowing sites to detect browser preferences or read sensitive data
There are some workarounds listed on that page, but my recommendation is to avoid doing this if you can.
The following code works:
@Override
protected synchronized void onDraw(Canvas canvas)
{
int stars = getNumStars();
float rating = getRating();
try
{
bitmapWidth = getWidth() / stars;
}
catch (Exception e)
{
bitmapWidth = getWidth();
}
float x = 0;
for (int i = 0; i < stars; i++)
{
Bitmap bitmap;
Resources res = getResources();
Paint paint = new Paint();
if ((int) rating > i)
{
bitmap = BitmapFactory.decodeResource(res, starColor);
}
else
{
bitmap = BitmapFactory.decodeResource(res, starDefault);
}
Bitmap scaled = Bitmap.createScaledBitmap(bitmap, getHeight(), getHeight(), true);
canvas.drawBitmap(scaled, x, 0, paint);
canvas.save();
x += bitmapWidth;
}
super.onDraw(canvas);
}
Try removing the entire settings.LOGGING
dictConfig and restart the server. If that works, rewrite the setting according to the v1.9 documentation.
https://docs.djangoproject.com/en/1.9/topics/logging/#examples
In visual studio, use the "Add Web Reference" feature and then enter in the URL of your web service.
By adding a reference to the DLL, you not referencing it as a web service, but simply as an assembly.
When you add a web reference it create a proxy class in your project that has the same or similar methods/arguments as your web service. That proxy class communicates with your web service via SOAP but hides all of the communications protocol stuff so you don't have to worry about it.
With Vagrant now you can have Docker as a provider. http://docs.vagrantup.com/v2/docker/. Docker provider can be used instead of VirtualBox or VMware.
Please note that you can also use Docker for provisioning with Vagrant. This is very different than using Docker as a provider. http://docs.vagrantup.com/v2/provisioning/docker.html
This means you can replace Chef or Puppet with Docker. You can use combinations like Docker as provider (VM) with Chef as provisioner. Or you can use VirtualBox as provider and Docker as provisioner.
Try This :-
set Read Only False ( Editable TextBox)
document.getElementById("txtID").readOnly=false;
set Read Only true(Not Editable )
var v1=document.getElementById("txtID");
v1.setAttribute("readOnly","true");
This can work on IE and Firefox also.
Kiran's answer is definetely the answer for my case.
In code part I split string to 4000 char strings and try to put them in to db.
Explodes with this error.
The cause of the error is using utf chars, those counts 2 bytes each. Even I truncate to 4000 chars in code(sth. like String.Take(4000)), oracle considers 4001 when string contains 'ö' or any other non-eng(non ascii to be precise, which are represented with two or bytes in utf8) characters.
Well, you do have to create a temp table, but it doesn't have to have the right schema....I've created a stored procedure that modifies an existing temp table so that it has the required columns with the right data type and order (dropping all existing columns, adding new columns):
GO
create procedure #TempTableForSP(@tableId int, @procedureId int)
as
begin
declare @tableName varchar(max) = (select name
from tempdb.sys.tables
where object_id = @tableId
);
declare @tsql nvarchar(max);
declare @tempId nvarchar(max) = newid();
set @tsql = '
declare @drop nvarchar(max) = (select ''alter table tempdb.dbo.' + @tableName
+ ' drop column '' + quotename(c.name) + '';''+ char(10)
from tempdb.sys.columns c
where c.object_id = ' +
cast(@tableId as varchar(max)) + '
for xml path('''')
)
alter table tempdb.dbo.' + @tableName + ' add ' + QUOTENAME(@tempId) + ' int;
exec sp_executeSQL @drop;
declare @add nvarchar(max) = (
select ''alter table ' + @tableName
+ ' add '' + name
+ '' '' + system_type_name
+ case when d.is_nullable=1 then '' null '' else '''' end
+ char(10)
from sys.dm_exec_describe_first_result_set_for_object('
+ cast(@procedureId as varchar(max)) + ', 0) d
order by column_ordinal
for xml path(''''))
execute sp_executeSQL @add;
alter table ' + @tableName + ' drop column ' + quotename(@tempId) + ' ';
execute sp_executeSQL @tsql;
end
GO
create table #exampleTable (pk int);
declare @tableId int = object_Id('tempdb..#exampleTable')
declare @procedureId int = object_id('examplestoredProcedure')
exec #TempTableForSP @tableId, @procedureId;
insert into #exampleTable
exec examplestoredProcedure
Note this won't work if sys.dm_exec_describe_first_result_set_for_object can't determine the results of the stored procedure (for instance if it uses a temp table).
The simplest Hello World example...
$hello = "Hello World"
$hello | Out-File c:\debug.txt
There is more to ++i and i++ than loops and performance differences. ++i returns a l-value and i++ returns an r-value. Based on this, there are many things you can do to ( ++i ) but not to ( i++ ).
1- It is illegal to take the address of post increment result. Compiler won't even allow you.
2- Only constant references to post increment can exist, i.e., of the form const T&.
3- You cannot apply another post increment or decrement to the result of i++, i.e., there is no such thing as I++++. This would be parsed as ( i ++ ) ++ which is illegal.
4- When overloading pre-/post-increment and decrement operators, programmers are encouraged to define post- increment/decrement operators like:
T& operator ++ ( )
{
// logical increment
return *this;
}
const T operator ++ ( int )
{
T temp( *this );
++*this;
return temp;
}
There is no way to get the logs for installing problems.
The first approach is trying to cast the list but this would work only if the List<>
were an ArrayList<>
. That is not the case. So you need the second approach, that is building a new ArrayList<>
with the elements of the List<>
The font may exist with different names, and not at all on some systems, so you need to use different variations and fallback to get the closest possible look on all systems:
font-family: "Comic Sans MS", "Comic Sans", cursive;
Be careful what you use this font for, though. Many consider it as ugly and overused, so it should not be use for something that should look professional.
As noted by CommonsWare in this question https://stackoverflow.com/a/16064418/1319061, this error can also occur if you are creating an anonymous subclass of a Fragment, since anonymous classes cannot have constructors.
Don't make anonymous subclasses of Fragment :-)
In my case, there was a disc space issue. I deleted some unwanted war files from my server and it worked after that.
You also can use StringUtils.isNoneEmpty("")
for check is null or empty.
The BEST way to use the AppData directory, IS to use Environment.ExpandEnvironmentVariable
method.
Reasons:
Examples:
string path;
path = @"%AppData%\stuff";
path = @"%aPpdAtA%\HelloWorld";
path = @"%progRAMfiLES%\Adobe;%appdata%\FileZilla"; // collection of paths
path = Environment.ExpandEnvironmentVariables(path);
Console.WriteLine(path);
%ALLUSERSPROFILE% C:\ProgramData
%APPDATA% C:\Users\Username\AppData\Roaming
%COMMONPROGRAMFILES% C:\Program Files\Common Files
%COMMONPROGRAMFILES(x86)% C:\Program Files (x86)\Common Files
%COMSPEC% C:\Windows\System32\cmd.exe
%HOMEDRIVE% C:
%HOMEPATH% C:\Users\Username
%LOCALAPPDATA% C:\Users\Username\AppData\Local
%PROGRAMDATA% C:\ProgramData
%PROGRAMFILES% C:\Program Files
%PROGRAMFILES(X86)% C:\Program Files (x86) (only in 64-bit version)
%PUBLIC% C:\Users\Public
%SystemDrive% C:
%SystemRoot% C:\Windows
%TEMP% and %TMP% C:\Users\Username\AppData\Local\Temp
%USERPROFILE% C:\Users\Username
%WINDIR% C:\Windows
You should add the g
modifier so that sed performs a global substitution of the contents of the pattern buffer:
echo dog dog dos | sed -e 's:dog:log:g'
For a fantastic documentation on sed, check http://www.grymoire.com/Unix/Sed.html. This global flag is explained here: http://www.grymoire.com/Unix/Sed.html#uh-6
The official documentation for GNU sed
is available at http://www.gnu.org/software/sed/manual/
We love Kubernetes is because once we give them what we want it goes on to figure out how to achieve it without our any involvement.
"create" is like playing GOD by taking things into our own hands. It is good for local debugging when you only want to work with the POD and not care abt Deployment/Replication Controller.
"apply" is playing by the rules. "apply" is like a master tool that helps you create and modify and requires nothing from you to manage the pods.
It is hardware problem at all.
If you have nView, turn off Desktop Manager. In case of ATI, turn off HydraVision.
This works fine on Eclipse Kepler (Standard) and Android Developer Tools Edition.
Why not use epoch and loop through easily.
long startDateEpoch = new java.text.SimpleDateFormat("dd/MM/yyyy").parse(startDate).getTime() / 1000;
long endDateEpoch = new java.text.SimpleDateFormat("dd/MM/yyyy").parse(endDate).getTime() / 1000;
long i;
for(i=startDateEpoch ; i<=endDateEpoch; i+=86400){
System.out.println(i);
}
function isEmpty(val) {
if(val.length ==0 || val.length ==null){
return 'emptyForm';
}else{
return 'not emptyForm';
}
}
$(document).ready(function(){enter code here
$( "form" ).submit(function( event ) {
$('input').each(function(){
var getInputVal = $(this).val();
if(isEmpty(getInputVal) =='emptyForm'){
alert(isEmpty(getInputVal));
}else{
alert(isEmpty(getInputVal));
}
});
event.preventDefault();
});
});
Make variables are not exported into the environment of processes make invokes... by default. However you can use make's export
to force them to do so. Change:
test: NODE_ENV = test
to this:
test: export NODE_ENV = test
(assuming you have a sufficiently modern version of GNU make >= 3.77 ).
(.*?)
matches anything - I've been using it for years.
I ran into this error because I was attempting to write a string to a cell which started with an "=".
The solution was to put an "'" (apostrophe) before the equals sign, which is a way to tell excel that you're not, in fact, trying to write a formula, and just want to print the equals sign.
I ran into the same problem. I use jdk 1.8 and maven 3.3.9 Once I export JAVA_HOME, I did not see this error. export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/
Edit your app at www.facebook.com/developers/ and set the "Site URL" to "http://localhost/myapppath".
When done - change it back.
For Swift 3 Xcode 8.......
let button = UIButton(frame: CGRect(x: 0, y: 0, width: container.width, height: container.height))
button.addTarget(self, action: #selector(self.barItemTapped), for: .touchUpInside)
func barItemTapped(sender : UIButton) {
//Write button action here
}
Try this...
SELECT TO_CHAR(column_name,'99G999D99MI')
as format_column
FROM DUAL;
You can do that using the SimpleDateFormat
class.
SimpleDateFormat formatter=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dates=formatter.format(mydate);
//mydate is your date object
I had the similar issue using Flurl.Http:
Flurl.Http.FlurlHttpException: Call failed. Cannot send a content-body with this verb-type. GET http://******:8301/api/v1/agents/**** ---> System.Net.ProtocolViolationException: Cannot send a content-body with this verb-type.
The problem was I used .WithHeader("Content-Type", "application/json")
when creating IFlurlRequest.
Nobody have mention the new type of "Pull to refresh" which shows on top of the action bar like in the Google Now or Gmail application.
There is a library ActionBar-PullToRefresh which works exactly the same.
If you installed using the graphical installer by BigSQL from the official postgres site and if you installed in the default location...
