重合的值不是12345嘛，应该是这样的呀，求童鞋指点
s1 = set([1, 2, 3, 4, 5])
s2 = set([1, 2, 3, 4, 5, 6, 7, 8, 9])
flag = s1.isdisjoint(s2)
if not flag:
for item in s2:
if item in s1:
print(item)
# 递归
def my_sumB(n):
sum = 0
if n == 1:
sum = n
else:
sum = n + my_sumB(n - 1)
return sum
#循环
def your_sumB(n):
s=0
for i in range(1,n+1):
s+=i
return s
