Python实现字符串反转的几种方法

1 result = s[::-1]

1 l = list(s)
2 l.reverse()
3 result = "".join(l)
4 或者：
5 l = list(s)
6 result = "".join(l[::-1])

1 result = reduce(lambda x,y:y+x,s)

1 def func(s):
2     if len(s) <1:
3         return s
4     return func(s[1:])+s[0]
5 result = func(s)

1 def func(s):
2     l = list(s) #模拟全部入栈
3     result = ""
4     while len(l)>0:
5         result += l.pop() #模拟出栈
6     return result
7 result = func(s)

1 def func(s):
2     result = ""
3     max_index = len(s)-1
4     for index,value in enumerate(s):
5         result += s[max_index-index]
6     return result
7 result = func(s)