[转]Python实现字符串反转的几种方法

#第一种：使用字符串切片
result = s[::-1]
#第二种：使用列表的reverse方法
l = list(s)
l.reverse()
result = "".join(l)
#当然下面也行
l = list(s)
result = "".join(l[::-1])
#第三种：使用reduce
result = reduce(lambda x,y:y+x,s)
#第四种：使用递归函数
def func(s):
    if len(s) <1:
        return s
    return func(s[1:])+s[0]
result = func(s)
#第五种：使用栈
def func(s):
    l = list(s) #模拟全部入栈
    result = ""
    while len(l)>0:
        result += l.pop() #模拟出栈
    return result
result = func(s)
#第六种：for循环
def func(s):
    result = ""
    max_index = len(s)-1
    for index,value in enumerate(s):
        result += s[max_index-index]
    return result
result = func(s)
#第七种：while循环
def func(s):
    ret = ‘‘
    len_ = len(s) -1
    while len_ >= 0 :
        ret += s[len_]
        len_ = len_ -1
	#print (ret)
    return ret