list.extend
Add all the items of an iterable to the end of the list.
Python 3.13
list.extend(iterable)Parameters
- iterableIterable
- The items to add.
Return value
Nothing (None); the list is changed in place.
Examples
Adding items from another list
Python 3.13
a = [1, 2]
a.extend([3, 4])
print(a)[1, 2, 3, 4]
A string is added character by character
Python 3.13
a = [1]
a.extend('ab')
print(a)[1, 'a', 'b']
Details
Any iterable is unpacked into items: a string into characters, a dictionary into keys. a += [3, 4] works the same way as a.extend([3, 4]).