python中字符串翻转的方法

#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 reverse5 (s):
    return reduce(lambda x,y:y+x,s)

前两种是传统方法，后两种比较新颖