I tried renaming my build configuration Release
to Production
, but apparently cocoa pods doesn't like it. I renamed it again to Release
, and everything builds just fine.
Go to inspect element and check if .justify-content-center is listed as a class name under 'Styles' tab. If not, probably you are using bootstrap v3 in which justify-content-center is not defined.
If so, please update bootstrap, worked for me.
Installing XCode requires:
To install g++ *WITHOUT* having to download the MASSIVE 4.7G xCode install, try this package:
https://github.com/kennethreitz/osx-gcc-installer
The DMG files linked on that page are ~270M and much quicker to install. This was perfect for me, getting homebrew up and running with a minimum of hassle.
The github project itself is basically a script that repackages just the critical chunks of xCode for distribution. In order to run that script and build the DMG files, you'd need to already have an XCode install, which would kind of defeat the point, so the pre-built DMG files are hosted on the project page.
Perhaps the sched module will meet your needs.
Alternatively, consider using a Timer object.
Don't quote me on this, but you could use goto as suggested in the MSDN. There are other solutions, as including a flag that is checked in each iteration of both loops. Finally you could use an exception as a really heavyweight solution to your problem.
GOTO:
for ( int i = 0; i < 10; ++i ) {
for ( int j = 0; j < 10; ++j ) {
// code
if ( break_condition ) goto End;
// more code
}
}
End: ;
Condition:
bool exit = false;
for ( int i = 0; i < 10 && !exit; ++i ) {
for ( int j = 0; j < 10 && !exit; ++j ) {
// code
if ( break_condition ) {
exit = true;
break; // or continue
}
// more code
}
}
Exception:
try {
for ( int i = 0; i < 10 && !exit; ++i ) {
for ( int j = 0; j < 10 && !exit; ++j ) {
// code
if ( break_condition ) {
throw new Exception()
}
// more code
}
}
catch ( Exception e ) {}
I was trying the verb = "runas"
, but I still was getting UnauthorizedAccessException when trying to update registry value. Turned out it was due to not opening the subkey with writeable set to true.
Registry.OpenSubKey("KeyName", true);
Cannot write to Registry Key, getting UnauthorizedAccessException
If you are using PHPMyAdmin, it could be really simple. Suppose you have following databases:
DB1 & DB2
DB1 have a table users which you like to copy to DB2
Under PHPMyAdmin, open DB1, then go to users table.
On this page, click on the "Operations" tab on the top right. Under Operations, look for section Copy table to (database.table):
& you are done!
there's a maxlength attribute
<input type="text" name="textboxname" maxlength="100" />
Method Object JComboBox.getSelectedItem()
returns a value that is wrapped by Object
type so you have to cast it accordingly.
Syntax:
YourType varName = (YourType)comboBox.getSelectedItem();`
String value = comboBox.getSelectedItem().toString();
Try to toggle height.
function toggleTextArea()
{
var limitedHeight = '40px';
var targetEle = document.getElementById("textarea");
targetEle.style.height = (targetEle.style.height === '') ? limitedHeight : '';
}
First add a global variable
Context mContext;
Then change your constructor to this
public FeedAdapter(Context context, List<Post> myDataset) {
mContext = context;
mDataset = myDataset;
}
The pass your context when creating the adapter.
FeedAdapter myAdapter = new FeedAdapter(this,myDataset);
setup.py is designed to be run from the command line. You'll need to open your command prompt (In Windows 7, hold down shift while right-clicking in the directory with the setup.py file. You should be able to select "Open Command Window Here").
From the command line, you can type
python setup.py --help
...to get a list of commands. What you are looking to do is...
python setup.py install
In all of the cases above, the variable is correctly set, but not correctly read! The right way is to use double quotes when referencing:
echo "$var"
This gives the expected value in all the examples given. Always quote variable references!
Why?
When a variable is unquoted, it will:
Undergo field splitting where the value is split into multiple words on whitespace (by default):
Before: /* Foobar is free software */
After: /*
, Foobar
, is
, free
, software
, */
Each of these words will undergo pathname expansion, where patterns are expanded into matching files:
Before: /*
After: /bin
, /boot
, /dev
, /etc
, /home
, ...
Finally, all the arguments are passed to echo, which writes them out separated by single spaces, giving
/bin /boot /dev /etc /home Foobar is free software Desktop/ Downloads/
instead of the variable's value.
When the variable is quoted it will:
This is why you should always quote all variable references, unless you specifically require word splitting and pathname expansion. Tools like shellcheck are there to help, and will warn about missing quotes in all the cases above.
You can use CSS to fix it too
<div class="some-container">
[ <span ng-repeat="something in somethings">{{something}}<span class="list-comma">, </span></span> ]
</div>
.some-container span:last-child .list-comma{
display: none;
}
But Andy Joslin's answer is best
Edit: I changed my mind I had to do this recently and I ended up going with a join filter.
Are you just dealing with ASCII strings, and have no locale issues? Then yes, that would be a good way to do it.
The error is very straight forward, you imported react instead of React.
TechView.jsx
import React , { Component} from 'react';
class TechView extends Component {
constructor(props){
super(props);
this.state = {
name:'Gopinath'
}
}
render(){
return(
<span>hello Tech View</span>
);
}
}
export default TechView;
Also you don't need to import render in the above code unless it's the root level index.js.
index.js:
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import TechView from './TechView';
import * as serviceWorker from './serviceWorker';
ReactDOM.render(
<React.StrictMode>
<TechView />
</React.StrictMode>,
document.getElementById('root')
);
serviceWorker.unregister();
Note: You could have imported render the way you did in your original post and used it directly:
import React from 'react';
import { render } from 'react-dom';
import './index.css';
import TechView from './TechView';
import * as serviceWorker from './serviceWorker';
render(
<React.StrictMode>
<TechView />
</React.StrictMode>,
document.getElementById('root')
);
serviceWorker.unregister();
Here, TechView becomes the main react component, which is conventionally also known as App. So, in this context instead of naming the file as TechView.jsx I'd name it App.jsx and instead of naming the class as TechView I'd name it App.
Generically, you can use a custom font using @font-face
in your CSS. Here's a very basic example:
@font-face {
font-family: 'YourFontName'; /*a name to be used later*/
src: url('http://domain.com/fonts/font.ttf'); /*URL to font*/
}
Then, trivially, to use the font on a specific element:
.classname {
font-family: 'YourFontName';
}
(.classname
is your selector).
Note that certain font-formats don't work on all browsers; you can use fontsquirrel.com's generator to avoid too much effort converting.
You can find a nice set of free web-fonts provided by Google Fonts (also has auto-generated CSS @font-face
rules, so you don't have to write your own).
while also preventing people from having free access to download the font, if possible
Nope, it isn't possible to style your text with a custom font embedded via CSS, while preventing people from downloading it. You need to use images, Flash, or the HTML5 Canvas, all of which aren't very practical.
I hope that helped!
Something like:
Date oldDate = new Date(); // oldDate == current time
final long hoursInMillis = 60L * 60L * 1000L;
Date newDate = new Date(oldDate().getTime() +
(2L * hoursInMillis)); // Adds 2 hours
mysql version 5.5 set datetime default value as CURRENT_TIMESTAMP will be report error you can update to version 5.6 , it set datetime default value as CURRENT_TIMESTAMP
Something as simple as [a-z]+
, or perhaps [\S]+
, or even [a-zA-Z]+
?
Ultimately, this is completely platform-dependent. Unicode-support is, unfortunately, very poor in Standard C++. For GCC, you will have to make it a narrow string, as they use UTF-8, and Windows wants a wide string, and you must output to wcout
.
// GCC
std::cout << "?";
// Windoze
wcout << L"?";
What are you trying to achieve? There is absolutely no reason to ever do what you describe, and there is likely a much better solution to the problem you're trying to solve..
The most obvious alternative to what you request is a dictionary. For example:
>>> my_data = {'var': 'something'}
>>> my_data['something_else'] = 'something'
>>> print my_data.keys()
['var', 'something_else']
>>> print my_data['var']
something
Mostly as a.. challenge, I implemented your desired output. Do not use this code, please!
#!/usr/bin/env python2.6
class NewLocals:
"""Please don't ever use this code.."""
def __init__(self, initial_locals):
self.prev_locals = list(initial_locals.keys())
def show_new(self, new_locals):
output = ", ".join(list(set(new_locals) - set(self.prev_locals)))
self.prev_locals = list(new_locals.keys())
return output
# Set up
eww = None
eww = NewLocals(locals())
# "Working" requested code
var = {}
print eww.show_new(locals()) # Outputs: var
something_else = 3
print eww.show_new(locals()) # Outputs: something_else
# Further testing
another_variable = 4
and_a_final_one = 5
print eww.show_new(locals()) # Outputs: another_variable, and_a_final_one
If you have a collection of objects that you load using stored procedure you can also use LoadFromCollection
.
using (ExcelPackage package = new ExcelPackage(file))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("test");
worksheet.Cells["A1"].LoadFromCollection(myColl, true, OfficeOpenXml.Table.TableStyles.Medium1);
package.Save();
}
No, you can't use a non-standard size or dimension, as it'd wreak havoc on peoples' browsers wherever the icons are displayed. You could make it 12x16 (with four pixels of white/transparent padding on the 12 pixel side) to preserve your aspect ratio, but you can't go bigger (well, you can, but the browser'll shrink it).
Here is the annotation based example:
@SpringBootApplication
@ImportResource({"classpath*:spring-config.xml"})
public class MainApplication {
public static void main(String[] args) {
SpringApplication.run(MainApplication.class, args);
}
}
This can be done in in 3 lines of code:
// grab the window frame and adjust it for orientation
UIView *rootView = [[[UIApplication sharedApplication] keyWindow]
rootViewController].view;
CGRect originalFrame = [[UIScreen mainScreen] bounds];
CGRect adjustedFrame = [rootView convertRect:originalFrame fromView:nil];
That's because you are dealing with floating point numbers. Division by zero returns Infinity
, which is similar to NaN
(not a number).
If you want to prevent this, you have to test tab[i]
before using it. Then you can throw your own exception, if you really need it.
This worked for me to get domain in intranet
https://gist.github.com/jrothmanshore/2656003
It's a powershell script. Run it in PowerShell
.\ip_lookup.ps1 <ip>
Say Parent pom.xml contains 6 modules and you want to run A, B and F.
<modules>
<module>A</module>
<module>B</module>
<module>C</module>
<module>D</module>
<module>E</module>
<module>F</module>
</modules>
1- cd into parent project
mvn --projects A,B,F --also-make clean install
OR
mvn -pl A,B,F -am clean install
OR
mvn -pl A,B,F -amd clean install
Note: When you specify a project with the -am option, Maven will build all of the projects that the specified project depends upon (either directly or indirectly). Maven will examine the list of projects and walk down the dependency tree, finding all of the projects that it needs to build.
While the -am command makes all of the projects required by a particular project in a multi-module build, the -amd or --also-make-dependents option configures Maven to build a project and any project that depends on that project. When using --also-make-dependents, Maven will examine all of the projects in our reactor to find projects that depend on a particular project. It will automatically build those projects and nothing else.
Piping to 'wc' could be better IF the last line ends with a newline (I know that in this case, it will)
However, if the last line does not end with a newline 'wc -l' gives back a false result.
For example:
$ echo "asd" | wc -l
Will return 1
and
$ echo -n "asd" | wc -l
Will return 0
So what I often use is grep <anything> -c
$ echo "asd" | grep "^.*$" -c
1
$ echo -n "asd" | grep "^.*$" -c
1
This is closer to reality than what wc -l
will return.
Also, you can use <span ng-bind="hello"></span>
instead of {{hello}}
.
