'Erase the contents of the object'

def clear(self):

    self.country_code = None
    self.national_number = None
    self.extension = None
    self.italian_leading_zero = None
    self.number_of_leading_zeros = None
    self.raw_input = None
    self.country_code_source = None
    self.preferred_domestic_carrier_code = None