You can find your uninstaller in your home directory: /Users/<yourusername/PostGreSQL/uninstall/
From ser1 remove items present in ser2.
ser1 = pd.Series([1, 2, 3, 4, 5]) ser2 = pd.Series([4, 5, 6, 7, 8])
ser1[~ser1.isin(ser2)]
Try this:
$(document).bind("contextmenu",function(e){
return false;
});
This appears to be missing the providerName="System.Data.EntityClient"
bit. Sure you got the whole thing?
^https?://
You might have to escape the forward slashes though, depending on context.
I think you can adapt the function to substract the two timestamps:
return EXTRACT(MINUTE FROM
TO_TIMESTAMP(to_char(p_date1,'DD-MON-YYYY HH:MI:SS'),'DD-MON-YYYY HH24:MI:SS')
-
TO_TIMESTAMP(to_char(p_date2,'DD-MON-YYYY HH:MI:SS'),'DD-MON-YYYY HH24:MI:SS')
);
I think you could simplify it by just using CAST(p_date as TIMESTAMP)
.
return EXTRACT(MINUTE FROM cast(p_date1 as TIMESTAMP) - cast(p_date2 as TIMESTAMP));
Remember dates and timestamps are big ugly numbers inside Oracle, not what we see in the screen; we don't need to tell him how to read them. Also remember timestamps can have a timezone defined; not in this case.
As others have said, the minumum/maximum values the column can store and how much storage it takes in bytes is only defined by the type, not the length.
A lot of these answers are saying that the (11)
part only affects the display width which isn't exactly true, but mostly.
A definition of int(2)
with no zerofill specified will:
100
100
when output (not 0
or 00
)The only thing the (2)
will do is if zerofill is also specified:
1
will be shown 01
. The best way to see all the nuances is to run:
CREATE TABLE `mytable` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`int1` int(10) NOT NULL,
`int2` int(3) NOT NULL,
`zf1` int(10) ZEROFILL NOT NULL,
`zf2` int(3) ZEROFILL NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `mytable`
(`int1`, `int2`, `zf1`, `zf2`)
VALUES
(10000, 10000, 10000, 10000),
(100, 100, 100, 100);
select * from mytable;
which will output:
+----+-------+-------+------------+-------+
| id | int1 | int2 | zf1 | zf2 |
+----+-------+-------+------------+-------+
| 1 | 10000 | 10000 | 0000010000 | 10000 |
| 2 | 100 | 100 | 0000000100 | 100 |
+----+-------+-------+------------+-------+
This answer is tested against MySQL 5.7.12 for Linux and may or may not vary for other implementations.
Try this script to get your browser language
<script type="text/javascript">_x000D_
var userLang = navigator.language || navigator.userLanguage; _x000D_
alert ("The language is: " + userLang);_x000D_
</script>
_x000D_
Cheers
You can use the arithmetic operators to do relative time.
Time.now - 2.days
Will give you 2 days ago.
There is a third-party log4net adapter for the ASP.NET Core logging interface.
Only thing you need to do is pass the ILoggerFactory
to your Startup
class, then call
loggerFactory.AddLog4Net();
and have a config in place. So you don't have to write any boiler-plate code.
Like this:
xy.list <- split(xy.df, seq(nrow(xy.df)))
And if you want the rownames of xy.df
to be the names of the output list, you can do:
xy.list <- setNames(split(xy.df, seq(nrow(xy.df))), rownames(xy.df))
Something like:
SELECT id, email, IF(active = 1, 'enabled', 'disabled') AS account_status FROM users
This allows you to make operations and show it as columns.
EDIT:
you can also use joins and show operations as columns:
SELECT u.id, e.email, IF(c.id IS NULL, 'no selected', c.name) AS country
FROM users u LEFT JOIN countries c ON u.country_id = c.id
It depends on the language. While you can possibly check a boolean variable here:
for (int i = 0; i < 100 && stayInLoop; i++) { ... }
it is not possible to do it when itering over an array:
for element in bigList: ...
Anyway, break
would make both codes more readable.
An answer for the future: CSS 4 will probably contain the revert keyword, which reverts a property to its value from the user or user-agent stylesheet [source]. As of writing this, only Safari supports this – check here for updates on browser support.
In your case you would use:
.my_container ol, .my_container ul {
list-style: revert;
}
See also this other answer with some more details.
I had a doubt that whether the encrypted text will be same for single text when encryption done by multiple times on a same text??
This depends strongly on the crypto algorithm you use:
You can execute the following commands to initialize your local repository
mkdir newProject
cd newProject
touch .gitignore
git init
git add .
git commit -m "Initial Commit"
git remote add origin user@host:~/path_on_server/newProject.git
git push origin master
You should work on your project from your local repository and use the server as the central repository.
You can also follow this article which explains each and every aspect of creating and maintaining a Git repository. Git for Beginners
Yet another option would be:
SELECT * FROM mytable
WHERE TRUNC(mydate, 'YEAR') = TRUNC(SYSDATE, 'YEAR');
If your data set is too large first select required rows by Select(). it will stop further looping.
DataRow[] selected = table.Select("Product_id = 2")
Then loop through subset and update
foreach (DataRow row in selected)
{
row["Product_price"] = "<new price>";
}
Short circuiting means the second operator will not be checked if the first operator decides the final outcome.
E.g. Expression is: True || False
In case of ||, all we need is one of the side to be True. So if the left hand side is true, there is no point in checking the right hand side, and hence that will not be checked at all.
Similarly, False && True
In case of &&, we need both sides to be True. So if the left hand side is False, there is no point in checking the right hand side, the answer has to be False. And hence that will not be checked at all.
If you mean in parallel, I think the comma operator when used in conjunction with an expression can do that:
a[1]=1, a[2]=2, ..., a[indexSize];
or if you mean in a single construct, you could do that in a for loop:
for(int index = 0, value = 10; index < sizeof(array)/sizeof(array[0]); index++, value--)
array[index] = index;
//Note the comma operator in an arguments list is not the parallel operator described above;
You can initialize an array decleration:
array[] = {1, 2, 3, 4, 5};
You can make a call to malloc/calloc/sbrk/alloca/etc to allocate a fixed region of storage to an object:
int *array = malloc(sizeof(int)*numberOfListElements/Indexes);
and access the members by:
*(array + index)
Etc.
I'd just store it as CSV, if it's simple values then it should be all you need (XML is very verbose and serializing to/from it would probably be overkill but that would be an option as well).
Here's a good answer for how to pull out CSVs with LINQ.
By using
$_SERVER['REQUEST_METHOD']
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
// The request is using the POST method
}
For more details please see the documentation for the $_SERVER variable.
In C++20 you'll be able to use std::format
to do this:
unsigned char a = -58;
std::cout << std::format("{:b}", a);
Output:
11000110
In the meantime you can use the {fmt} library, std::format
is based on. {fmt} also provides the print
function that makes this even easier and more efficient (godbolt):
unsigned char a = -58;
fmt::print("{:b}", a);
Disclaimer: I'm the author of {fmt} and C++20 std::format
.
In 2020 I use the MoreLinq
Pipe
method. https://morelinq.github.io/2.3/ref/api/html/M_MoreLinq_MoreEnumerable_Pipe__1.htm
I have perfect answer for all this : I tried so many solution not able to get finally myself able to manage , please find detail answer below:
$.ajax({
traditional: true,
url: "/Conroller/MethodTest",
type: "POST",
contentType: "application/json; charset=utf-8",
data:JSON.stringify(
[
{ id: 1, color: 'yellow' },
{ id: 2, color: 'blue' },
{ id: 3, color: 'red' }
]),
success: function (data) {
$scope.DisplayError(data.requestStatus);
}
});
Controler
public class Thing
{
public int id { get; set; }
public string color { get; set; }
}
public JsonResult MethodTest(IEnumerable<Thing> datav)
{
//now datav is having all your values
}
There are two reasons why you cannot add generated content via CSS in the way you want:
generated content accepts content and not markup. Markup will not be evaluated but displayed only.
:before
and :after
generated content is added within the element, so even adding a space or letter and defining it as block
will not work.
There is an ::outside
pseudo element that might do what you want. However, there appears to be no browser support. (Read more here: http://www.w3.org/TR/css3-content/#wrapping)
Best bet is use a bit of jQuery here:
$('<br />').insertBefore('#restart');
I was having a similar issue with a property being null or undefined.
This ended up being that IE's document mode was being defaulted to IE7 Standards. This was due to the compatibility mode being automatically set to be used for all intranet sites (Tools > Compatibility View Setting > Display Intranet Sites in Compatibility View).
The ucfirst
function works if you do it like this.
function ucfirst(str) {
var firstLetter = str.slice(0,1);
return firstLetter.toUpperCase() + str.substring(1);
}
Thanks J-P for the aclaration.
You do not need any client side code if doing this is ASP.NET. The example below is a boostrap input box with a search button with an fontawesome icon.
You will see that in place of using a regular < div > tag with a class of "input-group" I have used a asp:Panel. The DefaultButton property set to the id of my button, does the trick.
In example below, after typing something in the input textbox, you just hit enter and that will result in a submit.
<asp:Panel DefaultButton="btnblogsearch" runat="server" CssClass="input-group blogsearch">
<asp:TextBox ID="txtSearchWords" CssClass="form-control" runat="server" Width="100%" Placeholder="Search for..."></asp:TextBox>
<span class="input-group-btn">
<asp:LinkButton ID="btnblogsearch" runat="server" CssClass="btn btn-default"><i class="fa fa-search"></i></asp:LinkButton>
</span></asp:Panel>
You can use mosquitto_sub
(which is part of the mosquitto-clients
package) and subscribe to the wildcard topic #
:
mosquitto_sub -v -h broker_ip -p 1883 -t '#'
this is old but, use nano, vim or gvim
People don't see the nice cool Stream producers all over the Java libs.
public static double[] list(){
return new Random().ints().asDoubleStream().toArray();
}
The right way to do this, starting with Spring 4.1, is to use a @TestPropertySource
annotation.
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:whereever/context.xml")
@TestPropertySource(properties = {"myproperty = foo"})
public class TestWarSpringContext {
...
}
See @TestPropertySource in the Spring docs and Javadocs.
this code returns only filenames with their extension (without a global path)
Dir.children("/path/to/search/")
This isn't easy, unless your regexp engine has special support for it. The easiest way would be to use a negative-match option, for example:
$var !~ /^foo$/
or die "too much foo";
If not, you have to do something evil:
$var =~ /^(($)|([^f].*)|(f[^o].*)|(fo[^o].*)|(foo.+))$/
or die "too much foo";
That one basically says "if it starts with non-f
, the rest can be anything; if it starts with f
, non-o
, the rest can be anything; otherwise, if it starts fo
, the next character had better not be another o
".
@Cort3z: if the problem is still present, this hotfix: https://support.microsoft.com/en-us/kb/2891362 should solve it (from win7 sp1 to 8.1)
Let me show you another way that works 100%. I will also add some padding for the example.
<div class = "container">
<div class = "flex-pad-x">
<div class = "flex-pad-y">
<div class = "flex-pad-y">
<div class = "flex-grow-y">
Content Centered
</div>
</div>
</div>
</div>
</div>
.container {
position: fixed;
top: 0px;
left: 0px;
bottom: 0px;
right: 0px;
width: 100%;
height: 100%;
}
.flex-pad-x {
padding: 0px 20px;
height: 100%;
display: flex;
}
.flex-pad-y {
padding: 20px 0px;
width: 100%;
display: flex;
flex-direction: column;
}
.flex-grow-y {
flex-grow: 1;
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
}
As you can see we can achieve this with a few wrappers for control while utilising the flex-grow & flex-direction attribute.
