python3反转字符串的3种方法(小结)

#切片法
def reverse1():
  s=input("请输入需要反转的内容：")
  return s[::-1]
reverse1()

#运行结果
In [23]: def reverse1():
  ...: s=input("请输入需要反转的内容：")
  ...: return s[::-1]
  ...: 
  ...: reverse1()

请输入需要反转的内容：你是一个小南瓜
Out[23]: '瓜南小个一是你'

#递归反转
def reverse2(s):
  if s=="":
    return s
  else:
    return reverse2(s[1:])+s[0]
reverse2("sidfmawsmdisd是当面问")

#运行结果
In [24]: def reverse2(s):
  ...: if s=="":
  ...: return s
  ...: else:
  ...: return reverse2(s[1:])+s[0]
  ...: 
  ...: reverse2("sidfmawsmdisd是当面问")
Out[24]: '问面当是dsidmswamfdis'

In [25]: l=['a', 'b', 'c', 'd']
  ...: l.reverse()
  ...: print (l)
['d', 'c', 'b', 'a']

#借用列表，使用reverse()方法
def reverse3(s):
  l=list(s)
  l.reverse()
  print("".join(l))
reverse3("soifmi34pomOsprey，，是")

#运行结果
In [26]: def reverse3(s):
  ...: l=list(s)
  ...: l.reverse()
  ...: print("".join(l))
  ...: 
  ...: reverse3("soifmi34pomOsprey，，是")
  ...: