在 Python 中遍历列表时删除元素

2022-01-10 00:00:00 python list loops python-datamodel iterator

问题描述

在 Java 中，我可以使用 Iterator 然后使用 .remove() 迭代器的方法来移除迭代器返回的最后一个元素，像这样:

In Java I can do by using an Iterator and then using the .remove() method of the iterator to remove the last element returned by the iterator, like this:

import java.util.*;

public class ConcurrentMod {
    public static void main(String[] args) {
        List<String> colors = new ArrayList<String>(Arrays.asList("red", "green", "blue", "purple"));
        for (Iterator<String> it = colors.iterator(); it.hasNext(); ) {
            String color = it.next();
            System.out.println(color);
            if (color.equals("green"))
                it.remove();
        }
        System.out.println("At the end, colors = " + colors);
    }
}

/* Outputs:
red
green
blue
purple
At the end, colors = [red, blue, purple]
*/

我将如何在 Python 中执行此操作?在 for 循环中迭代列表时，我无法修改列表，因为它会导致内容被跳过(请参阅 这里).而且似乎没有与 Java 的 Iterator 接口等效的东西.

How would I do this in Python? I can't modify the list while I iterate over it in a for loop because it causes stuff to be skipped (see here). And there doesn't seem to be an equivalent of the Iterator interface of Java.

解决方案

遍历列表的副本:

for c in colors[:]:
    if c == 'green':
        colors.remove(c)

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