更改列表中的值-python [英] change values in a list - python

问题描述

我有此代码:

a=[['a','b','c'],['a','f','c'],['a','c','d']]    
for x in a:    
    for y in x:    
        if 'a' in x:    
            x.replace('a','*')`  

但结果是:

a=[['a','b','c'],['a','f','c'],['a','c','d']]

和漫游器a=[['b','c'],['f','c'],['c','d']]

我应该怎么做才能使更改持续?

What should I do so the changes will last?

推荐答案

如果要从所有嵌套子列表中删除所有出现的'a'，则可以执行以下操作:

If you want to remove all occurrences of 'a' from all nested sublists, you could do:

>>> [[i for i in x if i != 'a'] for x in a]
[['b', 'c'], ['f', 'c'], ['c', 'd']]

如果要用星号替换它们:

if you want to replace them with asterisk:

>>> [[i if i != 'a' else '*' for i in x] for x in a]
[['*', 'b', 'c'], ['*', 'f', 'c'], ['*', 'c', 'd']]

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