How to add key,value pair to dictionary?.Below i have mentioned following format?
{'1_somemessage': [[3L,
1L,
u'AAA',
1689544L,
datetime.datetime(2010, 9, 21, 22, 30),
u'gffggf'],
[3L,
1L,
u'BBB',
1689544L,
datetime.datetime(2010, 9, 21, 20, 30),
u'ffgffgfg'],
[3L,
1L,
u'CCC',
1689544L,
datetime.datetime(2010, 9, 21, 22, 30),
u'hjhjhjhj'],
[3L,
1L,
u'DDD',
1689544L,
datetime.datetime(2010, 9, 21, 21, 45),
u'jhhjjh']],
'2_somemessage': [[4L,
1L,
u'AAA',
1689544L,
datetime.datetime(2010, 9, 21, 22, 30),
u'gffggf'],
[4L,
1L,
u'BBB',
1689544L,
datetime.datetime(2010, 9, 21, 20, 30),
u'ffgffgfg'],
[4L,
1L,
u'CCC',
1689544L,
datetime.datetime(2010, 9, 21, 22, 30),
u'hjhjhjhj'],
[4L,
1L,
u'DDD',
1689544L,
datetime.datetime(2010, 9, 21, 21, 45),
u'jhhjjh']]}
This question is related to
python
May be some time this also will be helpful
import collections
#Write you select statement here and other things to fetch the data.
if rows:
JArray = []
for row in rows:
JArray2 = collections.OrderedDict()
JArray2["id"]= str(row['id'])
JArray2["Name"]= row['catagoryname']
JArray.append(JArray2)
return json.dumps(JArray)
Example Output:
[
{
"id": 14
"Name": "someName1"
},
{
"id": 15
"Name": "someName2"
}
]
To insert/append to a dictionary
{"0": {"travelkey":"value", "travelkey2":"value"},"1":{"travelkey":"value","travelkey2":"value"}}
travel_dict={} #initialize dicitionary
travel_key=0 #initialize counter
if travel_key not in travel_dict: #for avoiding keyerror 0
travel_dict[travel_key] = {}
travel_temp={val['key']:'no flexible'}
travel_dict[travel_key].update(travel_temp) # Updates if val['key'] exists, else adds val['key']
travel_key=travel_key+1
For quick reference, all the following methods will add a new key 'a' if it does not exist already or it will update the existing key value pair with the new value offered:
data['a']=1
data.update({'a':1})
data.update(dict(a=1))
data.update(a=1)
You can also mixing them up, for example, if key 'c' is in data but 'd' is not, the following method will updates 'c' and adds 'd'
data.update({'c':3,'d':4})
I got here looking for a way to add a key/value pair(s) as a group - in my case it was the output of a function call, so adding the pair using dictionary[key] = value
would require me to know the name of the key(s).
In this case, you can use the update method:
dictionary.update(function_that_returns_a_dict(*args, **kwargs)))
Beware, if dictionary
already contains one of the keys, the original value will be overwritten.
I am not sure what you mean by "dynamic". If you mean adding items to a dictionary at runtime, it is as easy as dictionary[key] = value
.
If you wish to create a dictionary with key,value to start with (at compile time) then use (surprise!)
dictionary[key] = value
If you want to add a new record in the form
newRecord = [4L, 1L, u'DDD', 1689544L, datetime.datetime(2010, 9, 21, 21, 45), u'jhhjjh']
to messageName
where messageName
in the form X_somemessage
can, but does not have to be in your dictionary, then do it this way:
myDict.setdefault(messageName, []).append(newRecord)
This way it will be appended to an existing messageName
or a new list will be created for a new messageName
.
Add a key, value pair to dictionary
aDict = {}
aDict[key] = value
What do you mean by dynamic addition.
Source: Stackoverflow.com