>>> import itertools>>> map(''.join, itertools.product(*((c.upper(), c.lower()) for c in 'Fox')))['FOX', 'FOx', 'FoX', 'Fox', 'fOX', 'fOx', 'foX', 'fox']要么
>>> s = 'Fox'>>> map(''.join, itertools.product(*zip(s.upper(), s.lower())))
>>> import itertools>>> map(''.join, itertools.product(*((c.upper(), c.lower()) for c in 'Fox')))['FOX', 'FOx', 'FoX', 'Fox', 'fOX', 'fOx', 'foX', 'fox']要么
>>> s = 'Fox'>>> map(''.join, itertools.product(*zip(s.upper(), s.lower())))