在Python中查找所有可能的大小写排列 [英] Finding all possible case permutations in Python

问题描述

我需要计算python中仅大小写的所有可能排列的列表 例如，使用ar的输入，它将返回 ['ar'，'Ar'，'aR'，'AR']
或弧 ['arc'，'Arc'，'ARc'，'aRc'，'aRC'，'ARC']，我知道可能有一些不错的方法，但对于我的一生，我无法弄清楚.

I need to work out a list of all possible permutations of case only in python for example with input of ar it would return [ 'ar','Ar','aR','AR']
or arc [ 'arc','Arc','ARc','aRc','aRC','ARC'] and I know there is likely some Nice method but for the life of me I can not figure it out.

推荐答案

def all_casings(input_string):
    if not input_string:
        yield ""
    else:
        first = input_string[:1]
        if first.lower() == first.upper():
            for sub_casing in all_casings(input_string[1:]):
                yield first + sub_casing
        else:
            for sub_casing in all_casings(input_string[1:]):
                yield first.lower() + sub_casing
                yield first.upper() + sub_casing

---

>>> [x for x in all_casings("foo")]
['foo', 'Foo', 'fOo', 'FOo', 'foO', 'FoO', 'fOO', 'FOO']
>>> list(all_casings("foo"))
['foo', 'Foo', 'fOo', 'FOo', 'foO', 'FoO', 'fOO', 'FOO']

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