将所有字符串都转换为小写或大写的Python列表 [英] Convert a Python list with strings all to lowercase or uppercase

问题描述

我有一个包含字符串的python列表变量.是否有一个python函数可以将所有字符串一次转换为小写，反之亦然，将大写转换为小写?

I have a python list variable that contains strings. Is there a python function that can convert all the strings in one pass to lowercase and vice versa, uppercase?

推荐答案

可以使用列表推导来完成.这些基本上采用[function-of-item for item in some-list]的形式.例如，要创建一个新列表，其中所有项目均为小写(或在第二个片段中为大写)，请使用:

It can be done with list comprehensions. These basically take the form of [function-of-item for item in some-list]. For example, to create a new list where all the items are lower-cased (or upper-cased in the second snippet), you would use:

>>> [x.lower() for x in ["A","B","C"]]
['a', 'b', 'c']

>>> [x.upper() for x in ["a","b","c"]]
['A', 'B', 'C']

您还可以使用map功能:

>>> map(lambda x:x.lower(),["A","B","C"])
['a', 'b', 'c']
>>> map(lambda x:x.upper(),["a","b","c"])
['A', 'B', 'C']

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