code: def merge_from(self, other):
          
          if other.country_code is not None:
              self.country_code = other.country_code
          if other.national_number is not None:
              self.national_number = other.national_number
          if other.extension is not None:
              self.extension = other.extension
          if other.italian_leading_zero is not None:
              self.italian_leading_zero = other.italian_leading_zero
          if other.number_of_leading_zeros is not None:
              self.number_of_leading_zeros = other.number_of_leading_zeros
          if other.raw_input is not None:
              self.raw_input = other.raw_input
          if other.country_code_source is not CountryCodeSource.UNSPECIFIED:
              self.country_code_source = other.country_code_source
          if other.preferred_domestic_carrier_code is not None:
              self.preferred_domestic_carrier_code = other.preferred_domestic_carrier_code
docs: Merge information from another PhoneNumber object into this one.