wordcube.py

letters = 'REQUESTS'

len_ = len(letters)
range_ = range(len_)
array = [[[letters[(x+y+z) % len_] for x in range_] for y in range_] for z in range_]

wordcube = [[''.join(word) for word in layer] for layer in array]
wordcube = ['\n'.join(layer) for layer in wordcube]
wordcube = '\n\n'.join(wordcube)

print(wordcube)