all Python 3Lists (list)function

list.append

adding

Append a single item to the end of the list in place; returns None.

Syntax

lst.append(item)

It mutates the list in place and returns None, so lst = lst.append(x) is the classic way to lose your list. The argument is stored as one single element even when it is itself a list or a string — use extend to spread the contents out. Appending costs amortised O(1).

Examples

lst = [1, 2]
lst.append(3)
print(lst)          # → [1, 2, 3]
lst.append([4, 5])
print(lst)          # → [1, 2, 3, [4, 5]]

See also

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