def keys(self):
        return list(self.iterkeys())
Tests whether a phone number matches a valid pattern.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/Mailbox.keys--crossover with--dataset/ETHPy150Open daviddrysdale/python-phonenumbers/python/phonenumbers/phonenumberutil.py/is_valid_number