[Tutor] Using for loops for combinations

[Chinanu 'Chinex' Onyekachi]

Find all possible combinations of a specific word (string) using any combination of upper case and lower case letters with a for loop (no itertools). 



An example:

string_input = hat

comboination = ['hat', 'Hat', 'HAt', 'HAT', 'hAT', 'haT', 'HaT', 'hAt']



What I've tried so far, I’m trying to do this using knowledge from loops, if and else, strings and lists.
    gear = ['hat']

for i in range(len(gear[0])):
    gearlist1 = list(gear[0])
    gearlist2 = [c.upper() for c in gearlist1]
    gearlist3 = [gearlist1[0].join(gearlist2)]


print 'list is: %r' % (gearlist3 ,),
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