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f=lambda s:s and{r[0]+t for r in{s,s.swapcase()}for t in f(s[1:])}or{s}
 
for s in 'a1a', 'abc', 'Hi!', 'ž1a':
	print(f(s))

Success #stdin #stdout 0.02s 9984KB

stdin

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Standard input is empty

stdout

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{'A1A', 'a1A', 'A1a', 'a1a'}
{'ABC', 'abC', 'AbC', 'Abc', 'abc', 'aBc', 'aBC', 'ABc'}
{'Hi!', 'HI!', 'hI!', 'hi!'}
{'Ž1a', 'Ž1A', 'ž1A', 'ž1a'}

https://ideone.com/buAQWf

language:

Python 3 (python 3.9.5)

created:

visibility:

public

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