I have created a function that allows me to obtain this feature:
function redirect_blank(url) {
var a = document.createElement('a');
a.target="_blank";
a.href=url;
a.click();
}
Look at https://stackoverflow.com/a/4726838/2963099
Turn off pre compiled headers:
Project Properties -> C++ -> Precompiled Headers
set Precompiled Header
to "Not Using Precompiled Header"
.
You can create an html page with a form, having method="post" and action="yourdesiredurl" and open it with your browser.
As an alternative, there are some browser plugins for developers that allow you to do that, like Web Developer Toolbar for Firefox
I asume you have connected to your database already.
$sql = "SELECT * FROM my_table";
$result = mysql_query($sql);
$row = 1; // 1-based index
while($row_data = mysql_fetch_assoc($result)) {
$col = 0;
foreach($row_data as $key=>$value) {
$objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, $row, $value);
$col++;
}
$row++;
}
That error is due to missing of modules in pyinstaller. You can find the missing modules by running script in executable command line, i.e., by removing '-w' from the command. Once you created the command line executable file then in command line it will show the missing modules. By finding those missing modules you can add this to your command : " --hidden-import = missingmodule "
I solved my problem through this.
```yaml
{
"this-json": "looks awesome..."
}
If you want to have keys a different colour to the parameters, set your language as yaml
@Ankanna's answer gave me the idea of going through github's supported language list and yaml
was my best find.
This worked for me-
let routeData = this.$router.resolve(
{
path: '/resources/c-m-communities',
query: {'dataParameter': 'parameterValue'}
});
window.open(routeData.href, '_blank');
I modified @Rafael_Andrs_Cspedes_Basterio answer
The equality test, for example, in a case statement when clause, can be changed from
XYZ = NULL
to
XYZ IS NULL
If I want to treat blanks and empty string as equal to NULL I often also use an equality test like:
(NULLIF(ltrim( XYZ ),'') IS NULL)
I was struggling with this for a few days until I chanced on the issue when I had to build a new Dropdown. I had several DropDownList controls and attempted to get validation working with no luck. One was databound and the other was filled from the aspx page. I needed to drop the databound one and add a second manual list. In my case Validators failed if you built a dropdown like this and looked at any value (0 or -1) for either a required or compare validator:
<asp:DropDownList ID="DDL_Reason" CssClass="inputDropDown" runat="server">
<asp:ListItem>--Select--</asp:ListItem>
<asp:ListItem>Expired</asp:ListItem>
<asp:ListItem>Lost/Stolen</asp:ListItem>
<asp:ListItem>Location Change</asp:ListItem>
</asp:DropDownList>
However adding the InitialValue like this worked instantly for a compare Validator.
<asp:ListItem Text="-- Select --" Value="-1"></asp:ListItem>
git reset --soft commit_id
git stash save "message"
git reset --hard commit_id
git stash apply stash stash@{0}
git push --force
Unpopular opinion from 2020:
When it comes to ASP.NET apps I still prefer WebClient
over HttpClient
because:
It's your "fault" in that that's how Or
is defined, so it's the behaviour you should expect:
In a Boolean comparison, the Or operator always evaluates both expressions, which could include making procedure calls. The OrElse Operator (Visual Basic) performs short-circuiting, which means that if expression1 is True, then expression2 is not evaluated.
But you don't have to endure it. You can use OrElse
to get short-circuiting behaviour.
So you probably want:
If (example Is Nothing OrElse Not example.Item = compare.Item) Then
'Proceed
End If
I can't say it reads terribly nicely, but it should work...
Use the in
keyword.
if 'apples' in d:
if d['apples'] == 20:
print('20 apples')
else:
print('Not 20 apples')
If you want to get the value only if the key exists (and avoid an exception trying to get it if it doesn't), then you can use the get
function from a dictionary, passing an optional default value as the second argument (if you don't pass it it returns None
instead):
if d.get('apples', 0) == 20:
print('20 apples.')
else:
print('Not 20 apples.')
First note that
Mage::getBaseDir('skin')
returns only path to skin directory of your Magento install (/your/magento/dir/skin).
You can access absolute path to currently used skin directory using:
Mage::getDesign()->getSkinBaseDir()
This method accepts an associative array as optional parameter to modify result.
Following keys are recognized:
So in your case correct answer would be:
require(Mage::getDesign()->getSkinBaseDir().DS.'myfunc.php');
The correct url is:
file:///android_asset/RELATIVEPATH
where RELATIVEPATH is the path to your resource relative to the assets folder.
Note the 3 /'s in the scheme. Web view would not load any of my assets without the 3. I tried 2 as (previously) commented by CommonsWare and it wouldn't work. Then I looked at CommonsWare's source on github and noticed the extra forward slash.
This testing though was only done on the 1.6 Android emulator but I doubt its different on a real device or higher version.
EDIT: CommonsWare updated his answer to reflect this tiny change. So I've edited this so it still makes sense with his current answer.
It will work both, but personally I'd prefer option 2 so the span is "around" the link.
The following aggregation operation randomly selects 3 documents from the collection:
db.users.aggregate( [ { $sample: { size: 3 } } ] )
https://docs.mongodb.com/manual/reference/operator/aggregation/sample/
You could use Jquery indeed or plain good old javascript:
var opacityPercent=30;
document.getElementById("id").style.cssText="opacity:0."+opacityPercent+"; filter:progid:DXImageTransform.Microsoft.Alpha(style=0,opacity="+opacityPercent+");";
You put this in a function that you call on a setTimeout until the desired opacity is reached
I've found that you can use any subset condition for a given column by wrapping it in []. For instance, you have a df with columns ['Product','Time', 'Year', 'Color']
And let's say you want to include products made before 2014. You could write,
df[df['Year'] < 2014]
To return all the rows where this is the case. You can add different conditions.
df[df['Year'] < 2014][df['Color' == 'Red']
Then just choose the columns you want as directed above. For instance, the product color and key for the df above,
df[df['Year'] < 2014][df['Color'] == 'Red'][['Product','Color']]
I think you can use methods of the str
type to do this. There's no need for regular expressions:
def remove_prefix(text, prefix):
if text.startswith(prefix): # only modify the text if it starts with the prefix
text = text.replace(prefix, "", 1) # remove one instance of prefix
return text
Transposing is inefficient for large DataFrames. Here is an alternative:
def duplicate_columns(frame):
groups = frame.columns.to_series().groupby(frame.dtypes).groups
dups = []
for t, v in groups.items():
dcols = frame[v].to_dict(orient="list")
vs = dcols.values()
ks = dcols.keys()
lvs = len(vs)
for i in range(lvs):
for j in range(i+1,lvs):
if vs[i] == vs[j]:
dups.append(ks[i])
break
return dups
Use it like this:
dups = duplicate_columns(frame)
frame = frame.drop(dups, axis=1)
Edit
A memory efficient version that treats nans like any other value:
from pandas.core.common import array_equivalent
def duplicate_columns(frame):
groups = frame.columns.to_series().groupby(frame.dtypes).groups
dups = []
for t, v in groups.items():
cs = frame[v].columns
vs = frame[v]
lcs = len(cs)
for i in range(lcs):
ia = vs.iloc[:,i].values
for j in range(i+1, lcs):
ja = vs.iloc[:,j].values
if array_equivalent(ia, ja):
dups.append(cs[i])
break
return dups
For two way communication with named pipes:
Named pipes are quite easy to implement.
E.g. I implemented a project in C with named pipes, thanks to standart file input-output based communication (fopen, fprintf, fscanf ...) it was so easy and clean (if that is also a consideration).
I even coded them with java (I was serializing and sending objects over them!)
Named pipes has one disadvantage:
Use numpy.tile
:
>>> tile(array([1,2,3]), (3, 1))
array([[1, 2, 3],
[1, 2, 3],
[1, 2, 3]])
or for repeating columns:
>>> tile(array([[1,2,3]]).transpose(), (1, 3))
array([[1, 1, 1],
[2, 2, 2],
[3, 3, 3]])
No answer so far mentions eu-strip --strip-debug -f <out.debug> <input>
.
elfutils
package. <input>
file has been stripped of debug symbols which are now all in <out.debug>
.Use window.open()
:
<a onclick="window.open(document.URL, '_blank', 'location=yes,height=570,width=520,scrollbars=yes,status=yes');">
Share Page
</a>
This will create a link titled Share Page
which opens the current url in a new window with a height of 570 and width of 520.
Iterator<JSONObject> iterator = jsonObject.values().iterator();
while (iterator.hasNext()) {
jsonChildObject = iterator.next();
// Do whatever you want with jsonChildObject
String id = (String) jsonChildObject.get("id");
}
try using max-width: 100%;
on your canvas.
canvas {
max-width: 100%;
}
You can increase security in authentication process by using JWT (JSON Web Tokens) and SSL/HTTPS.
The Basic Auth / Session ID can be stolen via:
By using JWT you're encrypting the user's authentication details and storing in the client, and sending it along with every request to the API, where the server/API validates the token. It can't be decrypted/read without the private key (which the server/API stores secretly) Read update.
The new (more secure) flow would be:
Updated 30.07.15:
JWT payload/claims can actually be read without the private key (secret) and it's not secure to store it in localStorage. I'm sorry about these false statements. However they seem to be working on a JWE standard (JSON Web Encryption).
I implemented this by storing claims (userID, exp) in a JWT, signed it with a private key (secret) the API/backend only knows about and stored it as a secure HttpOnly cookie on the client. That way it cannot be read via XSS and cannot be manipulated, otherwise the JWT fails signature verification. Also by using a secure HttpOnly cookie, you're making sure that the cookie is sent only via HTTP requests (not accessible to script) and only sent via secure connection (HTTPS).
Updated 17.07.16:
JWTs are by nature stateless. That means they invalidate/expire themselves. By adding the SessionID in the token's claims you're making it stateful, because its validity doesn't now only depend on signature verification and expiry date, it also depends on the session state on the server. However the upside is you can invalidate tokens/sessions easily, which you couldn't before with stateless JWTs.
Inline elements (like SPAN, LABEL, etc.) are displayed so that their height and width are calculated by the browser based on their content. If you want to control height and width you have to change those elements' blocks.
display: block;
makes the element displayed as a solid block (like DIV tags) which means that there is a line break after the element (it's not inline). Although you can use display: inline-block
to fix the issue of line break, this solution does not work in IE6 because IE6 doesn't recognize inline-block. If you want it to be cross-browser compatible then look at this article: http://webjazz.blogspot.com/2008/01/getting-inline-block-working-across.html
Just remember, for all the solutions given so far, the shell decides the order in which the files are concatenated. For Bash, IIRC, that's alphabetical order. If the order is important, you should either name the files appropriately (01file.txt, 02file.txt, etc...) or specify each file in the order you want it concatenated.
$ cat file1 file2 file3 file4 file5 file6 > out.txt
One key difference not yet mentioned is that while sleeping a Thread does not release the locks it holds, while waiting releases the lock on the object that wait()
is called on.
synchronized(LOCK) {
Thread.sleep(1000); // LOCK is held
}
synchronized(LOCK) {
LOCK.wait(); // LOCK is not held
}
checked="checked"
are equivalent;
according to spec checkbox '----? checked = "checked" or "" (empty string) or empty Specifies that the element represents a selected control.---'
For the same solution I was looking for Angularjs directive with ng-Model
.
Here is the code that resolve the problem.
myApp.directive('zipcodeformatter', function () {
return {
restrict: 'A', // only activate on element attribute
require: '?ngModel', // get a hold of NgModelController
link: function (scope, element, attrs, ngModel) {
scope.$watch(attrs.ngModel, function (v) {
if (v) {
console.log('value changed, new value is: ' + v + ' ' + v.length);
if (v.length > 5) {
var newzip = v.replace("-", '');
var str = newzip.substring(0, 5) + '-' + newzip.substring(5, newzip.length);
element.val(str);
} else {
element.val(v);
}
}
});
}
};
});
HTML DOM
<input maxlength="10" zipcodeformatter onkeypress="return isNumberKey(event)" placeholder="Zipcode" type="text" ng-readonly="!checked" name="zipcode" id="postal_code" class="form-control input-sm" ng-model="patient.shippingZipcode" required ng-required="true">
My Result is:
92108-2223
A bit off on the "duck typing" definition -- dict.keys()
returns an iterable object, not a list-like object. It will work anywhere an iterable will work -- not any place a list will. a list is also an iterable, but an iterable is NOT a list (or sequence...)