1: When the parent "flex-direction" is a "row", its child "flex-grow" works horizontally. 2: When the parent "flex-direction" is "columns", its child "flex-grow" works vertically.
Hope this helps
Daniel
Take an array containing months name.
String[] str = {"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"};
Then where you wanna take month use like follow:
if(i<str.length)
monthString = str[i-1];
else
monthString = "Invalid month";
If your functions are mainly doing I/O work (and less CPU work) and you have Python 3.2+, you can use a ThreadPoolExecutor:
from concurrent.futures import ThreadPoolExecutor
def run_io_tasks_in_parallel(tasks):
with ThreadPoolExecutor() as executor:
running_tasks = [executor.submit(task) for task in tasks]
for running_task in running_tasks:
running_task.result()
run_io_tasks_in_parallel([
lambda: print('IO task 1 running!'),
lambda: print('IO task 2 running!'),
])
If your functions are mainly doing CPU work (and less I/O work) and you have Python 2.6+, you can use the multiprocessing module:
from multiprocessing import Process
def run_cpu_tasks_in_parallel(tasks):
running_tasks = [Process(target=task) for task in tasks]
for running_task in running_tasks:
running_task.start()
for running_task in running_tasks:
running_task.join()
run_cpu_tasks_in_parallel([
lambda: print('CPU task 1 running!'),
lambda: print('CPU task 2 running!'),
])
Recent versions of bash
don't require call to the external program date
:
printf -v timestamp '%(%T)T'
%(...)T
uses the corresponding argument as a UNIX timestamp, and formats it according to the strftime
-style format between the parentheses. An argument of -1
corresponds to the current time, and when no ambiguity would occur can be omitted.
I just had this issue from a namespace mismatch. My XAML file was getting ported over and it had a different namespace from that in the code behind file.
Best way to locate anchor elements is to use link=Re-Call
:
selenium.click("link=Re-Call");
It will work..
From Laravel 5.6 you can use whereDate:
$users = Users::where('status_id', 'active')
->whereDate( 'created_at', '>', now()->subDays(30))
->get();
You also have whereMonth / whereDay / whereYear / whereTime
$('div#someDiv').css('height', '');
As the thread mentioned in the comment, get-command
in powershell can also work it out. For example, you can type get-command npm
and the output is as below:
This behavior is explicitly documented in String.split(String regex)
(emphasis mine):
This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array.
If you want those trailing empty strings included, you need to use String.split(String regex, int limit)
with a negative value for the second parameter (limit
):
String[] array = values.split("\\|", -1);
a.button a:hover
means "a link that's being hovered over that is a child of a link with the class button
".
Go instead for a.button:hover
.
place something like this in your script file json-content.js
var mainjson = { your json data}
then call it from script tag
<script src="json-content.js"></script>
then you can use it in next script
<script>
console.log(mainjson)
</script>
Instead of using the dumpin.exe it is possible to call the link.exe with several options:
Example: link /dump /all myfile.lib
For detailed options see output of link /dump
In case of Visual Studio C++ Express installation, the link.exe is located here:
{root}\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\
The best way is to open the "Visual Studio Command Prompt" and then enter the lines above.
var fd = new FormData();
fd.append('file', file);
$http.post(uploadUrl, fd, {
transformRequest: angular.identity,
headers: {'Content-Type': undefined}
})
.success(function(){
})
.error(function(){
});
Please checkout! https://uncorkedstudios.com/blog/multipartformdata-file-upload-with-angularjs
HTML5 comes with File API spec, which allows you to create applications that let the user interact with files locally; That means you can load files and render them in the browser without actually having to upload the files. Part of the File API is the FileReader interface which lets web applications asynchronously read the contents of files .
Here's a quick example that makes use of the FileReader
class to read an image as DataURL and renders a thumbnail by setting the src
attribute of an image tag to a data URL:
The html code:
<input type="file" id="files" />
<img id="image" />
The JavaScript code:
document.getElementById("files").onchange = function () {
var reader = new FileReader();
reader.onload = function (e) {
// get loaded data and render thumbnail.
document.getElementById("image").src = e.target.result;
};
// read the image file as a data URL.
reader.readAsDataURL(this.files[0]);
};
Here's a good article on using the File APIs in JavaScript.
The code snippet in the HTML example below filters out images from the user's selection and renders selected files into multiple thumbnail previews:
function handleFileSelect(evt) {_x000D_
var files = evt.target.files;_x000D_
_x000D_
// Loop through the FileList and render image files as thumbnails._x000D_
for (var i = 0, f; f = files[i]; i++) {_x000D_
_x000D_
// Only process image files._x000D_
if (!f.type.match('image.*')) {_x000D_
continue;_x000D_
}_x000D_
_x000D_
var reader = new FileReader();_x000D_
_x000D_
// Closure to capture the file information._x000D_
reader.onload = (function(theFile) {_x000D_
return function(e) {_x000D_
// Render thumbnail._x000D_
var span = document.createElement('span');_x000D_
span.innerHTML = _x000D_
[_x000D_
'<img style="height: 75px; border: 1px solid #000; margin: 5px" src="', _x000D_
e.target.result,_x000D_
'" title="', escape(theFile.name), _x000D_
'"/>'_x000D_
].join('');_x000D_
_x000D_
document.getElementById('list').insertBefore(span, null);_x000D_
};_x000D_
})(f);_x000D_
_x000D_
// Read in the image file as a data URL._x000D_
reader.readAsDataURL(f);_x000D_
}_x000D_
}_x000D_
_x000D_
document.getElementById('files').addEventListener('change', handleFileSelect, false);
_x000D_
<input type="file" id="files" multiple />_x000D_
<output id="list"></output>
_x000D_
Are you mixing C and C++? One issue that can occur is that the declarations in the .h
file for a .c
file need to be surrounded by:
#if defined(__cplusplus)
extern "C" { // Make sure we have C-declarations in C++ programs
#endif
and:
#if defined(__cplusplus)
}
#endif
Note: if unable / unwilling to modify the .h
file(s) in question, you can surround their inclusion with extern "C"
:
extern "C" {
#include <abc.h>
} //extern
One thing to keep in mind is :
The name 'ReentrantLock' gives out a wrong message about other locking mechanism that they are not re-entrant. This is not true. Lock acquired via 'synchronized' is also re-entrant in Java.
Key difference is that 'synchronized' uses intrinsic lock ( one that every Object has ) while Lock API doesn't.
This is an addition to dmd733's answer. I fixed the bug with Day duration (well I hope I did, haven't been able to test every case).
I also quickly added a String property to the result that holds the general time passed (sorry for the bad nested ifs!!). For example if used for UI and indicating when something was updated (like a RSS feed). Kind of out of place but nice-to-have:
function getTimeDiffAndPrettyText(oDatePublished) {
var oResult = {};
var oToday = new Date();
var nDiff = oToday.getTime() - oDatePublished.getTime();
// Get diff in days
oResult.days = Math.floor(nDiff / 1000 / 60 / 60 / 24);
nDiff -= oResult.days * 1000 * 60 * 60 * 24;
// Get diff in hours
oResult.hours = Math.floor(nDiff / 1000 / 60 / 60);
nDiff -= oResult.hours * 1000 * 60 * 60;
// Get diff in minutes
oResult.minutes = Math.floor(nDiff / 1000 / 60);
nDiff -= oResult.minutes * 1000 * 60;
// Get diff in seconds
oResult.seconds = Math.floor(nDiff / 1000);
// Render the diffs into friendly duration string
// Days
var sDays = '00';
if (oResult.days > 0) {
sDays = String(oResult.days);
}
if (sDays.length === 1) {
sDays = '0' + sDays;
}
// Format Hours
var sHour = '00';
if (oResult.hours > 0) {
sHour = String(oResult.hours);
}
if (sHour.length === 1) {
sHour = '0' + sHour;
}
// Format Minutes
var sMins = '00';
if (oResult.minutes > 0) {
sMins = String(oResult.minutes);
}
if (sMins.length === 1) {
sMins = '0' + sMins;
}
// Format Seconds
var sSecs = '00';
if (oResult.seconds > 0) {
sSecs = String(oResult.seconds);
}
if (sSecs.length === 1) {
sSecs = '0' + sSecs;
}
// Set Duration
var sDuration = sDays + ':' + sHour + ':' + sMins + ':' + sSecs;
oResult.duration = sDuration;
// Set friendly text for printing
if(oResult.days === 0) {
if(oResult.hours === 0) {
if(oResult.minutes === 0) {
var sSecHolder = oResult.seconds > 1 ? 'Seconds' : 'Second';
oResult.friendlyNiceText = oResult.seconds + ' ' + sSecHolder + ' ago';
} else {
var sMinutesHolder = oResult.minutes > 1 ? 'Minutes' : 'Minute';
oResult.friendlyNiceText = oResult.minutes + ' ' + sMinutesHolder + ' ago';
}
} else {
var sHourHolder = oResult.hours > 1 ? 'Hours' : 'Hour';
oResult.friendlyNiceText = oResult.hours + ' ' + sHourHolder + ' ago';
}
} else {
var sDayHolder = oResult.days > 1 ? 'Days' : 'Day';
oResult.friendlyNiceText = oResult.days + ' ' + sDayHolder + ' ago';
}
return oResult;
}
This only works on Windows, so if you are planning to use dotnet core cross-platform, you'll have to look elsewhere. See https://github.com/dotnet/corefx/blob/master/Documentation/architecture/cross-platform-cryptography.md
In my case the problem was I was trying to add same view multiple times to linear layout
View childView = LayoutInflater.from(context).inflate(R.layout.lay_progressheader, parentLayout,false);
for (int i = 1; i <= totalCount; i++) {
parentLayout.addView(childView);
}
just initialize view every time to fix the issue
for (int i = 1; i <= totalCount; i++) {
View childView = LayoutInflater.from(context).inflate(R.layout.lay_progressheader, parentLayout,false);
parentLayout.addView(childView);
}
Try to put the following to the ~/.gitconfig file:
[http]
proxy = http://proxy:8080
[https]
proxy = http://proxy:8080
[url "https://"]
insteadOf = git://
If checking for truth:
if foo
For false:
if not foo
For none:
if foo is None
For non-none:
if foo is not None
For getattr()
the correct behaviour is not to return None
, but raise an AttributError
error instead - unless your class is something like defaultdict
.
You can't. Variables defined inside a method are local to that method.
If you want to share variables between methods, then you'll need to specify them as member variables of the class. Alternatively, you can pass them from one method to another as arguments (this isn't always applicable).
Looks like you're using instance methods instead of static ones.
If you don't want to create an object, you should declare all your methods static, so something like
private static void methodName(Argument args...)
If you want a variable to be accessible by all these methods, you should initialise it outside the methods and to limit its scope, declare it private.
private static int[][] array = new int[3][5];
Global variables are usually looked down upon (especially for situations like your one) because in a large-scale program they can wreak havoc, so making it private will prevent some problems at the least.
Also, I'll say the usual: You should try to keep your code a bit tidy. Use descriptive class, method and variable names and keep your code neat (with proper indentation, linebreaks etc.) and consistent.
Here's a final (shortened) example of what your code should be like:
public class Test3 {
//Use this array in your methods
private static int[][] scores = new int[3][5];
/* Rather than just "Scores" name it so people know what
* to expect
*/
private static void createScores() {
//Code...
}
//Other methods...
/* Since you're now using static methods, you don't
* have to initialise an object and call its methods.
*/
public static void main(String[] args){
createScores();
MD(); //Don't know what these do
sumD(); //so I'll leave them.
