Generation all combinations of lower and upper characters in a word

Код ниже сначала вызывает zip(text.upper(), text.lower()) и затем применяет itertools.product к *zip(text.upper(), text.lower()). 

(.env) boris@boris-All-Series:~/VOTING$ cat allCombinatios.py

from itertools import product

text = 'Yandex'

# convert to list

result = list(map(''.join, product(*zip(text.upper(), text.lower()))))

print(result)

print(len(result))

print('\n')

# convert to tuple

result1 = tuple(map(''.join, product(*zip(text.upper(), text.lower()))))

print(result1)

print(len(result1))

(.env) boris@boris-All-Series:~/VOTING$ python3 allCombinatios.py

['YANDEX', 'YANDEx', 'YANDeX', 'YANDex', 'YANdEX', 'YANdEx', 'YANdeX', 'YANdex', 'YAnDEX', 'YAnDEx', 'YAnDeX', 'YAnDex', 'YAndEX', 'YAndEx', 'YAndeX', 'YAndex', 'YaNDEX', 'YaNDEx', 'YaNDeX', 'YaNDex', 'YaNdEX', 'YaNdEx', 'YaNdeX', 'YaNdex', 'YanDEX', 'YanDEx', 'YanDeX', 'YanDex', 'YandEX', 'YandEx', 'YandeX', 'Yandex', 'yANDEX', 'yANDEx', 'yANDeX', 'yANDex', 'yANdEX', 'yANdEx', 'yANdeX', 'yANdex', 'yAnDEX', 'yAnDEx', 'yAnDeX', 'yAnDex', 'yAndEX', 'yAndEx', 'yAndeX', 'yAndex', 'yaNDEX', 'yaNDEx', 'yaNDeX', 'yaNDex', 'yaNdEX', 'yaNdEx', 'yaNdeX', 'yaNdex', 'yanDEX', 'yanDEx', 'yanDeX', 'yanDex', 'yandEX', 'yandEx', 'yandeX', 'yandex']

64 = 2^6  в слове Yandex шесть букв и для каждой два регистра.

('YANDEX', 'YANDEx', 'YANDeX', 'YANDex', 'YANdEX', 'YANdEx', 'YANdeX', 'YANdex', 'YAnDEX', 'YAnDEx', 'YAnDeX', 'YAnDex', 'YAndEX', 'YAndEx', 'YAndeX', 'YAndex', 'YaNDEX', 'YaNDEx', 'YaNDeX', 'YaNDex', 'YaNdEX', 'YaNdEx', 'YaNdeX', 'YaNdex', 'YanDEX', 'YanDEx', 'YanDeX', 'YanDex', 'YandEX', 'YandEx', 'YandeX', 'Yandex', 'yANDEX', 'yANDEx', 'yANDeX', 'yANDex', 'yANdEX', 'yANdEx', 'yANdeX', 'yANdex', 'yAnDEX', 'yAnDEx', 'yAnDeX', 'yAnDex', 'yAndEX', 'yAndEx', 'yAndeX', 'yAndex', 'yaNDEX', 'yaNDEx', 'yaNDeX', 'yaNDex', 'yaNdEX', 'yaNdEx', 'yaNdeX', 'yaNdex', 'yanDEX', 'yanDEx', 'yanDeX', 'yanDex', 'yandEX', 'yandEx', 'yandeX', 'yandex')

64