In real use-cases, the most common thing to do with the keys in a dict is to iterate through them, so this makes sense. And if you do need them as a list you can call list()
.
Very similarly for zip()
-- in the vast majority of cases, it is iterated through -- why create an entire new list of tuples just to iterate through it and then throw it away again?
This is part of a large trend in python to use more iterators (and generators), rather than copies of lists all over the place.
dict.keys()
should work with comprehensions, though -- check carefully for typos or something... it works fine for me:
>>> d = dict(zip(['Sounder V Depth, F', 'Vessel Latitude, Degrees-Minutes'], [None, None]))
>>> [key.split(", ") for key in d.keys()]
[['Sounder V Depth', 'F'], ['Vessel Latitude', 'Degrees-Minutes']]
How about get_the_category?
You can then do
$category = get_the_category();
$firstCategory = $category[0]->cat_name;
All the classes including the abstract classes can have constructors.Abstract class constructors will be called when its concrete subclass will be instantiated
What happens with bittorrent and a DHT is that at the beginning bittorrent uses information embedded in the torrent file to go to either a tracker or one of a set of nodes from the DHT. Then once it finds one node, it can continue to find others and persist using the DHT without needing a centralized tracker to maintain it.
The original information bootstraps the later use of the DHT.
Hope it helps someone on earth. In my case jQuery and $ were available but not when the plugin bootstrapped so I wrapped everything inside a setTimeout. Wrapping inside setTimeout helped me fix the error:
setTimeout(() => {
/** Your code goes here */
!function(t, e) {
}(window);
})
And what about it?:
ImageIcon imageIcon = new ImageIcon(new ImageIcon("icon.png").getImage().getScaledInstance(20, 20, Image.SCALE_DEFAULT));
label.setIcon(imageIcon);
pd.set_option('display.max_rows', 500)
df
Does not work in Jupyter!
Instead use:
pd.set_option('display.max_rows', 500)
df.head(500)
It can work well as you guess
python testMyCase.py MyCase.testItIsHot
And there is another way to just test testItIsHot
:
suite = unittest.TestSuite()
suite.addTest(MyCase("testItIsHot"))
runner = unittest.TextTestRunner()
runner.run(suite)
What is a
when you call Ancestors('A',a)
? If a['A']
is None, or if a['A'][0]
is None, you'd receive that exception.
You are probably manually calling setVisible(true)
on the menu. That can cause some nasty buggy behavior in the menu.
The show(Component, int x, int x)
method handles all of the things you need to happen, (Highlighting things on mouseover and closing the popup when necessary) where using setVisible(true)
just shows the menu without adding any additional behavior.
To make a right click popup menu simply create a JPopupMenu
.
class PopUpDemo extends JPopupMenu {
JMenuItem anItem;
public PopUpDemo() {
anItem = new JMenuItem("Click Me!");
add(anItem);
}
}
Then, all you need to do is add a custom MouseListener
to the components you would like the menu to popup for.
class PopClickListener extends MouseAdapter {
public void mousePressed(MouseEvent e) {
if (e.isPopupTrigger())
doPop(e);
}
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger())
doPop(e);
}
private void doPop(MouseEvent e) {
PopUpDemo menu = new PopUpDemo();
menu.show(e.getComponent(), e.getX(), e.getY());
}
}
// Then on your component(s)
component.addMouseListener(new PopClickListener());
Of course, the tutorials have a slightly more in-depth explanation.
Note: If you notice that the popup menu is appearing way off from where the user clicked, try using the e.getXOnScreen()
and e.getYOnScreen()
methods for the x and y coordinates.
Yes, it is because you are using auto layout. Setting the view frame and resizing mask will not work.
You should read Working with Auto Layout Programmatically and Visual Format Language.
You will need to get the current constraints, add the text field, adjust the contraints for the text field, then add the correct constraints on the text field.
Found the problem and couldn't find the solution until tried this.
I'm not sure if this has any side-effect, but it is work for me now.
see the code below of arraylist default it is 10 when u create List l = new ArrayList();
public class ArrayList<E> extends AbstractList<E> implements List<E>,
Cloneable, Serializable, RandomAccess {
private static final long serialVersionUID = 8683452581122892189L;
private transient int firstIndex;
private transient int lastIndex;
private transient E[] array;
/**
* Constructs a new instance of {@code ArrayList} with ten capacity.
*/
public ArrayList() {
this(10);
}
I recommend something like this:
public class MyMap {
Map<Object, V> map = new HashMap<Object, V>();
public V put(K1 key,V value){
return map.put(key, value);
}
public V put(K2 key,V value){
return map.put(key, value);
}
public V get(K1 key){
return map.get(key);
}
public V get(K2 key){
return map.get(key);
}
//Same for conatains
}
Then you can use it like:
myMap.put(k1,value)
or myMap.put(k2,value)
Advantages: It is simple, enforces type safety, and doesn't store repeated data (as the two maps solutions do, though still store duplicate values).
Drawbacks: Not generic.
You can try:
string s1 = Regex.Replace(s, "[^A-Za-z0-9 -]", "");
Where s
is your string.
You can always fall back to the good old WinAPI calls, although the amount of work involved is non-trivial. There is no requirement that .NET services be installed via a .NET-aware mechanism.
To install:
OpenSCManager
.CreateService
to register the service.ChangeServiceConfig2
to set a description.CloseServiceHandle
.To uninstall:
OpenSCManager
.OpenService
.DeleteService
on the handle returned by OpenService
.CloseServiceHandle
.The main reason I prefer this over using the ServiceInstaller
/ServiceProcessInstaller
is that you can register the service with your own custom command line arguments. For example, you might register it as "MyApp.exe -service"
, then if the user runs your app without any arguments you could offer them a UI to install/remove the service.
Running Reflector on ServiceInstaller
can fill in the details missing from this brief explanation.
P.S. Clearly this won't have "the same effect as calling: InstallUtil MyService.exe" - in particular, you won't be able to uninstall using InstallUtil. But it seems that perhaps this wasn't an actual stringent requirement for you.
I faced this kind of issue once in my case here's what i did
In most of the cases i got it running at step 6 extreme cases i had to restart my machine.
The thread module does work simultaneously unlike multiprocess, but the timing is a bit off. The code below prints a "1" and a "2". These are called by different functions respectively. I did notice that when printed to the console, they would have slightly different timings.
from threading import Thread
def one():
while(1 == num):
print("1")
time.sleep(2)
def two():
while(1 == num):
print("2")
time.sleep(2)
p1 = Thread(target = one)
p2 = Thread(target = two)
p1.start()
p2.start()
Output: (Note the space is for the wait in between printing)
1
2
2
1
12
21
12
1
2
Not sure if there is a way to correct this, or if it matters at all. Just something I noticed.
Once you have your key stored in a PEM file, you can read it back easily using PemObject and PemReader classes provided by BouncyCastle, as shown in this this tutorial.
Create a PemFile class that encapsulates file handling:
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemReader;
public class PemFile {
private PemObject pemObject;
public PemFile(String filename) throws FileNotFoundException, IOException {
PemReader pemReader = new PemReader(new InputStreamReader(
new FileInputStream(filename)));
try {
this.pemObject = pemReader.readPemObject();
} finally {
pemReader.close();
}
}
public PemObject getPemObject() {
return pemObject;
}
}
Then instantiate private and public keys as usual:
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import org.apache.log4j.Logger;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class Main {
protected final static Logger LOGGER = Logger.getLogger(Main.class);
public final static String RESOURCES_DIR = "src/main/resources/rsa-sample/";
public static void main(String[] args) throws FileNotFoundException,
IOException, NoSuchAlgorithmException, NoSuchProviderException {
Security.addProvider(new BouncyCastleProvider());
LOGGER.info("BouncyCastle provider added.");
KeyFactory factory = KeyFactory.getInstance("RSA", "BC");
try {
PrivateKey priv = generatePrivateKey(factory, RESOURCES_DIR
+ "id_rsa");
LOGGER.info(String.format("Instantiated private key: %s", priv));
PublicKey pub = generatePublicKey(factory, RESOURCES_DIR
+ "id_rsa.pub");
LOGGER.info(String.format("Instantiated public key: %s", pub));
} catch (InvalidKeySpecException e) {
e.printStackTrace();
}
}
private static PrivateKey generatePrivateKey(KeyFactory factory,
String filename) throws InvalidKeySpecException,
FileNotFoundException, IOException {
PemFile pemFile = new PemFile(filename);
byte[] content = pemFile.getPemObject().getContent();
PKCS8EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(content);
return factory.generatePrivate(privKeySpec);
}
private static PublicKey generatePublicKey(KeyFactory factory,
String filename) throws InvalidKeySpecException,
FileNotFoundException, IOException {
PemFile pemFile = new PemFile(filename);
byte[] content = pemFile.getPemObject().getContent();
X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(content);
return factory.generatePublic(pubKeySpec);
}
}
Hope this helps.
Allow Apache Through the Firewall
Allow the default HTTP and HTTPS port, ports 80 and 443, through firewalld:
sudo firewall-cmd --permanent --add-port=80/tcp
sudo firewall-cmd --permanent --add-port=443/tcp
And reload the firewall:
sudo firewall-cmd --reload
Thanks for the help. This is what I ended up doing in order to make it work.
CREATE VIEW V AS
SELECT *
FROM ((POP NATURAL FULL OUTER JOIN FOOD)
NATURAL FULL OUTER JOIN INCOME);
Another way to look at it is to consider git rebase master
as:
Rebase the current branch on top of
master
Here , 'master
' is the upstream branch, and that explain why, during a rebase, ours
and theirs
are reversed.
I have found that python-dotenv helps solve this issue pretty effectively. Your project structure ends up changing slightly, but the code in your notebook is a bit simpler and consistent across notebooks.
For your project, do a little install.
pipenv install python-dotenv
Then, project changes to:
+-- .env (this can be empty)
+-- ipynb
¦ +-- 20170609-Examine_Database_Requirements.ipynb
¦ +-- 20170609-Initial_Database_Connection.ipynb
+-- lib
+-- __init__.py
+-- postgres.py
And finally, your import changes to:
import os
import sys
from dotenv import find_dotenv
sys.path.append(os.path.dirname(find_dotenv()))
A +1 for this package is that your notebooks can be several directories deep. python-dotenv will find the closest one in a parent directory and use it. A +2 for this approach is that jupyter will load environment variables from the .env file on startup. Double whammy.
Building on the other answers, I wanted to share an example of using the while loop construct to achieve a do-while behaviour. By using a simple boolean variable in the while condition (initialized to TRUE), and then checking our actual condition later in the if statement. One could also use a break keyword instead of the continue <- FALSE inside the if statement (probably more efficient).
df <- data.frame(X=c(), R=c())
x <- x0
continue <- TRUE
while(continue)
{
xi <- (11 * x) %% 16
df <- rbind(df, data.frame(X=x, R=xi))
x <- xi
if(xi == x0)
{
continue <- FALSE
}
}
you can use solutions without adding "Access-Control-Allow-Origin": "*", if your server is already using Proxy gateway this issue will not happen because the front and backend will be route in the same IP and port in client side but for development, you need one of this three solution if you don't need extra code 1- simulate the real environment by using a proxy server and configure the front and backend in the same port
2- if you using Chrome you can use the extension called Allow-Control-Allow-Origin: * it will help you to avoid this problem
3- you can use the code but some browsers versions may not support that so try to use one of the previous solutions
the best solution is using a proxy like ngnix its easy to configure and it will simulate the real situation of the production deployment
That's working for me in Kotlin.
class LEDRecyclerAdapter (var currentPole: Pole): RecyclerView.Adapter<RecyclerView.ViewHolder>() { ... }
adapter.currentPole = pole
adapter.notifyDataSetChanged()
The scroll offset doesn't change.
