person.py

from address import Address

class Person:
    def __init__(self, first,last,dob,phone, address):
        self.first_name = first
        self.last_name = last
        self.date_of_birth = dob
        self.phone = phone
        self.addresses = []

        if isinstance(address,Address):
            self.addresses.append(address)
        elif isinstance(address,list):
            for entry in address:
                if not isinstance(entry, Address):
                    raise Error("Invalid Address ...")
            self.addresses = address
        else:
            raise Error("Invalid Address ...")

    def add_address(self,address):
        if not isinstance(address, Address):
            raise Error("Invalid Address ...")
        self.addresses.append(address)