A helper function to set the values related to leading zeros in a
    PhoneNumber.

def _set_italian_leading_zeros_for_phone_number(national_number, numobj):
    """A helper function to set the values related to leading zeros in a
    PhoneNumber."""
    if len(national_number) > 1 and national_number[0] == U_ZERO:
        numobj.italian_leading_zero = True
        number_of_leading_zeros = 1
        # Note that if the number is all "0"s, the last "0" is not counted as
        # a leading zero.
        while (number_of_leading_zeros < len(national_number) - 1 and
               national_number[number_of_leading_zeros] == U_ZERO):
            number_of_leading_zeros += 1
        if number_of_leading_zeros != 1:
            numobj.number_of_leading_zeros = number_of_leading_zeros