Here there is a simple solution for the problem. This command:
script.dir <- dirname(sys.frame(1)$ofile)
returns the path of the current script file. It works after the script was saved.
FWIW CloudFront supports streaming as well. Might be better than plain streaming from instances.
send an output parameter like
@newId int output
at the end use
select @newId = Scope_Identity()
return @newId
The source referenced by the OP has some credibility ...but what about Microsoft - what is the stance on struct usage? I sought some extra learning from Microsoft, and here is what I found:
Consider defining a structure instead of a class if instances of the type are small and commonly short-lived or are commonly embedded in other objects.
Do not define a structure unless the type has all of the following characteristics:
- It logically represents a single value, similar to primitive types (integer, double, and so on).
- It has an instance size smaller than 16 bytes.
- It is immutable.
- It will not have to be boxed frequently.
Okay, #2 and #3 anyway. Our beloved dictionary has 2 internal structs:
[StructLayout(LayoutKind.Sequential)] // default for structs
private struct Entry //<Tkey, TValue>
{
// View code at *Reference Source
}
[Serializable, StructLayout(LayoutKind.Sequential)]
public struct Enumerator :
IEnumerator<KeyValuePair<TKey, TValue>>, IDisposable,
IDictionaryEnumerator, IEnumerator
{
// View code at *Reference Source
}
The 'JonnyCantCode.com' source got 3 out of 4 - quite forgivable since #4 probably wouldn't be an issue. If you find yourself boxing a struct, rethink your architecture.
Let's look at why Microsoft would use these structs:
Entry
and Enumerator
, represent single values.Entry
is never passed as a parameter outside of the Dictionary class. Further investigation shows that in order to satisfy implementation of IEnumerable, Dictionary uses the Enumerator
struct which it copies every time an enumerator is requested ...makes sense.Enumerator
is public because Dictionary is enumerable and must have equal accessibility to the IEnumerator interface implementation - e.g. IEnumerator getter. Update - In addition, realize that when a struct implements an interface - as Enumerator does - and is cast to that implemented type, the struct becomes a reference type and is moved to the heap. Internal to the Dictionary class, Enumerator is still a value type. However, as soon as a method calls GetEnumerator()
, a reference-type IEnumerator
is returned.
What we don't see here is any attempt or proof of requirement to keep structs immutable or maintaining an instance size of only 16 bytes or less:
readonly
- not immutableEntry
has an undetermined lifetime (from Add()
, to Remove()
, Clear()
, or garbage collection);And ... 4. Both structs store TKey and TValue, which we all know are quite capable of being reference types (added bonus info)
Hashed keys notwithstanding, dictionaries are fast in part because instancing a struct is quicker than a reference type. Here, I have a Dictionary<int, int>
that stores 300,000 random integers with sequentially incremented keys.
Capacity: 312874
MemSize: 2660827 bytes
Completed Resize: 5ms
Total time to fill: 889ms
Capacity: number of elements available before the internal array must be resized.
MemSize: determined by serializing the dictionary into a MemoryStream and getting a byte length (accurate enough for our purposes).
Completed Resize: the time it takes to resize the internal array from 150862 elements to 312874 elements. When you figure that each element is sequentially copied via Array.CopyTo()
, that ain't too shabby.
Total time to fill: admittedly skewed due to logging and an OnResize
event I added to the source; however, still impressive to fill 300k integers while resizing 15 times during the operation. Just out of curiosity, what would the total time to fill be if I already knew the capacity? 13ms
So, now, what if Entry
were a class? Would these times or metrics really differ that much?
Capacity: 312874
MemSize: 2660827 bytes
Completed Resize: 26ms
Total time to fill: 964ms
Obviously, the big difference is in resizing. Any difference if Dictionary is initialized with the Capacity? Not enough to be concerned with ... 12ms.
What happens is, because Entry
is a struct, it does not require initialization like a reference type. This is both the beauty and the bane of the value type. In order to use Entry
as a reference type, I had to insert the following code:
/*
* Added to satisfy initialization of entry elements --
* this is where the extra time is spent resizing the Entry array
* **/
for (int i = 0 ; i < prime ; i++)
{
destinationArray[i] = new Entry( );
}
/* *********************************************** */
The reason I had to initialize each array element of Entry
as a reference type can be found at MSDN: Structure Design. In short:
Do not provide a default constructor for a structure.
If a structure defines a default constructor, when arrays of the structure are created, the common language runtime automatically executes the default constructor on each array element.
Some compilers, such as the C# compiler, do not allow structures to have default constructors.
It is actually quite simple and we will borrow from Asimov's Three Laws of Robotics:
...what do we take away from this: in short, be responsible with the use of value types. They are quick and efficient, but have the ability to cause many unexpected behaviors if not properly maintained (i.e. unintentional copies).
Another intuitive solution could be:
class Post
{
public $title;
public $date;
}
$posts = array();
$posts[0] = new Post();
$posts[0]->title = 'post sample 1';
$posts[0]->date = '1/1/2021';
$posts[1] = new Post();
$posts[1]->title = 'post sample 2';
$posts[1]->date = '2/2/2021';
foreach ($posts as $post) {
echo 'Post Title:' . $post->title . ' Post Date:' . $post->date . "\n";
}
you can do a multi div layout like this
<div class="fieldcontainer">
<div class="label"></div>
<div class="field"></div>
</div>
where .fieldcontainer { clear: both; } .label { float: left; width: ___ } .field { float: left; }
Or, I actually prefer tables for forms like this. This is very much tabular data and it comes out very clean. Both will work though.
//
syntaxregex.test(string)
, not string.test(regex)
So
jQuery(function () {
$(".mail").keyup(function () {
var VAL = this.value;
var email = new RegExp('^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$');
if (email.test(VAL)) {
alert('Great, you entered an E-Mail-address');
}
});
});
In order to reduce crc32 to taking the reminder you need to:
In code this is:
func CRC32 (file []byte) uint32 {
for i , v := range(file) {
file[i] = bits.Reverse8(v)
}
for i := 0; i < 4; i++ {
file[i] ^= 0xFF
}
// Add padding
file = append(file, []byte{0, 0, 0, 0}...)
newReminder := bits.Reverse32(reminderIEEE(file))
return newReminder ^ 0xFFFFFFFF
}
where reminderIEEE is the pure reminder on GF(2)[x]
Aggregated List of Libraries
The equivalent of LIMIT
is SET ROWCOUNT
, but if you want generic pagination it's better to write a query like this:
;WITH Results_CTE AS
(
SELECT
Col1, Col2, ...,
ROW_NUMBER() OVER (ORDER BY SortCol1, SortCol2, ...) AS RowNum
FROM Table
WHERE <whatever>
)
SELECT *
FROM Results_CTE
WHERE RowNum >= @Offset
AND RowNum < @Offset + @Limit
The advantage here is the parameterization of the offset and limit in case you decide to change your paging options (or allow the user to do so).
Note: the @Offset
parameter should use one-based indexing for this rather than the normal zero-based indexing.
With sed
on dash
shell of LANG=en_US.UTF-8
, I got the followings working right:
$ echo "??? ????????" | sed -e 's/\(.\)/\1\n/g'
?
?
?
?
?
?
?
?
?
?
?
and
$ echo "Hello world" | sed -e 's/\(.\)/\1\n/g'
H
e
l
l
o
w
o
r
l
d
Thus, output can be looped with while read ... ; do ... ; done
edited for sample text translate into English:
"??? ????????" is zh_TW.UTF-8 encoding for:
"???" = How are you[ doing]
" " = a normal space character
"???" = Happy new year
"?????" = a double-byte-sized full-stop followed by text description
As pointed out by fyrye, the accepted answer pertains to older versions of MySQL in which ONLY_FULL_GROUP_BY
had not yet been introduced. With MySQL 8.0.17 (used in this example), unless you disable ONLY_FULL_GROUP_BY
you would get the following error message:
mysql> SELECT id, firstName, lastName FROM table_name GROUP BY firstName;
ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'mydatabase.table_name.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
One way to work around this not mentioned by fyrye, but described in https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html, is to apply the ANY_VALUE()
function to the columns which are not in the GROUP BY
clause (id
and lastName
in this example):
mysql> SELECT ANY_VALUE(id) as id, firstName, ANY_VALUE(lastName) as lastName FROM table_name GROUP BY firstName;
+----+-----------+----------+
| id | firstName | lastName |
+----+-----------+----------+
| 1 | John | Doe |
| 2 | Bugs | Bunny |
+----+-----------+----------+
2 rows in set (0.01 sec)
As written in the aforementioned docs,
In this case, MySQL ignores the nondeterminism of address values within each name group and accepts the query. This may be useful if you simply do not care which value of a nonaggregated column is chosen for each group.
ANY_VALUE()
is not an aggregate function, unlike functions such asSUM()
orCOUNT()
. It simply acts to suppress the test for nondeterminism.
I don't think there is one in JRE. You can find similar functions in other packages like Apache HttpClient. If you don't use any other packages, you just have to write your own. It's not that hard. Here is what I use,
public class QueryString {
private Map<String, List<String>> parameters;
public QueryString(String qs) {
parameters = new TreeMap<String, List<String>>();
// Parse query string
String pairs[] = qs.split("&");
for (String pair : pairs) {
String name;
String value;
int pos = pair.indexOf('=');
// for "n=", the value is "", for "n", the value is null
if (pos == -1) {
name = pair;
value = null;
} else {
try {
name = URLDecoder.decode(pair.substring(0, pos), "UTF-8");
value = URLDecoder.decode(pair.substring(pos+1, pair.length()), "UTF-8");
} catch (UnsupportedEncodingException e) {
// Not really possible, throw unchecked
throw new IllegalStateException("No UTF-8");
}
}
List<String> list = parameters.get(name);
if (list == null) {
list = new ArrayList<String>();
parameters.put(name, list);
}
list.add(value);
}
}
public String getParameter(String name) {
List<String> values = parameters.get(name);
if (values == null)
return null;
if (values.size() == 0)
return "";
return values.get(0);
}
public String[] getParameterValues(String name) {
List<String> values = parameters.get(name);
if (values == null)
return null;
return (String[])values.toArray(new String[values.size()]);
}
public Enumeration<String> getParameterNames() {
return Collections.enumeration(parameters.keySet());
}
public Map<String, String[]> getParameterMap() {
Map<String, String[]> map = new TreeMap<String, String[]>();
for (Map.Entry<String, List<String>> entry : parameters.entrySet()) {
List<String> list = entry.getValue();
String[] values;
if (list == null)
values = null;
else
values = (String[]) list.toArray(new String[list.size()]);
map.put(entry.getKey(), values);
}
return map;
}
}
I found a more straight forward solution from @DK comment in this question, the solution is written by Alex and described here with source, To make customized window:
The other big difference is Abandon does not remove items immediately, but when it does then cleanup it does a loop over session items to check for STA COM objects it needs to handle specially. And this can be a problem.
Under high load it's possible for two (or more) requests to make it to the server for the same session (that is two requests with the same session cookie). Their execution will be serialized, but since Abandon doesn't clear out the items synchronously but rather sets a flag it's possible for both requests to run, and both requests to schedule a work item to clear out session "later". Both these work items can then run at the same time, and both are checking the session objects, and both are clearing out the array of objects, and what happens when you have two things iterating over a list and changing it?? Boom! And since this happens in a queueuserworkitem callback and is NOT done in a try/catch (thanks MS), it will bring down your entire app domain. Been there.
hide back button with bellow code...
