text: # -*- coding: utf-8 -*-
  
  def count_digits(text: str) -> int:
      digit = 0
      for i in list(text):
          if i.isdigit():
              digit += 1
      return digit
  
      # another pattern
      return len([i for i in text if i.isdigit()])
  
  
  if __name__ == '__main__':
      print("Example:")
      print(count_digits('hi'))
  
      # These "asserts" are used for self-checking and not for an auto-testing
      assert count_digits('hi') == 0
      assert count_digits('who is 1st here') == 1
      assert count_digits('my numbers is 2') == 1
      assert count_digits('This picture is an oil on canvas '
          'painting by Danish artist Anna '
          'Petersen between 1845 and 1910 year') == 8
      assert count_digits('5 plus 6 is') == 2
      assert count_digits('') == 0
      print("Coding complete? Click 'Check' to earn cool rewards!")
  