}
}
Ideally, since you're using an array, you would create the array in the main method and pass it as an argument across each method, but explaining how that works is probably a whole new question on its own so I'll leave it at that.
only variable/object declaration statement are written outside of method
public class details{
public static void main(String arg[]){
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("What is your name?");
String name = in.readLine(); ;
System.out.println("Hello " + name);
}
}
here is example try to learn java book and see the syntax then try to develop the program
Wrap your OutputStream with a PrintWriter and use the print methods on that class. They take in a String and do the work for you.
Another question elligeable for a 'code-challenge': here are some source code executables to answer the problem, but they are not complete.
Will you find a vb script that anyone can execute on his/her computer, with the expected result ?
systeminfo|find /i "original"
would give you the actual date... not the number of seconds ;)
As Sammy comments, find /i "install"
gives more than you need.
And this only works if the locale is English: It needs to match the language.
For Swedish this would be "ursprungligt
" and "ursprüngliches
" for German.
In Windows PowerShell script, you could just type:
PS > $os = get-wmiobject win32_operatingsystem
PS > $os.ConvertToDateTime($os.InstallDate) -f "MM/dd/yyyy"
By using WMI (Windows Management Instrumentation)
If you do not use WMI, you must read then convert the registry value:
PS > $path = 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion'
PS > $id = get-itemproperty -path $path -name InstallDate
PS > $d = get-date -year 1970 -month 1 -day 1 -hour 0 -minute 0 -second 0
## add to hours (GMT offset)
## to get the timezone offset programatically:
## get-date -f zz
PS > ($d.AddSeconds($id.InstallDate)).ToLocalTime().AddHours((get-date -f zz)) -f "MM/dd/yyyy"
The rest of this post gives you other ways to access that same information. Pick your poison ;)
In VB.Net that would give something like:
Dim dtmInstallDate As DateTime
Dim oSearcher As New ManagementObjectSearcher("SELECT * FROM Win32_OperatingSystem")
For Each oMgmtObj As ManagementObject In oSearcher.Get
dtmInstallDate =
ManagementDateTimeConverter.ToDateTime(CStr(oMgmtO bj("InstallDate")))
Next
In Autoit (a Windows scripting language), that would be:
;Windows Install Date
;
$readreg = RegRead("HKLM\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\", "InstallDate")
$sNewDate = _DateAdd( 's',$readreg, "1970/01/01 00:00:00")
MsgBox( 4096, "", "Date: " & $sNewDate )
Exit
In Delphy 7, that would go as:
Function GetInstallDate: String;
Var
di: longint;
buf: Array [ 0..3 ] Of byte;
Begin
Result := 'Unknown';
With TRegistry.Create Do
Begin
RootKey := HKEY_LOCAL_MACHINE;
LazyWrite := True;
OpenKey ( '\SOFTWARE\Microsoft\Windows NT\CurrentVersion', False );
di := readbinarydata ( 'InstallDate', buf, sizeof ( buf ) );
// Result := DateTimeToStr ( FileDateToDateTime ( buf [ 0 ] + buf [ 1 ] * 256 + buf [ 2 ] * 65535 + buf [ 3 ] * 16777216 ) );
showMessage(inttostr(di));
Free;
End;
End;
As an alternative, CoastN proposes in the comments:
As the
system.ini-file
stays untouched in a typical windows deployment, you can actually get the install-date by using the following oneliner:(PowerShell): (Get-Item "C:\Windows\system.ini").CreationTime
In a node.js server console.log
outputs to the terminal window, not to the browser's console window.
How are you running your server? You should see the output directly after you start it.
I've been using Chilkat's native SFTP library ( http://www.chilkatsoft.com/ssh-sftp-component.asp ) for a couple of months now and it's working great. Been using it in a nightly job to download large files and do private key authentication. Only problem that I had was getting the 64bit version to work on windows server 2008, I needed to install vcredist_x64.exe ( http://www.microsoft.com/download/en/details.aspx?id=14632 ) on my server.
Works fine for me
See example here. http://jsfiddle.net/blowsie/c6VAy/
Make sure your jquery is inside $(document).ready
function or similar.
Also you can improve your code by using jquery data
$('#amount').data('min','1000');
<div id="amount" data-min=""></div>
Update,
A working example of your full code (pretty much) here. http://jsfiddle.net/blowsie/c6VAy/3/
Where does pip installations happen in python?
I will give a windows solution which I was facing and took a while to solve.
First of all, in windows (I will be taking Windows as the OS here), if you do pip install <package_name>
, it will be by default installed globally (if you have not activated a virtual enviroment).
Once you activate a virtual enviroment and you are inside it, all pip installations will be inside that virtual enviroment.
pip is installing the said packages but not I cannot use them?
For this pip might be giving you a warning that the pip executables like pip3.exe
, pip.exe
are not on your path variable.
For this you might add this path ( usually - C:\Users\<your_username>\AppData\Roaming\Programs\Python\
) to your enviromental variables.
After this restart your cmd
, and now try to use your installed python package. It should work now.
Better answer will be
git config push.default current
upsteam
works but when you have no branch on origin
then you will need to set the upstream branch. Changing it to current
will automatically set the upsteam branch and will push the branch immediately.
here is a ruby implementation:
It will catalog by attribute name or the result of a method call.
CatalogGenerator = ->(depth) do
if depth != 0
->(hash, key) do
hash[key] = Hash.new(&CatalogGenerator[depth - 1])
end
else
->(hash, key) do
hash[key] = []
end
end
end
def catalog(collection, root_name: :root, by:)
method_names = [*by]
log = Hash.new(&CatalogGenerator[method_names.length])
tree = collection.each_with_object(log) do |item, catalog|
path = method_names.map { |method_name| item.public_send(method_name)}.unshift(root_name.to_sym)
catalog.dig(*path) << item
end
tree.with_indifferent_access
end
students = [#<Student:0x007f891d0b4818 id: 33999, status: "on_hold", tenant_id: 95>,
#<Student:0x007f891d0b4570 id: 7635, status: "on_hold", tenant_id: 6>,
#<Student:0x007f891d0b42c8 id: 37220, status: "on_hold", tenant_id: 6>,
#<Student:0x007f891d0b4020 id: 3444, status: "ready_for_match", tenant_id: 15>,
#<Student:0x007f8931d5ab58 id: 25166, status: "in_partnership", tenant_id: 10>]
catalog students, by: [:tenant_id, :status]
# this would out put the following
{"root"=>
{95=>
{"on_hold"=>
[#<Student:0x007f891d0b4818
id: 33999,
status: "on_hold",
tenant_id: 95>]},
6=>
{"on_hold"=>
[#<Student:0x007f891d0b4570 id: 7635, status: "on_hold", tenant_id: 6>,
#<Student:0x007f891d0b42c8
id: 37220,
status: "on_hold",
tenant_id: 6>]},
15=>
{"ready_for_match"=>
[#<Student:0x007f891d0b4020
id: 3444,
status: "ready_for_match",
tenant_id: 15>]},
10=>
{"in_partnership"=>
[#<Student:0x007f8931d5ab58
id: 25166,
status: "in_partnership",
tenant_id: 10>]}}}
First of all, the easiest way to run things at startup is to add them to the file /etc/rc.local
.
Another simple way is to use @reboot
in your crontab. Read the cron manpage for details.
However, if you want to do things properly, in addition to adding a script to /etc/init.d
you need to tell ubuntu when the script should be run and with what parameters. This is done with the command update-rc.d
which creates a symlink from some of the /etc/rc*
directories to your script. So, you'd need to do something like:
update-rc.d yourscriptname start 2
However, real init scripts should be able to handle a variety of command line options and otherwise integrate to the startup process. The file /etc/init.d/README
has some details and further pointers.
Check the format of the video you are rendering. Rendering of mp4 format started from API level 11 and the format must be mp4(H.264)
I encountered the same problem, I had to convert my video to many formats before I hit the format: Use total video converter to convert the video to mp4. It works like a charm.
use plt.figure(dpi=1200)
before all your plt.plot...
and at the end use plt.savefig(...
see: http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.figure
and
http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.savefig
There are many ways to speed up Android Studio.
Speed up gradle build time.
1.Go to Project gradle.properties file and remove comment from both line.
2.copy gradle.properties file to your .gradle folder so that you don't need to setup for every project.
Enable Work Offline so that Android studio/Gradle don't need to check for newer file over internet every time.
Use ngStorage
For All Your AngularJS Local Storage Needs. Please note that this is NOT a native part of the Angular JS framework.
ngStorage
contains two services, $localStorage
and $sessionStorage
angular.module('app', [
'ngStorage'
]).controller('Ctrl', function(
$scope,
$localStorage,
$sessionStorage
){});
Check the Demo
Case sensitive Tables (table names created with double-quotes) can throw this same error as well. See this answer for more information.
Simply wrap the table in double quotes:
INSERT INTO "customer" (c_id,name,surname) VALUES ('1','Micheal','Jackson')
I don't believe there is a way to specify the schema in the connection string. It appears you have to execute
set search_path to 'schema'
after the connection is made to specify the schema.
Right click your project in eclipse, build path -> add external jars.
My answer
/**
* Display form to reply comment
*/
function displayReplyForm(commentId) {
var replyForm = $('#reply-form-' + commentId);
if (replyForm.css('display') == 'block') { // Current display
replyForm.css('display', 'none');
} else { // Hide reply form
replyForm.css('display', 'block');
}
}
Centerlized Model: You can use it from any where!
You just need to call Below Format From your function to this class
DataSet ds = new DataSet();
SqlParameter[] p = new SqlParameter[1];
string Query = "Describe Query Information/either sp, text or TableDirect";
DbConnectionHelper dbh = new DbConnectionHelper ();
ds = dbh. DBConnection("Here you use your Table Name", p , string Query, CommandType.StoredProcedure);
That's it. it's perfect method.
public class DbConnectionHelper {
public DataSet DBConnection(string TableName, SqlParameter[] p, string Query, CommandType cmdText) {
string connString = @ "your connection string here";
//Object Declaration
DataSet ds = new DataSet();
SqlConnection con = new SqlConnection();
SqlCommand cmd = new SqlCommand();
SqlDataAdapter sda = new SqlDataAdapter();
try {
//Get Connection string and Make Connection
con.ConnectionString = connString; //Get the Connection String
if (con.State == ConnectionState.Closed) {
con.Open(); //Connection Open
}
if (cmdText == CommandType.StoredProcedure) //Type : Stored Procedure
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = Query;
if (p.Length > 0) // If Any parameter is there means, we need to add.
{
for (int i = 0; i < p.Length; i++) {
cmd.Parameters.Add(p[i]);
}
}
}
if (cmdText == CommandType.Text) // Type : Text
{
cmd.CommandType = CommandType.Text;
cmd.CommandText = Query;
}
if (cmdText == CommandType.TableDirect) //Type: Table Direct
{
cmd.CommandType = CommandType.Text;
cmd.CommandText = Query;
}
cmd.Connection = con; //Get Connection in Command
sda.SelectCommand = cmd; // Select Command From Command to SqlDataAdaptor
sda.Fill(ds, TableName); // Execute Query and Get Result into DataSet
con.Close(); //Connection Close
} catch (Exception ex) {
throw ex; //Here you need to handle Exception
}
return ds;
}
}
The best way seems to put the final state at the main part of css. Like here, i put width to 220px
, so that it finally becomes 220px
. But starting to 0px;
div.menu-item1 {
font-size: 20px;
border: 2px solid #fff;
width: 220px;
animation: slide 1s;
-webkit-animation: slide 1s; /* Safari and Chrome */
}
@-webkit-keyframes slide { /* Safari and Chrome */
from {width:0px;}
to {width:220px;}
}
First of all, I suggest to modify a bit your sql query:
select * from shift
where shift.shiftid not in (select employeeshift.shiftid from employeeshift
where employeeshift.empid = 57);
This query provides same functionality. If you want to get the same result with LINQ, you can try this code:
//Variable dc has DataContext type here
//Here we get list of ShiftIDs from employeeshift table
List<int> empShiftIds = dc.employeeshift.Where(p => p.EmpID = 57).Select(s => s.ShiftID).ToList();
//Here we get the list of our shifts
List<shift> shifts = dc.shift.Where(p => !empShiftIds.Contains(p.ShiftId)).ToList();
i just change gradle version classpath 'com.android.tools.build:gradle:3.5.3'
to
classpath 'com.android.tools.build:gradle:3.3.2'
and now working.
