docs: def validate_password_strength(value):
      """Validates that a password is as least 7 characters long and has at least
      1 digit and 1 letter.
      """
      min_length = 7
  
      if len(value) < min_length:
          raise ValidationError(_('Password must be at least {0} characters '
                                  'long.').format(min_length))
  
      # check for digit
      if not any(char.isdigit() for char in value):
          raise ValidationError(_('Password must contain at least 1 digit.'))
  
      # check for letter
      if not any(char.isalpha() for char in value):
          raise ValidationError(_('Password must contain at least 1 letter.'))