def reverse_string(my_string):
   if len(my_string) == 0:
      return my_string
   else:
      return reverse_string(my_string[1:]) + my_string[0]
my_str = str(input("Enter the string that needs to be reversed : "))
print("The string is :")
print(my_str)
print("The reversed string is :")
print(reverse_string(my_str))

输入需要反转的字符串：Williw
这个字符串是：
Williw
反转后的字符串是：
williW