[self.navigationItem setHidesBackButton:YES animated:YES];
or
[self.navigationItem setHidesBackButton:YES];
Also if you have custom UINavigationBar
then try bellow code
self.navigationItem.leftBarButtonItem = nil;
Check Enable Live Templates and leave the cursor at the position desired and click Apply then OK
I had the exact same problem and since I read somewhere that the error was caused by a cached file, I fixed it by deleting all the files under the .m2 repository folder. The next time I built the project I had to download all the dependencies again but it was worth it - 0 errors!!
For me, I had ~6 different Nuget packages to update and when I selected Microsoft.AspNetCore.All first, I got the referenced error.
I started at the bottom and updated others first (EF Core, EF Design Tools, etc), then when the only one that was left was Microsoft.AspNetCore.All it worked fine.
You can manually set xticks (and yticks) using pyplot.xticks:
import matplotlib.pyplot as plt
import numpy as np
x = np.array([0,1,2,3])
y = np.array([20,21,22,23])
my_xticks = ['John','Arnold','Mavis','Matt']
plt.xticks(x, my_xticks)
plt.plot(x, y)
plt.show()
The use-case for CORS is simple. Imagine the site alice.com has some data that the site bob.com wants to access. This type of request traditionally wouldn’t be allowed under the browser’s same origin policy. However, by supporting CORS requests, alice.com can add a few special response headers that allows bob.com to access the data. In order to understand it well, please visit this nice tutorial.. How to solve the issue of CORS
Consider the following code:
class X():
def __init__(self):
print("X")
class Y(X):
def __init__(self):
# X.__init__(self)
super(Y, self).__init__()
print("Y")
class P(X):
def __init__(self):
super(P, self).__init__()
print("P")
class Q(Y, P):
def __init__(self):
super(Q, self).__init__()
print("Q")
Q()
If change constructor of Y
to X.__init__
, you will get:
X
Y
Q
But using super(Y, self).__init__()
, you will get:
X
P
Y
Q
And P
or Q
may even be involved from another file which you don't know when you writing X
and Y
. So, basically, you won't know what super(Child, self)
will reference to when you are writing class Y(X)
, even the signature of Y is as simple as Y(X)
. That's why super could be a better choice.
The way you declare the date property as an input looks incorrect but its hard to say if it's the only problem without seeing all your code. Rather than using @Input('date')
declare the date property like so: private _date: string;
. Also, make sure you are instantiating the model with the new
keyword. Lastly, access the property using regular dot notation.
Check your work against this example from https://www.typescriptlang.org/docs/handbook/classes.html :
let passcode = "secret passcode";
class Employee {
private _fullName: string;
get fullName(): string {
return this._fullName;
}
set fullName(newName: string) {
if (passcode && passcode == "secret passcode") {
this._fullName = newName;
}
else {
console.log("Error: Unauthorized update of employee!");
}
}
}
let employee = new Employee();
employee.fullName = "Bob Smith";
if (employee.fullName) {
console.log(employee.fullName);
}
And here is a plunker demonstrating what it sounds like you're trying to do: https://plnkr.co/edit/OUoD5J1lfO6bIeME9N0F?p=preview
Try this query:
SELECT SUBSTRING(CONVERT(VARCHAR,JOINGDATE,103),7,4)AS
YEAR,SUBSTRING(CONVERT(VARCHAR,JOINGDATE,100),1,2)AS
MONTH,SUBSTRING(CONVERT(VARCHAR,JOINGDATE,100),4,3)AS DATE FROM EMPLOYEE1
Result:
2014 Ja 1
2015 Ja 1
2014 Ja 1
2015 Ja 1
2012 Ja 1
2010 Ja 1
2015 Ja 1
I struggled with the same problem. I have stored dates in SQL Server with format 'YYYY-MM-DD HH:NN:SS' for about 20 years, but today that was not able anymore from a C# solution using OleDbCommand and a UPDATE query.
The solution to my problem was to remove the hyphen - in the format, so the resulting formatting is now 'YYYYMMDD HH:MM:SS'. I have no idea why my previous formatting not works anymore, but I suspect there is something to do with some Windows updates for ADO.
For those using the context menu api
, the docs are not immediately clear on how to obtain tab information.
chrome.contextMenus.onClicked.addListener(function(info, tab) {
console.log(info);
return console.log(tab);
});
You need to have a subquery to get their latest date per user ID
.
SELECT a.*, c.*
FROM users a
INNER JOIN payments c
ON a.id = c.user_ID
INNER JOIN
(
SELECT user_ID, MAX(date) maxDate
FROM payments
GROUP BY user_ID
) b ON c.user_ID = b.user_ID AND
c.date = b.maxDate
WHERE a.package = 1
Checking the header file solve's the problem. One can check for there system compiler.
For my system , AF_INET == PF_INET
AF == Address Family And PF == Protocol Family
Protocol families, same as address families.
I know this is an old question, but nobody mentioned that when your data looks like an array, numpy's loadtxt comes in handy:
>>> import numpy as np
>>> np.loadtxt("myfile.txt")[:, 1]
array([10., 20., 30., 40., 23., 13.])
You can use "tilde" operator to do it:
import cv2
image = cv2.imread("img.png")
image = ~image
cv2.imwrite("img_inv.png",image)
This is because the "tilde" operator (also known as unary operator) works doing a complement dependent on the type of object
for example for integers, its formula is:
x + (~x) = -1
but in this case, opencv use an "uint8 numpy array object" for its images so its range is from 0 to 255
so if we apply this operator to an "uint8 numpy array object" like this:
import numpy as np
x1 = np.array([25,255,10], np.uint8) #for example
x2 = ~x1
print (x2)
we will have as a result:
[230 0 245]
because its formula is:
x2 = 255 - x1
and that is exactly what we want to do to solve the problem.
I resolved by removing @Basic(optional = false) property or just update boolean @Basic(optional = true)
Aside from looking into root cause issues like file leaks, etc. in order to do a legitimate increase the "open files" limit and have that persist across reboots, consider editing
/etc/security/limits.conf
by adding something like this
jetty soft nofile 2048
jetty hard nofile 4096
where "jetty" is the username in this case. For more details on limits.conf, see http://linux.die.net/man/5/limits.conf
log off and then log in again and run
ulimit -n
to verify that the change has taken place. New processes by this user should now comply with this change. This link seems to describe how to apply the limit on already running processes but I have not tried it.
The default limit 1024 can be too low for large Java applications.
Go to a Packages/User
, create (or edit) a .sublime-settings
file named after the Syntax where you want to add the extensions, Ini.sublime-settings
in your case, then write there something like this:
{
"extensions":["cfg"]
}
And then restart Sublime Text
It's not possible. Please, vote for the bug.
Welcome to Java! This Nodes are like a blocks, they must be assembled to do amazing things! In this particular case, your nodes can represent a list, a linked list, You can see an example here:
public class ItemLinkedList {
private ItemInfoNode head;
private ItemInfoNode tail;
private int size = 0;
public int getSize() {
return size;
}
public void addBack(ItemInfo info) {
size++;
if (head == null) {
head = new ItemInfoNode(info, null, null);
tail = head;
} else {
ItemInfoNode node = new ItemInfoNode(info, null, tail);
this.tail.next =node;
this.tail = node;
}
}
public void addFront(ItemInfo info) {
size++;
if (head == null) {
head = new ItemInfoNode(info, null, null);
tail = head;
} else {
ItemInfoNode node = new ItemInfoNode(info, head, null);
this.head.prev = node;
this.head = node;
}
}
public ItemInfo removeBack() {
ItemInfo result = null;
if (head != null) {
size--;
result = tail.info;
if (tail.prev != null) {
tail.prev.next = null;
tail = tail.prev;
} else {
head = null;
tail = null;
}
}
return result;
}
public ItemInfo removeFront() {
ItemInfo result = null;
if (head != null) {
size--;
result = head.info;
if (head.next != null) {
head.next.prev = null;
head = head.next;
} else {
head = null;
tail = null;
}
}
return result;
}
public class ItemInfoNode {
private ItemInfoNode next;
private ItemInfoNode prev;
private ItemInfo info;
public ItemInfoNode(ItemInfo info, ItemInfoNode next, ItemInfoNode prev) {
this.info = info;
this.next = next;
this.prev = prev;
}
public void setInfo(ItemInfo info) {
this.info = info;
}
public void setNext(ItemInfoNode node) {
next = node;
}
public void setPrev(ItemInfoNode node) {
prev = node;
}
public ItemInfo getInfo() {
return info;
}
public ItemInfoNode getNext() {
return next;
}
public ItemInfoNode getPrev() {
return prev;
}
}
}
EDIT:
Declare ItemInfo as this:
public class ItemInfo {
private String name;
private String rfdNumber;
private double price;
private String originalPosition;
public ItemInfo(){
}
public ItemInfo(String name, String rfdNumber, double price, String originalPosition) {
this.name = name;
this.rfdNumber = rfdNumber;
this.price = price;
this.originalPosition = originalPosition;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRfdNumber() {
return rfdNumber;
}
public void setRfdNumber(String rfdNumber) {
this.rfdNumber = rfdNumber;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public String getOriginalPosition() {
return originalPosition;
}
public void setOriginalPosition(String originalPosition) {
this.originalPosition = originalPosition;
}
}
Then, You can use your nodes inside the linked list like this:
public static void main(String[] args) {
ItemLinkedList list = new ItemLinkedList();
for (int i = 1; i <= 10; i++) {
list.addBack(new ItemInfo("name-"+i, "rfd"+i, i, String.valueOf(i)));
}
while (list.size() > 0){
System.out.println(list.removeFront().getName());
}
}
<!--ForExport data in iamge -->
<script type="text/javascript">
function ConvertToImage(btnExport) {
html2canvas($("#dvTable")[0]).then(function (canvas) {
var base64 = canvas.toDataURL();
$("[id*=hfImageData]").val(base64);
__doPostBack(btnExport.name, "");
});
return false;
}
</script>
<!--ForExport data in iamge -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script src="../js/html2canvas.min.js"></script>
<table>
<tr>
<td valign="top">
<asp:Button ID="btnExport" Text="Download Back" runat="server" UseSubmitBehavior="false"
OnClick="ExportToImage" OnClientClick="return ConvertToImage(this)" />
<div id="dvTable" class="divsection2" style="width: 350px">
<asp:HiddenField ID="hfImageData" runat="server" />
<table width="100%">
<tr>
<td>
<br />
</td>
</tr>
<tr>
<td>
<asp:Label ID="Labelgg" runat="server" CssClass="labans4" Text=""></asp:Label>
</td>
</tr>
</table>
</div>
</td>
</tr>
</table>
protected void ExportToImage(object sender, EventArgs e)
{
string base64 = Request.Form[hfImageData.UniqueID].Split(',')[1];
byte[] bytes = Convert.FromBase64String(base64);
Response.Clear();
Response.ContentType = "image/png";
Response.AddHeader("Content-Disposition", "attachment; filename=name.png");
Response.Buffer = true;
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.BinaryWrite(bytes);
Response.End();
}
I finally ended using the following :
bower install --save http://twitter.github.com/bootstrap/assets/bootstrap.zip
Seems cleaner to me since it doesn't clone the whole repo, it only unzip the required assests.
The downside of that is that it breaks the bower philosophy since a bower update
will not update bootstrap.
But I think it's still cleaner than using bower install bootstrap
and then building bootstrap in your workflow.
It's a matter of choice I guess.
Update : seems they now version a dist folder (see: https://github.com/twbs/bootstrap/pull/6342), so just use bower install bootstrap
and point to the assets in the dist
folder
If you need all the foreign keys of the user then use the following script
SELECT a.constraint_name, a.table_name, a.column_name, c.owner,
c_pk.table_name r_table_name, b.column_name r_column_name
FROM user_cons_columns a
JOIN user_constraints c ON a.owner = c.owner
AND a.constraint_name = c.constraint_name
JOIN user_constraints c_pk ON c.r_owner = c_pk.owner
AND c.r_constraint_name = c_pk.constraint_name
JOIN user_cons_columns b ON C_PK.owner = b.owner
AND C_PK.CONSTRAINT_NAME = b.constraint_name AND b.POSITION = a.POSITION
WHERE c.constraint_type = 'R'
based on Vincent Malgrat code
To add to the accepted answer, I had a similar issue and solved it using a similar approach with the contrived example below. In this case I needed to log some parameters on componentWillUnmount
and as described in the original question I didn't want it to log every time the params changed.
const componentWillUnmount = useRef(false)
// This is componentWillUnmount
useEffect(() => {
return () => {
componentWillUnmount.current = true
}
}, [])
useEffect(() => {
return () => {
// This line only evaluates to true after the componentWillUnmount happens
if (componentWillUnmount.current) {
console.log(params)
}
}
}, [params]) // This dependency guarantees that when the componentWillUnmount fires it will log the latest params
No you don't need to call the base destructor, a base destructor is always called for you by the derived destructor. Please see my related answer here for order of destruction.
To understand why you want a virtual destructor in the base class, please see the code below:
class B
{
public:
virtual ~B()
{
cout<<"B destructor"<<endl;
}
};
class D : public B
{
public:
virtual ~D()
{
cout<<"D destructor"<<endl;
}
};
When you do:
B *pD = new D();
delete pD;
Then if you did not have a virtual destructor in B, only ~B() would be called. But since you have a virtual destructor, first ~D() will be called, then ~B().
I'd rather use jQuery:
$('#'+formID).find(':input').attr('disabled', 'disabled');
find() would go much deeper till nth nested child than children(), which looks for immediate children only.
If you don't need full debugging support, you can now view JavaScript console logs directly within Chrome for iOS at chrome://inspect.
https://blog.chromium.org/2019/03/debugging-websites-in-chrome-for-ios.html
You might want to have a look at
Redis Simple Message Queue for Node.js
Which uses Redis and offers most features of Amazons SQS.
I'm going on a bit of an assumption here, but I'm assuming the logic inside the procedure gets split up via task. And you cant have nullable parameters as @Yuck suggested because of the dynamics of the parameters?
So going by my assumption
If TaskName = "Path1" Then Something
If TaskName = "Path2" Then Something Else
My initial thought is, if you have separate functions with business-logic you need to create, and you can determine that you have say 5-10 different scenarios, rather write individual stored procedures as needed, instead of trying one huge one solution fits all approach. Might get a bit messy to maintain.
But if you must...
Why not try dynamic SQL, as suggested by @E.J Brennan (Forgive me, i haven't touched SQL in a while so my syntax might be rusty) That being said i don't know if its the best approach, but could this could possibly meet your needs?
CREATE PROCEDURE GetTaskEvents
@TaskName varchar(50)
@Values varchar(200)
AS
BEGIN
DECLARE @SQL VARCHAR(MAX)
IF @TaskName = 'Something'
BEGIN
@SQL = 'INSERT INTO.....' + CHAR(13)
@SQL += @Values + CHAR(13)
END
IF @TaskName = 'Something Else'
BEGIN
@SQL = 'DELETE SOMETHING WHERE' + CHAR(13)
@SQL += @Values + CHAR(13)
END
PRINT(@SQL)
EXEC(@SQL)
END
(The CHAR(13) adds a new line.. an old habbit i picked up somewhere, used to help debugging/reading dynamic procedures when running SQL profiler.)
By default, the classes in the csv
module use Windows-style line terminators (\r\n
) rather than Unix-style (\n
). Could this be what’s causing the apparent double line breaks?
If so, you can override it in the DictWriter
constructor:
output = csv.DictWriter(open('file3.csv','w'), delimiter=',', lineterminator='\n', fieldnames=headers)
Put your domain name here: https://www.ssllabs.com/ssltest/analyze.html You should be able to see if there are any issues with your ssl certificate chain. I am guessing that you have SSL chain issues. A short description of the problem is that there's actually a list of certificates on your server (and not only one) and these need to be in the correct order. If they are there but not in the correct order, the website will be fine on desktop browsers (an iOs as well I think), but android is more strict about the order of certificates, and will give an error if the order is incorrect. To fix this you just need to re-order the certificates.
function checkChange($this){
var value = $this.val();
var sv=$this.data("stored");
if(value!=sv)
$this.trigger("simpleChange");
}
$(document).ready(function(){
$(this).data("stored",$(this).val());
$("input").bind("keyup",function(e){
checkChange($(this));
});
$("input").bind("simpleChange",function(e){
alert("the value is chaneged");
});
});
here is the fiddle http://jsfiddle.net/Q9PqT/1/
With the perspective of the OS X v10.7 and iOS 5 launches, probably the first thing to recommend now is NSJSONSerialization
, Apple's supplied JSON parser. Use third-party options only as a fallback if you find that class unavailable at runtime.
So, for example:
NSData *returnedData = ...JSON data, probably from a web request...
// probably check here that returnedData isn't nil; attempting
// NSJSONSerialization with nil data raises an exception, and who
// knows how your third-party library intends to react?
if(NSClassFromString(@"NSJSONSerialization"))
{
NSError *error = nil;
id object = [NSJSONSerialization
JSONObjectWithData:returnedData
options:0
error:&error];
if(error) { /* JSON was malformed, act appropriately here */ }
// the originating poster wants to deal with dictionaries;
// assuming you do too then something like this is the first
// validation step:
if([object isKindOfClass:[NSDictionary class]])
{
NSDictionary *results = object;
/* proceed with results as you like; the assignment to
an explicit NSDictionary * is artificial step to get
compile-time checking from here on down (and better autocompletion
when editing). You could have just made object an NSDictionary *
in the first place but stylistically you might prefer to keep
the question of type open until it's confirmed */
}
else
{
/* there's no guarantee that the outermost object in a JSON
packet will be a dictionary; if we get here then it wasn't,
so 'object' shouldn't be treated as an NSDictionary; probably
you need to report a suitable error condition */
}
}
else
{
// the user is using iOS 4; we'll need to use a third-party solution.
// If you don't intend to support iOS 4 then get rid of this entire
// conditional and just jump straight to
// NSError *error = nil;
// [NSJSONSerialization JSONObjectWithData:...
}
Try adding a reference to the missing dll's from your service/web project directly. Adding the references to a different project didn't work for me.
I only had to do this when publishing my web app because it wasn't copying all the required dll's.
Prerequisite:
Aria is used to improve the user experience of visually impaired users. Visually impaired users navigate though application using screen reader software like JAWS, NVDA,.. While navigating through the application, screen reader software announces content to users. Aria can be used to add content in the code which helps screen reader users understand role, state, label and purpose of the control
Aria does not change anything visually. (Aria is scared of designers too).
aria-label
aria-label attribute is used to communicate the label to screen reader users. Usually search input field does not have visual label (thanks to designers). aria-label can be used to communicate the label of control to screen reader users
How To Use:
<input type="edit" aria-label="search" placeholder="search">
There is no visual change in application. But screen readers can understand the purpose of control
aria-labelledby
Both aria-label and aria-labelledby is used to communicate the label. But aria-labelledby can be used to reference any label already present in the page whereas aria-label is used to communicate the label which i not displayed visually
Approach 1:
<span id="sd">Search</span>
<input type="text" aria-labelledby="sd">
Approach 2:
aria-labelledby can also be used to combine two labels for screen reader users
<span id="de">Billing Address</span>
<span id="sd">First Name</span>
<input type="text" aria-labelledby="de sd">
I usually do it this way:
$ gcc -dM -E - < /dev/null
Note that some preprocessor defines are dependent on command line options - you can test these by adding the relevant options to the above command line. For example, to see which SSE3/SSE4 options are enabled by default:
$ gcc -dM -E - < /dev/null | grep SSE[34]
#define __SSE3__ 1
#define __SSSE3__ 1
and then compare this when -msse4
is specified:
$ gcc -dM -E -msse4 - < /dev/null | grep SSE[34]
#define __SSE3__ 1
#define __SSE4_1__ 1
#define __SSE4_2__ 1
#define __SSSE3__ 1
Similarly you can see which options differ between two different sets of command line options, e.g. compare preprocessor defines for optimisation levels -O0
(none) and -O3
(full):
$ gcc -dM -E -O0 - < /dev/null > /tmp/O0.txt
$ gcc -dM -E -O3 - < /dev/null > /tmp/O3.txt
$ sdiff -s /tmp/O0.txt /tmp/O3.txt
#define __NO_INLINE__ 1 <
> #define __OPTIMIZE__ 1
request.getSession()
will return a current session. if current session does not exist, then it will create a new one.
request.getSession(true)
will return current session. If current session does not exist, then it will create a new session.
So basically there is not difference between both method.
request.getSession(false)
will return current session if current session exists. If not, it will not create a new session.
Use this plugin http://multidatespickr.sourceforge.net
You might want to take a look at the excellent HTTP Python library called Requests. It makes every task involving HTTP a bit easier than urllib2. From Cookies section of quickstart guide:
To send your own cookies to the server, you can use the cookies parameter:
>>> cookies = dict(cookies_are='working')
>>> r = requests.get('http://httpbin.org/cookies', cookies=cookies)
>>> r.text
'{"cookies": {"cookies_are": "working"}}'
A Java String is internally always encoded in UTF-16 - but you really should think about it like this: an encoding is a way to translate between Strings and bytes.
So if you have an encoding problem, by the time you have String, it's too late to fix. You need to fix the place where you create that String from a file, DB or network connection.
For MAC:
brew install bundletool
bundletool build-apks --bundle=./app.aab --output=./app.apks
bundletool install-apks --apks=app.apks
git config --get remote.origin.url
My understanding of the Android application framework is that this is specifically not permitted. An application is closed automatically when it contains no more current activities. Trying to create a "kill" button is apparently contrary to the intended design of the application system.
To get the sort of effect you want, you could initiate your various activities with startActivityForResult(), and have the exit button send back a result which tells the parent activity to finish(). That activity could then send the same result as part of its onDestroy(), which would cascade back to the main activity and result in no running activities, which should cause the app to close.
You are using Python 2 methodology instead of Python 3.
Change:
outfile=open('./immates.csv','wb')
To:
outfile=open('./immates.csv','w')
and you will get a file with the following output:
SNo,States,Dist,Population
1,Andhra Pradesh,13,49378776
2,Arunachal Pradesh,16,1382611
3,Assam,27,31169272
4,Bihar,38,103804637
5,Chhattisgarh,19,25540196
6,Goa,2,1457723
7,Gujarat,26,60383628
.....
In Python 3 csv takes the input in text mode, whereas in Python 2 it took it in binary mode.
Edited to Add
Here is the code I ran:
url='http://www.mapsofindia.com/districts-india/'
html = urllib.request.urlopen(url).read()
soup = BeautifulSoup(html)
table=soup.find('table', attrs={'class':'tableizer-table'})
list_of_rows=[]
for row in table.findAll('tr')[1:]:
list_of_cells=[]
for cell in row.findAll('td'):
list_of_cells.append(cell.text)
list_of_rows.append(list_of_cells)
outfile = open('./immates.csv','w')
writer=csv.writer(outfile)
writer.writerow(['SNo', 'States', 'Dist', 'Population'])
writer.writerows(list_of_rows)
[0, 132, 432, 342, 234][1..-1]
=> [132, 432, 342, 234]
So unlike shift
or slice
this returns the modified array (useful for one liners).
