如何用Python拒绝离散数学的问题？

def powerset(s):
。。if len(s) == 0:
。。。。 return [set()]
。。else:
。。。。element = s.pop()
。。。。powerset_without_element = powerset(s)
。。。。powerset_with_element = [ subset | {element} for subset in powerset_without_element]
。。。。return powerset_without_element + powerset_with_element
powerset_of_1_2 = powerset({1, 2})
print(powerset_of_1_2)