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Difference between append and extend methods in Python

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schedule Jul 1, 2022
Last updated
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The below table summarizes the difference between the list.append(~) and list.extend(~) methods:

Method

Description

append

Appends input object at the end of the list.

extend

Adds elements to a list by appending each element from the provided iterable.

Append method

To add the list ['d', 'e'] to the end of list x:

x = ['a', 'b', 'c']
x.append(['d', 'e'])
print (x)
['a', 'b', 'c', ['d', 'e']]

Note that the list ['d', 'e'] is added as a single element to list x.

Extend method

To add the elements of list ['d', 'e'] to the end of list x:

x = ['a', 'b', 'c']
x.extend(['d', 'e'])
print (x)
['a', 'b', 'c', 'd', 'e']

Note that the individual elements of list ['d', 'e'] are each added to list x.

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Published by Isshin Inada
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