具体代码如下所示：
#字符串反转
def reverse (s):
rt = ''
for i in range(len(s)-1,-1,-1):
rt += s[i]
return rt
def reverse2 (s):
li = list(s)
li.reverse()
rt = "".join(li) return rt
def reverse3 (s):
return s[::-1]
def reverse4 (s):
return "".join(reversed(s))
from functools import reduce
def