You can use MATLAB-style tic
-toc
functions, if you prefer. See this other SO question
You have to validate the connection.
If you use Oracle it is likely that you use Oracle´s Universal Connection Pool. The following assumes that you do so.
The easiest way to validate the connection is to tell Oracle that the connection must be validated while borrowing it. This can be done with
pool.setValidateConnectionOnBorrow(true);
But it works only if you hold the connection for a short period. If you borrow the connection for a longer time, it is likely that the connection gets broken while you hold it. In that case you have to validate the connection explicitly with
if (connection == null || !((ValidConnection) connection).isValid())
See the Oracle documentation for further details.
Try this:
counter=0
while true; do
if /home/hadoop/latest/bin/hadoop fs -ls /apps/hdtech/bds/quality-rt/dt=$DATE_YEST_FORMAT2 then
echo "Files Present" | mailx -s "File Present" -r [email protected] [email protected]
break
elif [[ "$counter" -gt 20 ]]; then
echo "Counter limit reached, exit script."
exit 1
else
let counter++
echo "Sleeping for another half an hour" | mailx -s "Time to Sleep Now" -r [email protected] [email protected]
sleep 1800
fi
done
Explanation
break
- if files are present, it will break and allow the script to process the files.[[ "$counter" -gt 20 ]]
- if the counter variable is greater than 20, the script will exit.let counter++
- increments the counter by 1 at each pass.export
is a command that you give directly to the shell (e.g. bash
), to tell it to add or modify one of its environment variables. You can't change your shell's environment from a child process (such as Python), it's just not possible.
Here's what's happening when you try os.system('export MY_DATA="my_export"')
...
/bin/bash process, command `python yourscript.py` forks python subprocess
|_
/usr/bin/python process, command `os.system()` forks /bin/sh subprocess
|_
/bin/sh process, command `export ...` changes its local environment
When the bottom-most /bin/sh
subprocess finishes running your export ...
command, then it's discarded, along with the environment that you have just changed.
Try to put your data in a file, say body.json
and then use
curl -H "Content-Type: application/json" --data @body.json http://localhost:8080/ui/webapp/conf
First off I should point out that css animations would probably work best if you are doing this a lot but I ended getting the desired effect by wrapping .scrollLeft inside .animate
$('.swipeRight').click(function()
{
$('.swipeBox').animate( { scrollLeft: '+=460' }, 1000);
});
$('.swipeLeft').click(function()
{
$('.swipeBox').animate( { scrollLeft: '-=460' }, 1000);
});
The second parameter is speed, and you can also add a third parameter if you are using smooth scrolling of some sort.
A small update for the new Skype options window. Please follow this:
Go to Tools ? Options ? Advanced ? Connection
and uncheck the box use port 80 and 443 as alternatives for incoming connections
.
Linus is spot on in the approach, but a few properties are off. It looks like 'AgencyContractId' is your Primary Key, which is unrelated to the output you want to give the user. I think this is what you want (assuming you change your ViewModel to match the data you say you want in your view).
var agencyContracts = _agencyContractsRepository.AgencyContracts
.GroupBy(ac => new
{
ac.AgencyID,
ac.VendorID,
ac.RegionID
})
.Select(ac => new AgencyContractViewModel
{
AgencyId = ac.Key.AgencyID,
VendorId = ac.Key.VendorID,
RegionId = ac.Key.RegionID,
Total = ac.Sum(acs => acs.Amount) + ac.Sum(acs => acs.Fee)
});
This is how you get unique from an array with two or more properties. The sort is vital and the key to getting it to work correctly. Otherwise you just get one item returned.
PowerShell Script:
$objects = @(
[PSCustomObject] @{ Message = "1"; MachineName = "1" }
[PSCustomObject] @{ Message = "2"; MachineName = "1" }
[PSCustomObject] @{ Message = "3"; MachineName = "1" }
[PSCustomObject] @{ Message = "4"; MachineName = "1" }
[PSCustomObject] @{ Message = "5"; MachineName = "1" }
[PSCustomObject] @{ Message = "1"; MachineName = "2" }
[PSCustomObject] @{ Message = "2"; MachineName = "2" }
[PSCustomObject] @{ Message = "3"; MachineName = "2" }
[PSCustomObject] @{ Message = "4"; MachineName = "2" }
[PSCustomObject] @{ Message = "5"; MachineName = "2" }
[PSCustomObject] @{ Message = "1"; MachineName = "1" }
[PSCustomObject] @{ Message = "2"; MachineName = "1" }
[PSCustomObject] @{ Message = "3"; MachineName = "1" }
[PSCustomObject] @{ Message = "4"; MachineName = "1" }
[PSCustomObject] @{ Message = "5"; MachineName = "1" }
[PSCustomObject] @{ Message = "1"; MachineName = "2" }
[PSCustomObject] @{ Message = "2"; MachineName = "2" }
[PSCustomObject] @{ Message = "3"; MachineName = "2" }
[PSCustomObject] @{ Message = "4"; MachineName = "2" }
[PSCustomObject] @{ Message = "5"; MachineName = "2" }
)
Write-Host "Sorted on both properties with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property Message,MachineName -Unique | Out-Host
Write-Host "Sorted on just Message with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property Message -Unique | Out-Host
Write-Host "Sorted on just MachineName with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property MachineName -Unique | Out-Host
Output:
Sorted on both properties with -Unique
Message MachineName
------- -----------
1 1
1 2
2 1
2 2
3 1
3 2
4 1
4 2
5 1
5 2
Sorted on just Message with -Unique
Message MachineName
------- -----------
1 1
2 1
3 1
4 1
5 2
Sorted on just MachineName with -Unique
Message MachineName
------- -----------
1 1
3 2
Source: https://powershell.org/forums/topic/need-to-unique-based-on-multiple-properties/
For MacOs Catalina users with ZSH Shell.
The following procedure fixes the "command not found: flutter".
Open your terminal, go to your home directory and type the following command:
export PATH ="/YourHomeDirectory/YourUsername/YourDirectory/flutter/bin:$PATH"
Check the version of Flutter you have, write the following command:
flutter --version
Dart and some tools will be downloaded. After a few minutes, you will be ready to work.
If you use zsh shell instead of Bash shell, you must edit the .zshrc file (it is located in your home directory) and write the following command at the end:
export PATH="/YourHomeDirectory/YourUsername/YourDirectory/flutter/bin:$ PATH"
This will make the change permanent, if you don't edit the .zshrc file the change will be lost when closing the terminal window.
Do you want to print the date in that format? This is the Python documentation: http://docs.python.org/2/library/datetime.html#strftime-strptime-behavior
>>> a = datetime.datetime(2013, 1, 7, 10, 31, 34, 243366)
>>> print a.strftime('%Y %d %B, %M:%S%p')
>>> 2013 07 January, 31:34AM
For the timedelta:
>>> a = datetime.timedelta(0,5,41038)
>>> print '%s seconds, %s microseconds' % (a.seconds, a.microseconds)
But please notice, you should make sure it has the related value. For the above cases, it doesn't have the hours and minute values, and you should calculate from the seconds.
using ssh from java should not be as hard as jsch makes it. you might be better off with sshj.
I did
msgbox "TEXT HERE",3,"TITLE HERE"
If Yes=true then
(result)
else
msgbox "Closing..."
You could use toArray() to convert into an array of Objects followed by this method to convert the array of Objects into an array of Strings:
Object[] objectArray = lst.toArray();
String[] stringArray = Arrays.copyOf(objectArray, objectArray.length, String[].class);
for this question we can also use this method :
Question from sql zoo:
Find all details of the prize won by PETER GRÜNBERG
Non-ASCII characters
ans: select*from nobel where winner like'P% GR%_%berg';
It's a horribly obscure way to do a type conversion.
!
is NOT. So !true
is false
, and !false
is true
. !0
is true
, and !1
is false
.
So you're converting a value to a boolean, then inverting it, then inverting it again.
// Maximum Obscurity:
val.enabled = !!userId;
// Partial Obscurity:
val.enabled = (userId != 0) ? true : false;
// And finally, much easier to understand:
val.enabled = (userId != 0);
public static bool ContainsAny(this string haystack, IEnumerable<string> needles)
{
return needles.Any(haystack.Contains);
}
Swift 3 For check Empty String best way
if !string.isEmpty{
// do stuff
}
Simply use the delegate approach.
int val;
Thread thread = new Thread(() => { val = Multiply(1, 2); });
thread.Start();
Now make Multiply function that will work on another thread:
int Multiply(int x, int y)
{
return x * y;
}
This is an old question. But if you're using a virtualenv with python, place the contents of the downloaded libav bin
folder in the Scripts
folder of your virtualenv.
select *
from tempdb.INFORMATION_SCHEMA.COLUMNS
where TABLE_NAME=OBJECT_NAME(OBJECT_ID('#table'))
They are as they were. That one key is JUST DELETED
Here is what worked for me.
Get the container ID and restart.
docker ps -a --no-trunc
ace7ca65e6e3fdb678d9cdfb33a7a165c510e65c3bc28fecb960ac993c37ef33
docker restart ace7ca65e6e3fdb678d9cdfb33a7a165c510e65c3bc28fecb960ac993c37ef33
Max length will not work with <input type="number"
the best way i know is to use oninput
event to limit the maxlength. Please see the below code.
<input name="somename"
oninput="javascript: if (this.value.length > this.maxLength) this.value = this.value.slice(0, this.maxLength);"
type = "number"
maxlength = "6"
/>
For Ubuntu 16.04:
How to disable strict mode in MySQL 5.7:
Edit file /etc/mysql/mysql.conf.d/mysqld.cnf
If below line exists in mysql.cnf
sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
Then Replace it with
sql_mode='MYSQL40'
Otherwise
Just add below line in mysqld.cnf
sql_mode='MYSQL40'
This resolved problem.
This will ensure all WEB-INF/lib jars are included on the classpath.
Solved using JavaScript + jQuery! I just need similar solution to my project but current solution with HTML and CSS is not ok for me because there is issue with column height + I need more then one column to be fixed. So I create simple javascript solution using jQuery
You can try it here https://jsfiddle.net/kindrosker/ffwqvntj/
All you need is setup home many columsn will be fixed in data-count-fixed-columns parameter
<table class="table" data-count-fixed-columns="2" cellpadding="0" cellspacing="0">
and run js function
app_handle_listing_horisontal_scroll($('#table-listing'))
Am I missing something in the question or why else nobody mentioned reviver
parameter of JSON.parse
since 2011?
