Может быть, это то, что вам нужно:
import itertools
my_array = ['A','B','C']
combos = []
for i in range(1,len(my_array)):
combos += itertools.combinations(my_array, i)
result = []
for c1 in combos:
curr = list(c1)
for c2 in combos:
if not any(i in curr for i in c2):
result.append([curr, list(c2)])
result
#[[['A'], ['B']],
# [['A'], ['C']],
# [['A'], ['B', 'C']],
# [['B'], ['A']],
# [['B'], ['C']],
# [['B'], ['A', 'C']],
# [['C'], ['A']],
# [['C'], ['B']],
# [['C'], ['A', 'B']],
# [['A', 'B'], ['C']],
# [['A', 'C'], ['B']],
# [['B', 'C'], ['A']]]