def _is_viable_phone_number(number):
 if (len(number) < _MIN_LENGTH_FOR_NSN):
  return False
 match = fullmatch(_VALID_PHONE_NUMBER_PATTERN, number)
 return bool(match)

def _is_viable_phone_number ( number ) : if ( len ( number ) < _MIN_LENGTH_FOR_NSN ) : return False match = fullmatch ( _VALID_PHONE_NUMBER_PATTERN , number ) return bool ( match )
checks to see if a string could possibly be a phone number .