Here is simplistic code for solution that works: https://jsfiddle.net/Ldr2utrr/
function Foo()
{
this.a = 3;
this.b = 2;
this.test = function() {return this.a*this.b;};
}
var fooObj = new Foo();
alert(fooObj.test() ); //Prints 6
var fooJSON = JSON.parse(`{"a":4, "b": 3}`, function(key,value){
if(key!=="") return value; //logic of course should be more complex for handling nested objects etc.
let res = new Foo();
res.a = value.a;
res.b = value.b;
return res;
});
// Here you already get Foo object back
alert(fooJSON.test() ); //Prints 12
PS: Your question is confusing: >>That's great, but how can I take that JavaScript Object and turn it into a particular JavaScript Object (i.e. with a certain prototype)? contradicts to the title, where you ask about JSON parsing, but the quoted paragraph asks about JS runtime object prototype replacement.
I'm on lubuntu 19.10
I've used combination of previous answers, and didn't tweak the $PATH
.
npm uninstall --global gulp gulp-cli
This removes any package if they are already there.sudo npm install --global gulp-cli
Reinstall it as root user.If you want to do copy and paste
npm uninstall --global gulp gulp-cli && sudo npm install --global gulp-cli
should work
I guess --global
is unnecessary here as it's installed using sudo
, but I've used it just in case.
So apparently, all I needed was the "build-essential" package, then to run autoconf
first, which made the Makefile.pre.in
, then the ./configure
then the make
which works perfectly...
@robert-hurst has a cleaner approach.
However, this solution may also be used, in places when you actually want to have a copy of Data Url after copying. For example, when you are building a website that uses lots of image/canvas operations.
// select canvas elements
var sourceCanvas = document.getElementById("some-unique-id");
var destCanvas = document.getElementsByClassName("some-class-selector")[0];
//copy canvas by DataUrl
var sourceImageData = sourceCanvas.toDataURL("image/png");
var destCanvasContext = destCanvas.getContext('2d');
var destinationImage = new Image;
destinationImage.onload = function(){
destCanvasContext.drawImage(destinationImage,0,0);
};
destinationImage.src = sourceImageData;
Fragments can be added inside other fragments but then you will need to remove it from parent Fragment each time when onDestroyView()
method of parent fragment is called. And again add it in Parent Fragment's onCreateView()
method.
Just do like this :
@Override
public void onDestroyView()
{
FragmentManager mFragmentMgr= getFragmentManager();
FragmentTransaction mTransaction = mFragmentMgr.beginTransaction();
Fragment childFragment =mFragmentMgr.findFragmentByTag("qa_fragment")
mTransaction.remove(childFragment);
mTransaction.commit();
super.onDestroyView();
}
Here's how I solved that problem:
int pHeight = picture.getHeight();
int pWidth = picture.getWidth();
int vWidth = preview.getWidth();
preview.getLayoutParams().height = (int)(vWidth*((double)pHeight/pWidth));
preview - imageView with width setted to "match_parent" and scaleType to "cropCenter"
picture - Bitmap object to set in imageView src.
That's works pretty well for me.
'sender' is called object which has some action perform on some control
'event' its having some information about control which has some behavoiur and identity perform by some user.when action will generate by occuring for event add it keep within array is called event agrs
a = (b = 'string is truthy'); // b gets string; a gets b, which is a primitive (copy)
a = (b = { c: 'yes' }); // they point to the same object; a === b (not a copy)
(a && b)
is logically (a ? b : a)
and behaves like multiplication (eg. !!a * !!b
)
(a || b)
is logically (a ? a : b)
and behaves like addition (eg. !!a + !!b
)
(a = 0, b)
is short for not caring if a
is truthy, implicitly return b
a = (b = 0) && "nope, but a is 0 and b is 0"; // b is falsey + order of operations
a = (b = "b is this string") && "a gets this string"; // b is truthy + order of ops
JavaScript Operator Precedence (Order of Operations)
Note that the comma operator is actually the least privileged operator, but parenthesis are the most privileged, and they go hand-in-hand when constructing one-line expressions.
Eventually, you may need 'thunks' rather than hardcoded values, and to me, a thunk is both the function and the resultant value (the same 'thing').
const windowInnerHeight = () => 0.8 * window.innerHeight; // a thunk
windowInnerHeight(); // a thunk
Thread.sleep can throw an InterruptedException which is a checked exception. All checked exceptions must either be caught and handled or else you must declare that your method can throw it. You need to do this whether or not the exception actually will be thrown. Not declaring a checked exception that your method can throw is a compile error.
You either need to catch it:
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
// handle the exception...
// For example consider calling Thread.currentThread().interrupt(); here.
}
Or declare that your method can throw an InterruptedException
:
public static void main(String[]args) throws InterruptedException
Related
If you only need to look at the cells that are in use you can use:
sub IterateCells()
For Each Cell in ActiveSheet.UsedRange.Cells
'do some stuff
Next
End Sub
that will hit everything in the range from A1 to the last cell with data (the bottom right-most cell)
I understand this has been marked as answered but I ran into a bit of a problem when I was working on a project where I have my EF Core Data Access Layer in a .DLL Project separated from the rest of my project, API, Auth and Web and mostly will like my other projects to reference this Data project. And I don't want to want to come into the Data project to change connection strings everytime.
STEP 1: Include this in the OnConfiguring Method
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
var envName = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
IConfigurationRoot configuration = new ConfigurationBuilder()
**.SetBasePath(Path.Combine(Directory.GetCurrentDirectory()))**
.AddJsonFile("appsettings.json", optional: false)
.AddJsonFile($"appsettings.{envName}.json", optional: false)
.Build();
optionsBuilder.UseSqlServer(configuration.GetConnectionString("DefaultConnection"));
}
NOTE: .SetBasePath(Path.Combine(Directory.GetCurrentDirectory())) This will negate or invalidate the need to copy the file to a directory as ASP.NET CORE is smart enough to pick the the right file. Also the environment specified will pick right file when the building for Release or Production, assuming the Prod environment file is selected.
STEP 2: Create appsettings.json
{
"ConnectionStrings": {
"DefaultConnection": "Server=YOURSERVERNAME; Database=YOURDATABASENAME; Trusted_Connection=True; MultipleActiveResultSets=true"
}
}
PLEASE: Referece: Microsoft.Extensions.Configuration
If you get this compilation error, it means that you have not included the servlet jar in the classpath. The correct way to include this jar is to add the Server Runtime jar to your eclipse project. You should follow the steps below to address this issue: You can download the servlet-api.jar from here http://www.java2s.com/Code/Jar/s/Downloadservletapijar.htm
Save it in directory. Right click on project -> go to properties->Buildpath and follow the steps.
_x000D_
Note: The jar which are shown in the screen are not correct jar.
you can follow the step to configure.
Check if you have Chrome App Launcher. You can usually see it in your toolbar. It runs as a second instance of chrome, but unlike the browser, it auto-runs so is going to be running whenever you start your PC. Even though it isn't a browser view, it is a chrome instance which is enough to prevent your arguments from taking effect. Go to your task manager and you will probably have to kill 2 chrome processes.
Wanted to comment on the last answer, but without login it’s only possible to make an answer:
To get rid of the "read only error" just stop the device immediately after it’s ready. My script looks as follows:
#!/bin/bash
~/bin/AndroidSdk/tools/emulator @Nexus_6P_API_23 -no-boot-anim &
adb wait-for-device
adb shell stop
adb remount
adb push GmsCore.apk /system/priv-app
adb push GoogleServicesFramework.apk /system/priv-app
adb push GoogleLoginService.apk /system/priv-app
adb push Phonesky.apk /system/priv-app
adb shell start
Found successful workaround that is applicable for my scenario:
Don't log off, just lock the session!
Since this script is running on a Domain Controller, I am logging in to the server via the Remote Desktop console and then log off of the server to terminate my session. When setting up the Task in the Task Scheduler, I was using user accounts and local services that did not have access to run in an offline mode, or logon strictly to run a script.
Thanks to some troubleshooting assistance from Cole, I got to thinking about the RunAs function and decided to try and work around the non-functioning logons.
Starting in the Task Scheduler, I deleted my manually created Tasks. Using the new function in Server 2008 R2, I navigated to a 4740 Security Event in the Event Viewer, and used the right-click > Attach Task to this Event... and followed the prompts, pointing to my script on the Action page. After the Task was created, I locked my session and terminated my Remote Desktop Console connection. WIth the profile 'Locked' and not logged off, everything works like it should.
Unfortunately, the answer to your question of whether there is official Material support for selecting the time is "No", but it's currently an open issue on the official Material2 GitHub repo: https://github.com/angular/material2/issues/5648
Hopefully this changes soon, in the mean time, you'll have to fight with the 3rd-party ones you've already discovered. There are a few people in that GitHub issue that provide their self-made workarounds that you can try.
From https://idlebox.net/2010/apidocs/gdb-7.0.zip/gdb_9.html
The values of arguments that were not saved in their stack frames are shown as `value optimized out'.
Im guessing you compiled with -O(somevalue) and are accessing variables a,b,c in a function where optimization has occurred.
There is another way to have multiple dataSources by using @EnableAutoConfiguration and application.properties.
Basically put multiple dataSource configuration info on application.properties and generate default setup (dataSource and entityManagerFactory) automatically for first dataSource by @EnableAutoConfiguration. But for next dataSource, create dataSource, entityManagerFactory and transactionManager all manually by the info from property file.
Below is my example to setup two dataSources. First dataSource is setup by @EnableAutoConfiguration which can be assigned only for one configuration, not multiple. And that will generate 'transactionManager' by DataSourceTransactionManager, that looks default transactionManager generated by the annotation. However I have seen the transaction not beginning issue on the thread from scheduled thread pool only for the default DataSourceTransactionManager and also when there are multiple transaction managers. So I create transactionManager manually by JpaTransactionManager also for the first dataSource with assigning 'transactionManager' bean name and default entityManagerFactory. That JpaTransactionManager for first dataSource surely resolves the weird transaction issue on the thread from ScheduledThreadPool.
Update for Spring Boot 1.3.0.RELEASE
I found my previous configuration with @EnableAutoConfiguration for default dataSource has issue on finding entityManagerFactory with Spring Boot 1.3 version. Maybe default entityManagerFactory is not generated by @EnableAutoConfiguration, once after I introduce my own transactionManager. So now I create entityManagerFactory by myself. So I don't need to use @EntityScan. So it looks I'm getting more and more out of the setup by @EnableAutoConfiguration.
Second dataSource is setup without @EnableAutoConfiguration and create 'anotherTransactionManager' by manual way.
