为什么输出结果是else后面的，s1.isdisjoint(s2)=='False'，if语句为啥不成立
s1 = set([1, 2, 3, 4, 5])
s2 = set([1, 2, 3, 4, 5, 6, 7, 8, 9])
s3=set()
s4=set()
print(s1.isdisjoint(s2))
a='False'
if s1.isdisjoint(s2)==a:
s3=s2-s1
L=list(s3)
T=tuple(s3)
print(L,T)
else:
print(s4)
