Utilisation et exemples de la méthode pop() de la liste Python

Python list methods

La méthode pop() supprime l'élément à l'index donné dans la liste et renvoie l'élément supprimé.

La syntaxe de la méthode pop() est :

list.pop(index)

Paramètre de pop()

• La méthode pop() utilise un seul paramètre (index).

• Les paramètres passés à la méthode sont optionnels. Si aucun n'est passé, l'index par défaut est utilisé.-1as the parameter (the index of the last item) to be passed.

• If the index passed to this method is not within the range, it will throwIndexError: pop index out of rangeException.

pop() return value

The pop() method returns the item existing at the given index. And it deletes the item from the list.

Example1: Take the item at the given index from the list

# Programming language list
languages = ['Python', 'Java', 'C'++', 'French', 'C'
# Delete and return the fourth item
return_value = languages.pop()3)
print('Return value:', return_value)
# Updated list after being updated
print('Updated list:', languages)

Output result

Return value: French
Updated list: ['Python', 'Java', 'C'++', 'C'

Note: Python's index starts from 0, not1.

If you need to pop the item at4 ^numberelements, you need to set3is passed to the pop() method.

Example2：pop() without index, and negative index

# Programming language list
languages = ['Python', 'Java', 'C'++', 'Ruby', 'C'
# Delete and return the last item
print('When no index is passed:')　
print('Return value:', languages.pop())
print('Updated list:', languages)
# Delete and return the last item
print('\nParameter is-1:')　
print('Return value:', languages.pop())-1))
print('Updated list:', languages)
# Delete and return the third last item
print('\nParameter is-3:')　
print('Return value:', languages.pop())-3))
print('Updated list:', languages)

Output result

When no index is passed:
Return value: C
Updated list: ['Python', 'Java', 'C'++', 'Ruby'
The parameter is-1:
Return value: Ruby
Updated list: ['Python', 'Java', 'C'++]
The parameter is-3:
Return value: Python
Updated list: ['Java', 'C'++]

If you need to remove the given item from the list, you can useremove() method.

And, you can use the del statementRemove items or slices from the list.

Python list methods