Since there are multiple transactionManager extends from PlatformTransactionManager, we should specify which transactionManager to use on each @Transactional annotation
Default Repository Config
@Configuration
@EnableTransactionManagement
@EnableAutoConfiguration
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactory",
transactionManagerRef = "transactionManager",
basePackages = {"com.mysource.repository"})
public class RepositoryConfig {
@Autowired
JpaVendorAdapter jpaVendorAdapter;
@Autowired
DataSource dataSource;
@Bean(name = "entityManager")
public EntityManager entityManager() {
return entityManagerFactory().createEntityManager();
}
@Primary
@Bean(name = "entityManagerFactory")
public EntityManagerFactory entityManagerFactory() {
LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
emf.setDataSource(dataSource);
emf.setJpaVendorAdapter(jpaVendorAdapter);
emf.setPackagesToScan("com.mysource.model");
emf.setPersistenceUnitName("default"); // <- giving 'default' as name
emf.afterPropertiesSet();
return emf.getObject();
}
@Bean(name = "transactionManager")
public PlatformTransactionManager transactionManager() {
JpaTransactionManager tm = new JpaTransactionManager();
tm.setEntityManagerFactory(entityManagerFactory());
return tm;
}
}
Another Repository Config
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "anotherEntityManagerFactory",
transactionManagerRef = "anotherTransactionManager",
basePackages = {"com.mysource.anothersource.repository"})
public class AnotherRepositoryConfig {
@Autowired
JpaVendorAdapter jpaVendorAdapter;
@Value("${another.datasource.url}")
private String databaseUrl;
@Value("${another.datasource.username}")
private String username;
@Value("${another.datasource.password}")
private String password;
@Value("${another.dataource.driverClassName}")
private String driverClassName;
@Value("${another.datasource.hibernate.dialect}")
private String dialect;
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource(databaseUrl, username, password);
dataSource.setDriverClassName(driverClassName);
return dataSource;
}
@Bean(name = "anotherEntityManager")
public EntityManager entityManager() {
return entityManagerFactory().createEntityManager();
}
@Bean(name = "anotherEntityManagerFactory")
public EntityManagerFactory entityManagerFactory() {
Properties properties = new Properties();
properties.setProperty("hibernate.dialect", dialect);
LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
emf.setDataSource(dataSource());
emf.setJpaVendorAdapter(jpaVendorAdapter);
emf.setPackagesToScan("com.mysource.anothersource.model"); // <- package for entities
emf.setPersistenceUnitName("anotherPersistenceUnit");
emf.setJpaProperties(properties);
emf.afterPropertiesSet();
return emf.getObject();
}
@Bean(name = "anotherTransactionManager")
public PlatformTransactionManager transactionManager() {
return new JpaTransactionManager(entityManagerFactory());
}
}
application.properties
# database configuration
spring.datasource.url=jdbc:h2:file:~/main-source;AUTO_SERVER=TRUE
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver
spring.datasource.continueOnError=true
spring.datasource.initialize=false
# another database configuration
another.datasource.url=jdbc:sqlserver://localhost:1433;DatabaseName=another;
another.datasource.username=username
another.datasource.password=
another.datasource.hibernate.dialect=org.hibernate.dialect.SQLServer2008Dialect
another.datasource.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver
Choose proper transactionManager for @Transactional annotation
Service for first datasource
@Service("mainService")
@Transactional("transactionManager")
public class DefaultDataSourceServiceImpl implements DefaultDataSourceService
{
//
}
Service for another datasource
@Service("anotherService")
@Transactional("anotherTransactionManager")
public class AnotherDataSourceServiceImpl implements AnotherDataSourceService
{
//
}
Here is an alternate solution for version 4.x of Select2. You can use listeners to catch the focus event and then open the select.
$('#test').select2({
// Initialisation here
}).data('select2').listeners['*'].push(function(name, target) {
if(name == 'focus') {
$(this.$element).select2("open");
}
});
Find the working example here based the exampel created by @tonywchen
I think you want something along the line of:
Parent:
<Editor name={this.state.fileData} />
Editor:
var Editor = React.createClass({
displayName: 'Editor',
propTypes: {
name: React.PropTypes.string.isRequired
},
getInitialState: function() {
return {
value: this.props.name
};
},
handleChange: function(event) {
this.setState({value: event.target.value});
},
render: function() {
return (
<form id="noter-save-form" method="POST">
<textarea id="noter-text-area" name="textarea" value={this.state.value} onChange={this.handleChange} />
<input type="submit" value="Save" />
</form>
);
}
});
This is basically a direct copy of the example provided on https://facebook.github.io/react/docs/forms.html
Update for React 16.8:
import React, { useState } from 'react';
const Editor = (props) => {
const [value, setValue] = useState(props.name);
const handleChange = (event) => {
setValue(event.target.value);
};
return (
<form id="noter-save-form" method="POST">
<textarea id="noter-text-area" name="textarea" value={value} onChange={handleChange} />
<input type="submit" value="Save" />
</form>
);
}
Editor.propTypes = {
name: PropTypes.string.isRequired
};
The solution is so simple:
Replace type "Submit" with button
<input type="button" value="Submit" onclick="this.form.submit()" />
this should work:
svn commit -m "<Your message here>" path/to/your/file
you can also add multiple files like this:
svn commit -m "<Your message here>" path/to/your/file [path/to/your/file] [path/to/your/file]
For 2020 Mac OS X Catalina users:
Forget about other useless answers, here only two steps needed:
Create a file with the naming convention: priority-appname. Then copy-paste the path you want to add to PATH
.
E.g. 80-vscode
with content /Applications/Visual Studio Code.app/Contents/Resources/app/bin/
in my case.
Move that file to /etc/paths.d/
. Don't forget to open a new tab(new session) in the Terminal and type echo $PATH
to check that your path is added!
Notice: this method only appends your path to PATH
.
This can be done by using PsExec
which can be downloaded here
psexec \\computer_name -u username -p password ipconfig
If this isn't working try doing this :-
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System.
Add a new DWORD value called LocalAccountTokenFilterPolicy
You are using older MySql version. Update your myqsl to 5.6.5+ it will work.
React Native comes with "Dimensions" api which we need to import from 'react-native'
import { Dimensions } from 'react-native';
Then,
<Image source={pic} style={{width: Dimensions.get('window').width, height: Dimensions.get('window').height}}></Image>
Had to add the service in the calling App.config file to have it work. Make sure that you but it after all . This seemed to work for me.
instead of:
android:drawable="@color/transparent"
write
android:drawable="@android:color/transparent"
What you asked for is:
IF OBJECT_ID('tempdb..##CLIENTS_KEYWORD') IS NOT NULL
BEGIN
DROP TABLE ##CLIENTS_KEYWORD
CREATE TABLE ##CLIENTS_KEYWORD(client_id int)
END
ELSE
CREATE TABLE ##CLIENTS_KEYWORD(client_id int)
IF OBJECT_ID('tempdb..##TEMP_CLIENTS_KEYWORD') IS NOT NULL
BEGIN
DROP TABLE ##TEMP_CLIENTS_KEYWORD
CREATE TABLE ##TEMP_CLIENTS_KEYWORD(client_id int)
END
ELSE
CREATE TABLE ##TEMP_CLIENTS_KEYWORD(client_id int)
Since you're always going to create the table, regardless of whether the table is deleted or not; a slightly optimised solution is:
IF OBJECT_ID('tempdb..##CLIENTS_KEYWORD') IS NOT NULL
DROP TABLE ##CLIENTS_KEYWORD
CREATE TABLE ##CLIENTS_KEYWORD(client_id int)
IF OBJECT_ID('tempdb..##TEMP_CLIENTS_KEYWORD') IS NOT NULL
DROP TABLE ##TEMP_CLIENTS_KEYWORD
CREATE TABLE ##TEMP_CLIENTS_KEYWORD(client_id int)
Note that *args/**kwargs is part of function-calling syntax, and not really an operator. This has a particular side effect that I ran into, which is that you can't use *args expansion with the print statement, since print is not a function.
This seems reasonable:
def myprint(*args):
print *args
Unfortunately it doesn't compile (syntax error).
This compiles:
def myprint(*args):
print args
But prints the arguments as a tuple, which isn't what we want.
This is the solution I settled on:
def myprint(*args):
for arg in args:
print arg,
print
Run ps aux | grep nodejs
, find the PID of the process you're looking for, then run kill
starting with SIGTERM (kill -15 25239
). If that doesn't work then use SIGKILL instead, replacing -15
with -9
.
You can use always stream writer.It will erase old data and append new one each time.
using (StreamWriter sw = new StreamWriter(filePath))
{
getNumberOfControls(frm1,sw);
}
Even better approach without flash or any other requirements is clipboard.js. All you need to do is add data-clipboard-target="#toCopyElement"
on any button, initialize it new Clipboard('.btn');
and it will copy the content of DOM with id toCopyElement
to clipboard. This is a snippet that copy the text provided in your question via a link.
One limitation though is that it does not work on safari, but it works on all other browser including mobile browsers as it does not use flash
$(function(){_x000D_
new Clipboard('.copy-text');_x000D_
});
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<script src="https://cdn.jsdelivr.net/clipboard.js/1.5.12/clipboard.min.js"></script>_x000D_
_x000D_
<p id="content">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s</p>_x000D_
_x000D_
<a class="copy-text" data-clipboard-target="#content" href="#">copy Text</a>
_x000D_
Expanding on betabandido's answer, you could write a function to inject the attributes as constants into the module:
def module_register_class_constants(klass, attr_prefix):
globals().update(
(name, getattr(klass, name)) for name in dir(klass) if name.startswith(attr_prefix)
)
class Animal(object):
SIZE_HUGE = "Huge"
SIZE_BIG = "Big"
module_register_class_constants(Animal, "SIZE_")
class Horse(Animal):
def printSize(self):
print SIZE_BIG
@RequestBody MultipartFile[] submissions
should be
@RequestParam("file") MultipartFile[] submissions
The files are not the request body, they are part of it and there is no built-in HttpMessageConverter
that can convert the request to an array of MultiPartFile
.
You can also replace HttpServletRequest
with MultipartHttpServletRequest
, which gives you access to the headers of the individual parts.
I found next workaround. You may escape the redirection after processing POST
request by manipulating history
object.
So you have the HTML form:
<form method=POST action='/process.php'>
<input type=submit value=OK>
</form>
When you process this form on your server you instead of redirecting user to /the/result/page
by setting up the Location
header like this:
$cat process.php
<?php
process POST data here
...
header('Location: /the/result/page');
exit();
?>
After processing POST
ed data you render small <script>
and the result /the/result/page
<?php
process POST data here
render the <script> // see below
render `/the/result/page` // OK
?>
The <script>
you should render:
<script>
window.onload = function() {
history.replaceState("", "", "/the/result/page");
}
</script>
The result is:
as you can see the form data is POST
ed to process.php
script.
This script process POST
ed data and rendering /the/result/page
at once with:
POST
data when you refresh page (F5) POST
when you navigate to previous/next page through the browser historyUPD
As another solution I ask feature request the Mozilla FireFox team to allow users to setup NextPage
header which will work like Location
header and make post/redirect/get
pattern obsolete.
In short. When server process form POST
data successfully it:
NextPage
header instead of Location
POST
form data as it would render for GET
request in post/redirect/get
patternThe browser in turn when see the NextPage
header:
window.location
with NextPage
valueGET
request to NextPage
instead of rePOST
form dataI think this would be excelent if implemented, would not? =)
I wrote this function after looking Integer.java
source code.
private static int stringSize(int x) {
final int[] sizeTable = {9, 99, 999, 9_999, 99_999, 999_999, 9_999_999,
99_999_999, 999_999_999, Integer.MAX_VALUE};
for (int i = 0; ; ++i) {
if (x <= sizeTable[i]) {
return i + 1;
}
}
}
Normally I would recommend floating but from your 3 requirements I would suggest this:
position: absolute;
right: 10px;
top: 5px;
Don't forget position: relative;
on the parent div
If you do not want to include that your code script (as advised by others above), then simply you may do the following after generating the figure window:
Go to "Edit" in the figure window
Go to "Figure Properties"
At the bottom, you can type the name you want in "Figure Name" field. You can uncheck "Show Figure Number".
That's all.
Good luck.
Basically, eval
is used to evaluate a single dynamically generated Python expression, and exec
is used to execute dynamically generated Python code only for its side effects.
eval
and exec
have these two differences:
eval
accepts only a single expression, exec
can take a code block that has Python statements: loops, try: except:
, class
and function/method def
initions and so on.