There are two common approaches. First, you can pass System.Type
object GetColumnValue(string columnName, Type type)
{
// Here, you can check specific types, as needed:
if (type == typeof(int)) { // ...
This would be called like: int val = (int)GetColumnValue(columnName, typeof(int));
The other option would be to use generics:
T GetColumnValue<T>(string columnName)
{
// If you need the type, you can use typeof(T)...
This has the advantage of avoiding the boxing and providing some type safety, and would be called like: int val = GetColumnValue<int>(columnName);
This works, as long as you remove the height attribute from the table.
<table id="content" border="0px" cellspacing="0px" cellpadding="0px">
<tr><td height='9px' bgcolor="#990000">Upper</td></tr>
<tr><td height='100px' bgcolor="#990099">Lower</td></tr>
</table>
I had the same issue - it sorted itself out in ~3 hours after I uploaded the app to the Play console. According to Google:
Warning: It may take up to 2-3 hours after uploading the APK for Google Play to recognize your updated APK version. If you try to test your application before your uploaded APK is recognized by Google Play, your application will receive a ‘purchase cancelled’ response with an error message “This version of the application is not enabled for In-app Billing.
While the message is not the same, I suspect the root cause to be the same.
Its possible at application level. Click on the EJB under the deployment(like Home > >Summary of Deployments >). Click on the Configuration tab and there is "Transaction Timeout:"
You can use LinkedHashMap to main insertion order in Map
The important points about Java LinkedHashMap class are:
A LinkedHashMap contains values based on the key 3.It may have one null key and multiple null values. 4.It is same as HashMap instead maintains insertion order
public class LinkedHashMap<K,V> extends HashMap<K,V> implements Map<K,V>
But if you want sort values in map using User-defined object or any primitive data type key then you should use TreeMap For more information, refer this link
Updated with swift 4
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.navigationBar.tintColor = UIColor.blue
self.navigationController?.navigationBar.barStyle = UIBarStyle.black
}
Or this in windows powershell
$env:RANDFILE=".rnd"
I've read through these answers multiple times, but didn't REALLY get it until I learned about the technical definition of "Call by sharing" as termed by Barbara Liskov
The semantics of call by sharing differ from call by reference in that assignments to function arguments within the function aren't visible to the caller (unlike by reference semantics)[citation needed], so e.g. if a variable was passed, it is not possible to simulate an assignment on that variable in the caller's scope. However, since the function has access to the same object as the caller (no copy is made), mutations to those objects, if the objects are mutable, within the function are visible to the caller, which may appear to differ from call by value semantics. Mutations of a mutable object within the function are visible to the caller because the object is not copied or cloned — it is shared.
That is, parameter references are alterable if you go and access the parameter value itself. On the other hand, assignment to a parameter will disappear after evaluation, and is non-accessible to the function caller.
I'd rather use static widths and if you'd like your page to resize depending on screen size, you can have a look at media queries.
Or, you can set a min-width on elements like header, navigation, content etc.
I bet this is what was intended as a result.
$ date -u --date=@1404372514
Thu Jul 3 07:28:34 UTC 2014
Pushwatch is a free to use online GCM and APNS push notification tester developed by myself in Django/Python as I have found myself in a similar situation while working on multiple projects. It can send both GCM
and APNS
notifications and also support JSON messages for extra arguments. Following are the links to the testers.
Please let me know if you have any questions or face issues using it.
You should use promises for async operations where you don't know when it will be completed. A promise "represents an operation that hasn't completed yet, but is expected in the future." (https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise)
An example implementation would be like:
myApp.factory('myService', function($http) {
var getData = function() {
// Angular $http() and then() both return promises themselves
return $http({method:"GET", url:"/my/url"}).then(function(result){
// What we return here is the data that will be accessible
// to us after the promise resolves
return result.data;
});
};
return { getData: getData };
});
function myFunction($scope, myService) {
var myDataPromise = myService.getData();
myDataPromise.then(function(result) {
// this is only run after getData() resolves
$scope.data = result;
console.log("data.name"+$scope.data.name);
});
}
Edit: Regarding Sujoys comment that What do I need to do so that myFuction() call won't return till .then() function finishes execution.
function myFunction($scope, myService) {
var myDataPromise = myService.getData();
myDataPromise.then(function(result) {
$scope.data = result;
console.log("data.name"+$scope.data.name);
});
console.log("This will get printed before data.name inside then. And I don't want that.");
}
Well, let's suppose the call to getData() took 10 seconds to complete. If the function didn't return anything in that time, it would effectively become normal synchronous code and would hang the browser until it completed.
With the promise returning instantly though, the browser is free to continue on with other code in the meantime. Once the promise resolves/fails, the then() call is triggered. So it makes much more sense this way, even if it might make the flow of your code a bit more complex (complexity is a common problem of async/parallel programming in general after all!)
To plot an equation that is not solved for a specific variable (like circle or hyperbola):
import numpy as np
import matplotlib.pyplot as plt
plt.figure() # Create a new figure window
xlist = np.linspace(-2.0, 2.0, 100) # Create 1-D arrays for x,y dimensions
ylist = np.linspace(-2.0, 2.0, 100)
X,Y = np.meshgrid(xlist, ylist) # Create 2-D grid xlist,ylist values
F = X**2 + Y**2 - 1 # 'Circle Equation
plt.contour(X, Y, F, [0], colors = 'k', linestyles = 'solid')
plt.show()
More about it: http://courses.csail.mit.edu/6.867/wiki/images/3/3f/Plot-python.pdf
You can also use Parser() from html-react-parser. I have used the same. Link shared.
I use to have that problem, but the simples way to fix it is this (this works for me):
on the CSS file type:
body{overflow-y:scroll;}
as that simple! :)
I had the same problem before and i fixed it by creating the same table in a new sheet and deleting all the name ranges associated to the table, i believe whene you're using listobjects you're not alowed to have name ranges contained within your table hope that helps thanks
If you create a boilerplate folder for your JS projects so that you can use JS Modules, webpack
and Babel
are great tools.
Don't install webpack
globally and after installing the most recent versions of both, your package.json
file will be loaded up and ready to copy for future projects.
Make sure to delete the node_modules
folder to decrease file size in your boilerplate folder and then to reinstall node_modules use npm install
.
I forgot to run npm install and kept getting this error when trying to run my webpack dev-server until I realized I needed to run npm install
to install node_modules
and then it worked.
It could happen if your classpath is not correct
Let us posit a serializable class and deserializable class under same projectname. You run the serializable class, creating a serializable object in specific folder. Now you need the desearialized data. In the meantime, if you change the name of the project it will not work. You have to run the serializable class first and then deserialize the file.
color
and fill
are separate aesthetics. Since you want to modify the color you need to use the corresponding scale:
d + scale_color_manual(values=c("#CC6666", "#9999CC"))
is what you want.
The last-child
selector is used to select the last child element of a parent. It cannot be used to select the last child element with a specific class under a given parent element.
The other part of the compound selector (which is attached before the :last-child
) specifies extra conditions which the last child element must satisfy in-order for it to be selected. In the below snippet, you would see how the selected elements differ depending on the rest of the compound selector.
.parent :last-child{ /* this will select all elements which are last child of .parent */_x000D_
font-weight: bold;_x000D_
}_x000D_
_x000D_
.parent div:last-child{ /* this will select the last child of .parent only if it is a div*/_x000D_
background: crimson;_x000D_
}_x000D_
_x000D_
.parent div.child-2:last-child{ /* this will select the last child of .parent only if it is a div and has the class child-2*/_x000D_
color: beige;_x000D_
}
_x000D_
<div class='parent'>_x000D_
<div class='child'>Child</div>_x000D_
<div class='child'>Child</div>_x000D_
<div class='child'>Child</div>_x000D_
<div>Child w/o class</div>_x000D_
</div>_x000D_
<div class='parent'>_x000D_
<div class='child'>Child</div>_x000D_
<div class='child'>Child</div>_x000D_
<div class='child'>Child</div>_x000D_
<div class='child-2'>Child w/o class</div>_x000D_
</div>_x000D_
<div class='parent'>_x000D_
<div class='child'>Child</div>_x000D_
<div class='child'>Child</div>_x000D_
<div class='child'>Child</div>_x000D_
<p>Child w/o class</p>_x000D_
</div>
_x000D_
To answer your question, the below would style the last child li
element with background color as red.
li:last-child{
background-color: red;
}
But the following selector would not work for your markup because the last-child
does not have the class='complete'
even though it is an li
.
li.complete:last-child{
background-color: green;
}
It would have worked if (and only if) the last li
in your markup also had class='complete'
.
To address your query in the comments:
@Harry I find it rather odd that: .complete:last-of-type does not work, yet .complete:first-of-type does work, regardless of it's position it's parents element. Thanks for your help.
The selector .complete:first-of-type
works in the fiddle because it (that is, the element with class='complete'
) is still the first element of type li
within the parent. Try to add <li>0</li>
as the first element under the ul
and you will find that first-of-type
also flops. This is because the first-of-type
and last-of-type
selectors select the first/last element of each type under the parent.
Refer to the answer posted by BoltClock, in this thread for more details about how the selector works. That is as comprehensive as it gets :)
Yes, you can do that, but only if #b
is after #a
in the HTML.
If #b
comes immediately after #a
: http://jsfiddle.net/u7tYE/
#a:hover + #b {
background: #ccc
}
<div id="a">Div A</div>
<div id="b">Div B</div>
That's using the adjacent sibling combinator (+
).
If there are other elements between #a
and #b
, you can use this: http://jsfiddle.net/u7tYE/1/
#a:hover ~ #b {
background: #ccc
}
<div id="a">Div A</div>
<div>random other elements</div>
<div>random other elements</div>
<div>random other elements</div>
<div id="b">Div B</div>
That's using the general sibling combinator (~
).
Both +
and ~
work in all modern browsers and IE7+
If #b
is a descendant of #a
, you can simply use #a:hover #b
.
ALTERNATIVE: You can use pure CSS to do this by positioning the second element before the first. The first div is first in markup, but positioned to the right or below the second. It will work as if it were a previous sibling.
select columns
from table
where (
column like 'a%'
or column like 'b%' )
order by column asc
This happens because your click
handler fires before the value of the radio button changes. You need to listen to the change
event instead:
<input
type="radio"
name="optionsRadios"
id="optionsRadios2"
value=""
v-model="srStatus"
v-on:change="foo"> //here
Also, make sure you really want to call foo()
on ready... seems like maybe you don't actually want to do that.
ready:function(){
foo();
},
If I'm not mistaken it is:
MyArray.SetValue(ArrayElement, PositionInArray)
Use the std::getline()
from <string>
.
istream & getline(istream & is,std::string& str)
So, for your case it would be:
std::getline(read,x);
http://api.jquery.com/jQuery.unique/
var cleanArray = $.unique(clutteredArray);
you might be interested in makeArray too
The previous example is best in saying that check if it exists before pushing. I see in hindsight it also states you can declare it as part of the prototype (I guess that's aka Class Extension), so no big enhancement below.
Except I'm not sure if indexOf is a faster route then inArray? probably.
Array.prototype.pushUnique = function (item){
if(this.indexOf(item) == -1) {
//if(jQuery.inArray(item, this) == -1) {
this.push(item);
return true;
}
return false;
}
From the DevTools console, you can run:
document.getElementsByTagName("head")[0].innerHTML += '<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"><\/script>';
Check the available jQuery version at https://code.jquery.com/jquery/.
To check whether it's loaded, see: Checking if jquery is loaded using Javascript.
Python test performing same multiplication 100 million times against the same random numbers.
