将带有字符串的列表全部转换为小写或大写 [英] Convert a 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.有没有一种函数可以一次将所有字符串转换为小写，反之亦然，大写?

解决方案

可以通过 列表推导

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

或使用 map 函数

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

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

解决方案

It can be done with list comprehensions

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

or with the map function

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

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