How to add an element to a list?

Question

From this..

data = json.loads(urlopen('someurl').read())

...I will get:

{'list': [{'a':'1'}]}

I want to add {'b':'2'} into the list.

Any idea how to do it?

Answer 1

I would do this:

data["list"].append({'b':'2'})

so simply you are adding an object to the list that is present in "data"

Answer 2

Elements are added to list using append():

>>> data = {'list': [{'a':'1'}]}
>>> data['list'].append({'b':'2'})
>>> data
{'list': [{'a': '1'}, {'b': '2'}]}

If you want to add element to a specific place in a list (i.e. to the beginning), use insert() instead:

>>> data['list'].insert(0, {'b':'2'})
>>> data
{'list': [{'b': '2'}, {'a': '1'}]}

After doing that, you can assemble JSON again from dictionary you modified:

>>> json.dumps(data)
'{"list": [{"b": "2"}, {"a": "1"}]}'