return s == s[::-1]
def two(lst):
lst.sort()
del(lst[len(lst) - 1])
lst.append(lst.pop(0))
return lst.copy()
def three(s1, s2, s3):
return (s1 | s2 | s3,
s1 &s2 &s3,
(s1 | s2) - (s2 | s3))
def four(num):
return sum(map(int, str(num)))
def five():
text="12345"
fo = open("five.txt", "w", encoding="utf-8")
fo.write(text)
fo.close()
a=(0,0,0,0)for i in range(4):
for j in range(1,4):
b = list(a)
b[i]=j
print(tuple(b))
元祖中的元素不可被修改，可以先将元祖转为list变更后再转回来
