交换字符串输入参数中字母的大小写 [英] Swap case of letters in string input parameter

问题描述

我想用 Python 编写一个函数，该函数接受一个包含大小写字母的字符串作为参数，并将大写字母转换为小写，将小写字母转换为大写.

例如:

<预><代码>>>>func('DDDDDDDD')'dddDDDDD'

我想用字符串来做，但我不知道怎么做.

解决方案

EDIT - 比我原来的答案更简单，并且支持 ASCII 和 unicode.感谢评论者.

a = 'aBcD'a.swapcase()>>A B C D

原始答案 - 无视

a = 'aBcD'''.join(map(str.swapcase, a))>>A B C D

这会将 str.swapcase() 函数映射到字符串 a 的每个元素，交换每个字符的大小写并返回一个字符列表.>

''.join() 将列表中的每个字符连接成一个新字符串.

I would like to write a function in Python that takes a string which has lower and upper case letters as a parameter and converts upper case letters to lower case, and lower case letters to upper case.

For example:

>>> func('DDDddddd')
'dddDDDDD'

I want to do it with strings but I couldn't figure out how.

解决方案

EDIT - Way simpler than my original answer, and supports both ASCII and unicode. Thanks commenters.

a = 'aBcD'
a.swapcase()
>> AbCd

Original answer - disregard

a = 'aBcD'
''.join(map(str.swapcase, a))
>> AbCd

This will map the str.swapcase() function to each element of the string a, swapping the case of each character and returning an list of characters.

''.join() will join each character in the list into a new string.

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