def __len__(self):
        return len(list(self.iterkeys()))
Strips any international prefix (such as +, 00, 011) present in the
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/MH.__len__--crossover with--dataset/ETHPy150Open daviddrysdale/python-phonenumbers/python/phonenumbers/phonenumberutil.py/_maybe_strip_i18n_prefix_and_normalize