Python列表删除的三种方法代码分享

时间:2022-09-15 15:04:07

1、使用del语句删除元素

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>>> i1 = ["a",'b','c','d']
 
>>> del i1[0]
>>> print(i1)
['b', 'c', 'd']
>>>

del语句将值从列表中删除后,就再也无法访问它了。

2、使用pop()删除元素

  pop()可删除列表末尾的元素,并让你能够接着使用它。食欲弹出(pop)源自这样的类比:列表就是一个栈,而删除列表末尾的元素相当于弹出栈顶元素。

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>>> i1 = ['cai','rui','headsome']
>>> i2 = i1.pop()
>>> print(i1)
['cai', 'rui']
>>> print(i2)
headsome
>>>

 作用:假设列表中的摩托车是按照购买时间存储的,就可以使用方法pop()打印一条消息,指出最后购买的是哪款摩托车:

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#!/usr/bin/env python
motorcycles = ['honda','yamaha','suzuki']
last_owned = motorcycles.pop()
print("The last motorcycle i owned was a " + last_owned.title() + '.')
================================
The last motorcycle i owned was a Suzuki.

弹出列表中任何位置处的元素:

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#!/usr/bin/env python
motorcycles = ['honda','yamaha','suzuki']
last_owned = motorcycles.pop(0)
print("The last motorcycle i owned was a " + last_owned.title() + '.')
========================================
The last motorcycle i owned was a Honda.

3、remove 根据值删除元素

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motorcycles = ['honda','yamaha','suzuki']
motorcycles.remove('yamaha')
print(motorcycles)
====================================
['honda', 'suzuki']

注意:remove()只删除一个指定的值。如果要删除的值可能在列表中出现多次,就需要使用循环来判断是否删除了所有的值。

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原文链接:http://www.cnblogs.com/caicairui/p/7550868.html