Python 从列表中删除项目 [英] Python removing items from list

问题描述

我有一个给定格式的列表:

I have a list in the given format:

[['John', 'Smith'], ['Linus', 'Torvalds'], ['Bart', 'Simpson']]

列表 ['Linus Torvalds', ''] 中有一些类似的元素，我想删除它们.那么为什么下面的代码没有删除它们呢?

There are some elements like this in the list ['Linus Torvalds', ''] and I want to remove those. So why doesn't the following code remove them?

for i in people:
    if(i[0] == '' or i[1] == ''):
        print people.pop(people.index(i))

推荐答案

您在迭代列表时正在更改列表，这就是问题的根源.一种有效的方法是

You are changing the list while iterating over it and this is the source of your problems. An approach that works is

people[:] = [p for p in people if p[0] != '' and p[1] != '']

这样就构建了一个仅包含您想要的元素的新临时列表，然后在操作完成时将其分配给原始列表对象.

this way a new temporary list containing only the elements you want is built and then assigned to the original list object when the operation is complete.

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