>>> from timeit import timeit
>>> setup_str = 'import scipy; from scipy import random; scipy.random.seed(0)'
>>> N = 10*1000*1000
>>> timeit('x=random.randint(65536);', setup=setup_str, number=N)
1.894096851348877 # Time from generating the random #s and no opperati
>>> timeit('x=random.randint(65536); x*2', setup=setup_str, number=N)
2.2799630165100098
>>> timeit('x=random.randint(65536); x << 1', setup=setup_str, number=N)
2.2616429328918457
>>> timeit('x=random.randint(65536); x*10', setup=setup_str, number=N)
2.2799630165100098
>>> timeit('x=random.randint(65536); (x << 3) + (x<<1)', setup=setup_str, number=N)
2.9485139846801758
>>> timeit('x=random.randint(65536); x // 2', setup=setup_str, number=N)
2.490908145904541
>>> timeit('x=random.randint(65536); x / 2', setup=setup_str, number=N)
2.4757170677185059
>>> timeit('x=random.randint(65536); x >> 1', setup=setup_str, number=N)
2.2316000461578369
So in doing a shift rather than multiplication/division by a power of two in python, there's a slight improvement (~10% for division; ~1% for multiplication). If its a non-power of two, there's likely a considerable slowdown.
Again these #s will change depending on your processor, your compiler (or interpreter -- did in python for simplicity).
As with everyone else, don't prematurely optimize. Write very readable code, profile if its not fast enough, and then try to optimize the slow parts. Remember, your compiler is much better at optimization than you are.
Perhaps the easiest way:
ByteArrayOutputStream output = new ByteArrayOutputStream();
output.write(ciphertext);
output.write(mac);
byte[] out = output.toByteArray();
There are so many ways to iterate over the rows in Pandas dataframe. One very simple and intuitive way is:
df = pd.DataFrame({'A':[1, 2, 3], 'B':[4, 5, 6], 'C':[7, 8, 9]})
print(df)
for i in range(df.shape[0]):
# For printing the second column
print(df.iloc[i, 1])
# For printing more than one columns
print(df.iloc[i, [0, 2]])
What is currentWorksheet
? It works if you use the built-in ActiveSheet
.
dataStartRow=1
dataStartCol=1
dataEndRow=4
dataEndCol=4
Set currentWorksheet=ActiveSheet
dataTable = currentWorksheet.Range(currentWorksheet.Cells(dataStartRow, dataStartCol), currentWorksheet.Cells(dataEndRow, dataEndCol))
first use this:
LayoutInflater inflater = (LayoutInflater) Read_file.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Read file is current activity in which you want your context.
View layout = inflater.inflate(R.layout.your_layout_name,(ViewGroup)findViewById(R.id.layout_name_id));
then you can use this to find any element in layout.
ImageView myImage = (ImageView) layout.findViewById(R.id.my_image);
Use align-items: flex-start
on the container, or align-self: flex-start
on the flex items.
No need for display: inline-flex
.
An initial setting of a flex container is align-items: stretch
. This means that flex items will expand to cover the full length of the container along the cross axis.
The align-self
property does the same thing as align-items
, except that align-self
applies to flex items while align-items
applies to the flex container.
By default, align-self
inherits the value of align-items
.
Since your container is flex-direction: column
, the cross axis is horizontal, and align-items: stretch
is expanding the child element's width as much as it can.
You can override the default with align-items: flex-start
on the container (which is inherited by all flex items) or align-self: flex-start
on the item (which is confined to the single item).
Learn more about flex alignment along the cross axis here:
Learn more about flex alignment along the main axis here:
I like Keith Hill's answer except it has a bug that prevents it from recursing past two levels. These commands manifest the bug:
New-Item level1/level2/level3/level4/foobar.txt -Force -ItemType file
cd level1
GetFiles . xyz | % { $_.fullname }
With Hill's original code you get this:
...\level1\level2
...\level1\level2\level3
Here is a corrected, and slightly refactored, version:
function GetFiles($path = $pwd, [string[]]$exclude)
{
foreach ($item in Get-ChildItem $path)
{
if ($exclude | Where {$item -like $_}) { continue }
$item
if (Test-Path $item.FullName -PathType Container)
{
GetFiles $item.FullName $exclude
}
}
}
With that bug fix in place you get this corrected output:
...\level1\level2
...\level1\level2\level3
...\level1\level2\level3\level4
...\level1\level2\level3\level4\foobar.txt
I also like ajk's answer for conciseness though, as he points out, it is less efficient. The reason it is less efficient, by the way, is because Hill's algorithm stops traversing a subtree when it finds a prune target while ajk's continues. But ajk's answer also suffers from a flaw, one I call the ancestor trap. Consider a path such as this that includes the same path component (i.e. subdir2) twice:
\usr\testdir\subdir2\child\grandchild\subdir2\doc
Set your location somewhere in between, e.g. cd \usr\testdir\subdir2\child
, then run ajk's algorithm to filter out the lower subdir2
and you will get no output at all, i.e. it filters out everything because of the presence of subdir2
higher in the path. This is a corner case, though, and not likely to be hit often, so I would not rule out ajk's solution due to this one issue.
Nonetheless, I offer here a third alternative, one that does not have either of the above two bugs. Here is the basic algorithm, complete with a convenience definition for the path or paths to prune--you need only modify $excludeList
to your own set of targets to use it:
$excludeList = @("stuff","bin","obj*")
Get-ChildItem -Recurse | % {
$pathParts = $_.FullName.substring($pwd.path.Length + 1).split("\");
if ( ! ($excludeList | where { $pathParts -like $_ } ) ) { $_ }
}
My algorithm is reasonably concise but, like ajk's, it is less efficient than Hill's (for the same reason: it does not stop traversing subtrees at prune targets). However, my code has an important advantage over Hill's--it can pipeline! It is therefore amenable to fit into a filter chain to make a custom version of Get-ChildItem while Hill's recursive algorithm, through no fault of its own, cannot. ajk's algorithm can be adapted to pipeline use as well, but specifying the item or items to exclude is not as clean, being embedded in a regular expression rather than a simple list of items that I have used.
I have packaged my tree pruning code into an enhanced version of Get-ChildItem. Aside from my rather unimaginative name--Get-EnhancedChildItem--I am excited about it and have included it in my open source Powershell library. It includes several other new capabilities besides tree pruning. Furthermore, the code is designed to be extensible: if you want to add a new filtering capability, it is straightforward to do. Essentially, Get-ChildItem is called first, and pipelined into each successive filter that you activate via command parameters. Thus something like this...
Get-EnhancedChildItem –Recurse –Force –Svn
–Exclude *.txt –ExcludeTree doc*,man -FullName -Verbose
... is converted internally into this:
Get-ChildItem | FilterExcludeTree | FilterSvn | FilterFullName
Each filter must conform to certain rules: accepting FileInfo and DirectoryInfo objects as inputs, generating the same as outputs, and using stdin and stdout so it may be inserted in a pipeline. Here is the same code refactored to fit these rules:
filter FilterExcludeTree()
{
$target = $_
Coalesce-Args $Path "." | % {
$canonicalPath = (Get-Item $_).FullName
if ($target.FullName.StartsWith($canonicalPath)) {
$pathParts = $target.FullName.substring($canonicalPath.Length + 1).split("\");
if ( ! ($excludeList | where { $pathParts -like $_ } ) ) { $target }
}
}
}
The only additional piece here is the Coalesce-Args function (found in this post by Keith Dahlby), which merely sends the current directory down the pipe in the event that the invocation did not specify any paths.
Because this answer is getting somewhat lengthy, rather than go into further detail about this filter, I refer the interested reader to my recently published article on Simple-Talk.com entitled Practical PowerShell: Pruning File Trees and Extending Cmdlets where I discuss Get-EnhancedChildItem at even greater length. One last thing I will mention, though, is another function in my open source library, New-FileTree, that lets you generate a dummy file tree for testing purposes so you can exercise any of the above algorithms. And when you are experimenting with any of these, I recommend piping to % { $_.fullname }
as I did in the very first code fragment for more useful output to examine.
Use ld.charAt(0)
. It will return the first char
of the String
.
With ld.substring(0, 1)
, you can get the first character as String
.
You can get column type of DataTable with DataType attribute of datatable column like below:
var type = dt.Columns[0].DataType
dt : DataTable object.
0 : DataTable column index.
Hope It Helps
Ty :)
I needed to make a ListView
with items of different colors. I modified Shardul's method a bit and result in this:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
this, android.R.layout.simple_list_item_1, colorString) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView textView = (TextView) super.getView(position, convertView, parent);
textView.setBackgroundColor(assignBackgroundColor(position));
textView.setTextColor(assignTextColor(position));
return textView;
}
};
colorList.setAdapter(adapter);
assignBackgroundColor()
and assignTextColor()
are methods that assign color you want. They can be replaced with int[]
arrays.
I found that in the Preferences
, there is no fonts and colors
selection. Guess the version is different, following is the one that works for the latest version.
Method 1
Xcode
-> Preferences
Themes
T
symbol in the middle of the fontMethod 2
Simply adjust with cmd +
or cmd -
android:inputMethod
is deprecated, instead use inputType
:
android:inputType="numberPassword"
keep your emulator up and running. In the command line, go inside the platform-tools folder, in your sdk folder which come with adt bundle and execute following command :
>adb install <yourFilename.apk>
This command detect your running emulator/emulators and show you the list of devices where you can install this app(show if any physical device/devices connected to your computer.). Then you can select any one, if only one emulator is running then app will directly installed on it by default.
Note: For above command your .apk file needs to be in same directory.
for more detailed tutorial follo : This link
If you want something like global constants; a quick an dirty way is to put the constant declarations into the pch
file.
Here is what I did to solve just by 2 ways:
make ID column as int
type
if you are using autogenerate in ID dont assing value in the setter of ID. If your mapping the some then sometimes autogenetated ID is not concedered. (I dont know why)
try using @GeneratedValue(strategy=GenerationType.SEQUENCE)
if possible
Try to use Catalano Framework.
Keypoints:
The Catalano Framework is a framework for scientific computing for Java and Android. The project started as an initial port of the many features of the AForge.NET and Accord.NET frameworks for .NET, but is steadily growing with more advanced features which are now being shared between those projects.
Example:
FastBitmap fb = new FastBitmap(bitmap);
Grayscale g = new Grayscale();
g.applyInPlace(fb);
Threshold t = new Threshold(120);
t.applyInPlace(fb);
bitmap = fb.toBitmap();
//Show the result
You can use CSS3 scale
property to resize image with css:
.image:hover {
-webkit-transform:scale(1.2);
transform:scale(1.2);
}
.image {
-webkit-transition: all 0.7s ease;
transition: all 0.7s ease;
}
Further Reading:
All answers did show a programmatic and general approach. I suggest a mathematical approach specific for your case. It can be faster in particular for long lists. It works because your list is a list of natural numbers up to n
:
Let's assume we have the natural numbers 1, 2, 3, ..., 10
:
>>> nat_seq = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
You can use the sum
function on a list:
>>> print sum(nat_seq)
55
You can also use the formula n*(n+1)/2
where n
is the value of the last element in the list (here: nat_seq[-1]
), so you avoid iterating over elements:
>>> print (nat_seq[-1]*(nat_seq[-1]+1))/2
55
To generate the sequence (1+2)/2, (2+3)/2, ..., (9+10)/2
you can use a generator and the formula (2*k-1)/2.
(note the dot to make the values floating points). You have to skip the first element when generating the new list:
>>> new_seq = [(2*k-1)/2. for k in nat_seq[1:]]
>>> print new_seq
[1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5]
Here too, you can use the sum
function on that list:
>>> print sum(new_seq)
49.5
But you can also use the formula (((n*2+1)/2)**2-1)/2
, so you can avoid iterating over elements:
>>> print (((new_seq[-1]*2+1)/2)**2-1)/2
49.5