An expression in Python is whatever you can have as the value in a variable assignment:
a_variable = (anything you can put within these parentheses is an expression)
eval
returns the value of the given expression, whereas exec
ignores the return value from its code, and always returns None
(in Python 2 it is a statement and cannot be used as an expression, so it really does not return anything).
In versions 1.0 - 2.7, exec
was a statement, because CPython needed to produce a different kind of code object for functions that used exec
for its side effects inside the function.
In Python 3, exec
is a function; its use has no effect on the compiled bytecode of the function where it is used.
Thus basically:
>>> a = 5
>>> eval('37 + a') # it is an expression
42
>>> exec('37 + a') # it is an expression statement; value is ignored (None is returned)
>>> exec('a = 47') # modify a global variable as a side effect
>>> a
47
>>> eval('a = 47') # you cannot evaluate a statement
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
a = 47
^
SyntaxError: invalid syntax
The compile
in 'exec'
mode compiles any number of statements into a bytecode that implicitly always returns None
, whereas in 'eval'
mode it compiles a single expression into bytecode that returns the value of that expression.
>>> eval(compile('42', '<string>', 'exec')) # code returns None
>>> eval(compile('42', '<string>', 'eval')) # code returns 42
42
>>> exec(compile('42', '<string>', 'eval')) # code returns 42,
>>> # but ignored by exec
In the 'eval'
mode (and thus with the eval
function if a string is passed in), the compile
raises an exception if the source code contains statements or anything else beyond a single expression:
>>> compile('for i in range(3): print(i)', '<string>', 'eval')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
for i in range(3): print(i)
^
SyntaxError: invalid syntax
Actually the statement "eval accepts only a single expression" applies only when a string (which contains Python source code) is passed to eval
. Then it is internally compiled to bytecode using compile(source, '<string>', 'eval')
This is where the difference really comes from.
If a code
object (which contains Python bytecode) is passed to exec
or eval
, they behave identically, excepting for the fact that exec
ignores the return value, still returning None
always. So it is possible use eval
to execute something that has statements, if you just compile
d it into bytecode before instead of passing it as a string:
>>> eval(compile('if 1: print("Hello")', '<string>', 'exec'))
Hello
>>>
works without problems, even though the compiled code contains statements. It still returns None
, because that is the return value of the code object returned from compile
.
In the 'eval'
mode (and thus with the eval
function if a string is passed in), the compile
raises an exception if the source code contains statements or anything else beyond a single expression:
>>> compile('for i in range(3): print(i)', '<string>'. 'eval')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
for i in range(3): print(i)
^
SyntaxError: invalid syntax
exec
and eval
The exec
function (which was a statement in Python 2) is used for executing a dynamically created statement or program:
>>> program = '''
for i in range(3):
print("Python is cool")
'''
>>> exec(program)
Python is cool
Python is cool
Python is cool
>>>
The eval
function does the same for a single expression, and returns the value of the expression:
>>> a = 2
>>> my_calculation = '42 * a'
>>> result = eval(my_calculation)
>>> result
84
exec
and eval
both accept the program/expression to be run either as a str
, unicode
or bytes
object containing source code, or as a code
object which contains Python bytecode.
If a str
/unicode
/bytes
containing source code was passed to exec
, it behaves equivalently to:
exec(compile(source, '<string>', 'exec'))
and eval
similarly behaves equivalent to:
eval(compile(source, '<string>', 'eval'))
Since all expressions can be used as statements in Python (these are called the Expr
nodes in the Python abstract grammar; the opposite is not true), you can always use exec
if you do not need the return value. That is to say, you can use either eval('my_func(42)')
or exec('my_func(42)')
, the difference being that eval
returns the value returned by my_func
, and exec
discards it:
>>> def my_func(arg):
... print("Called with %d" % arg)
... return arg * 2
...
>>> exec('my_func(42)')
Called with 42
>>> eval('my_func(42)')
Called with 42
84
>>>
Of the 2, only exec
accepts source code that contains statements, like def
, for
, while
, import
, or class
, the assignment statement (a.k.a a = 42
), or entire programs:
>>> exec('for i in range(3): print(i)')
0
1
2
>>> eval('for i in range(3): print(i)')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
for i in range(3): print(i)
^
SyntaxError: invalid syntax
Both exec
and eval
accept 2 additional positional arguments - globals
and locals
- which are the global and local variable scopes that the code sees. These default to the globals()
and locals()
within the scope that called exec
or eval
, but any dictionary can be used for globals
and any mapping
for locals
(including dict
of course). These can be used not only to restrict/modify the variables that the code sees, but are often also used for capturing the variables that the exec
uted code creates:
>>> g = dict()
>>> l = dict()
>>> exec('global a; a, b = 123, 42', g, l)
>>> g['a']
123
>>> l
{'b': 42}
(If you display the value of the entire g
, it would be much longer, because exec
and eval
add the built-ins module as __builtins__
to the globals automatically if it is missing).
In Python 2, the official syntax for the exec
statement is actually exec code in globals, locals
, as in
>>> exec 'global a; a, b = 123, 42' in g, l
However the alternate syntax exec(code, globals, locals)
has always been accepted too (see below).
compile
The compile(source, filename, mode, flags=0, dont_inherit=False, optimize=-1)
built-in can be used to speed up repeated invocations of the same code with exec
or eval
by compiling the source into a code
object beforehand. The mode
parameter controls the kind of code fragment the compile
function accepts and the kind of bytecode it produces. The choices are 'eval'
, 'exec'
and 'single'
:
'eval'
mode expects a single expression, and will produce bytecode that when run will return the value of that expression:
>>> dis.dis(compile('a + b', '<string>', 'eval'))
1 0 LOAD_NAME 0 (a)
3 LOAD_NAME 1 (b)
6 BINARY_ADD
7 RETURN_VALUE
'exec'
accepts any kinds of python constructs from single expressions to whole modules of code, and executes them as if they were module top-level statements. The code object returns None
:
>>> dis.dis(compile('a + b', '<string>', 'exec'))
1 0 LOAD_NAME 0 (a)
3 LOAD_NAME 1 (b)
6 BINARY_ADD
7 POP_TOP <- discard result
8 LOAD_CONST 0 (None) <- load None on stack
11 RETURN_VALUE <- return top of stack
'single'
is a limited form of 'exec'
which accepts a source code containing a single statement (or multiple statements separated by ;
) if the last statement is an expression statement, the resulting bytecode also prints the repr
of the value of that expression to the standard output(!).
An if
-elif
-else
chain, a loop with else
, and try
with its except
, else
and finally
blocks is considered a single statement.
A source fragment containing 2 top-level statements is an error for the 'single'
, except in Python 2 there is a bug that sometimes allows multiple toplevel statements in the code; only the first is compiled; the rest are ignored:
In Python 2.7.8:
>>> exec(compile('a = 5\na = 6', '<string>', 'single'))
>>> a
5
And in Python 3.4.2:
>>> exec(compile('a = 5\na = 6', '<string>', 'single'))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
a = 5
^
SyntaxError: multiple statements found while compiling a single statement
This is very useful for making interactive Python shells. However, the value of the expression is not returned, even if you eval
the resulting code.
Thus greatest distinction of exec
and eval
actually comes from the compile
function and its modes.
In addition to compiling source code to bytecode, compile
supports compiling abstract syntax trees (parse trees of Python code) into code
objects; and source code into abstract syntax trees (the ast.parse
is written in Python and just calls compile(source, filename, mode, PyCF_ONLY_AST)
); these are used for example for modifying source code on the fly, and also for dynamic code creation, as it is often easier to handle the code as a tree of nodes instead of lines of text in complex cases.
While eval
only allows you to evaluate a string that contains a single expression, you can eval
a whole statement, or even a whole module that has been compile
d into bytecode; that is, with Python 2, print
is a statement, and cannot be eval
led directly:
>>> eval('for i in range(3): print("Python is cool")')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
for i in range(3): print("Python is cool")
^
SyntaxError: invalid syntax
compile
it with 'exec'
mode into a code
object and you can eval
it; the eval
function will return None
.
>>> code = compile('for i in range(3): print("Python is cool")',
'foo.py', 'exec')
>>> eval(code)
Python is cool
Python is cool
Python is cool
If one looks into eval
and exec
source code in CPython 3, this is very evident; they both call PyEval_EvalCode
with same arguments, the only difference being that exec
explicitly returns None
.
exec
between Python 2 and Python 3One of the major differences in Python 2 is that exec
is a statement and eval
is a built-in function (both are built-in functions in Python 3).
It is a well-known fact that the official syntax of exec
in Python 2 is exec code [in globals[, locals]]
.
Unlike majority of the Python 2-to-3 porting guides seem to suggest, the exec
statement in CPython 2 can be also used with syntax that looks exactly like the exec
function invocation in Python 3. The reason is that Python 0.9.9 had the exec(code, globals, locals)
built-in function! And that built-in function was replaced with exec
statement somewhere before Python 1.0 release.
Since it was desirable to not break backwards compatibility with Python 0.9.9, Guido van Rossum added a compatibility hack in 1993: if the code
was a tuple of length 2 or 3, and globals
and locals
were not passed into the exec
statement otherwise, the code
would be interpreted as if the 2nd and 3rd element of the tuple were the globals
and locals
respectively. The compatibility hack was not mentioned even in Python 1.4 documentation (the earliest available version online); and thus was not known to many writers of the porting guides and tools, until it was documented again in November 2012:
The first expression may also be a tuple of length 2 or 3. In this case, the optional parts must be omitted. The form
exec(expr, globals)
is equivalent toexec expr in globals
, while the formexec(expr, globals, locals)
is equivalent toexec expr in globals, locals
. The tuple form ofexec
provides compatibility with Python 3, whereexec
is a function rather than a statement.
Yes, in CPython 2.7 that it is handily referred to as being a forward-compatibility option (why confuse people over that there is a backward compatibility option at all), when it actually had been there for backward-compatibility for two decades.
Thus while exec
is a statement in Python 1 and Python 2, and a built-in function in Python 3 and Python 0.9.9,
>>> exec("print(a)", globals(), {'a': 42})
42
has had identical behaviour in possibly every widely released Python version ever; and works in Jython 2.5.2, PyPy 2.3.1 (Python 2.7.6) and IronPython 2.6.1 too (kudos to them following the undocumented behaviour of CPython closely).
What you cannot do in Pythons 1.0 - 2.7 with its compatibility hack, is to store the return value of exec
into a variable:
Python 2.7.11+ (default, Apr 17 2016, 14:00:29)
[GCC 5.3.1 20160413] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a = exec('print(42)')
File "<stdin>", line 1
a = exec('print(42)')
^
SyntaxError: invalid syntax
(which wouldn't be useful in Python 3 either, as exec
always returns None
), or pass a reference to exec
:
>>> call_later(exec, 'print(42)', delay=1000)
File "<stdin>", line 1
call_later(exec, 'print(42)', delay=1000)
^
SyntaxError: invalid syntax
Which a pattern that someone might actually have used, though unlikely;
Or use it in a list comprehension:
>>> [exec(i) for i in ['print(42)', 'print(foo)']
File "<stdin>", line 1
[exec(i) for i in ['print(42)', 'print(foo)']
^
SyntaxError: invalid syntax
which is abuse of list comprehensions (use a for
loop instead!).
For the usual usages of label
and input
, it's just easier to wrap input into a label like this:
import React from 'react'
const Field = props => (
<label>
<span>{props.label}</span>
<input type="text"/>
</label>
)
It's also makes it possible in checkboxes/radiobuttons to apply padding to root element and still getting feedback of click on input.