code: def keywords_special_characters(keywords):
      
      invalid_chars = '!\"#$%&\'()*+-./:;<=>?@[\\]^_{|}~\t\n'
      if any(char in invalid_chars for char in keywords):
          raise ValidationError(MESSAGE_KEYWORD_SPECIAL_CHARS)
docs: Confirms that the keywords don't contain special characters
  
      Args:
          keywords (str)
  
      Raises:
          django.forms.ValidationError