def merge_from(self, other):
        """Merge information from another PhoneNumber object into this one."""
        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
Merge information from another PhoneNumber object into this one.