python - 有没有办法(永远)检查某个字符串的长度是否可以被某个数字整除？

Question

在我试图在这里编写的代码中，我需要它不断检查字符串的长度是否可以被3整除，如果是，则输出有效的输出，如果不是，则再次循环。我事先在代码中定义了所有其他变量，例如a，u()。

def u():
  if int(len(str(a))) ('is divisible by 3'):
    print('The sum of all characters in that string is divisible by 3')
  while int(len(str(a)))  ('is not divisible by 3'):
    print('The sum of all characters in that string is NOT divisible by 3, try again!')
    u()
u()

如果有一个简短而有效的答案，我们将不胜感激，谢谢!

Answer 1

在这里，我使用了从用户那里获取输入并检查是否满足条件。

def u():

  a = input(' Input string ')
  if int(len(str(a)))%3 ==0:   #('is divisible by 3'):
      print('The sum of all characters in that string is divisible by 3')
  else: # int(len(str(a)))  ('is not divisible by 3'):
      print('The sum of all characters in that string is NOT divisible by 3, try again!')
      u()
u()