builder_facets.py

class Person:
    def __init__(self):
        # address
        self.street_address = None
        self.postcode = None
        self.city = None

        # employment
        self.company_name = None
        self.position = None
        self.annual_income = None

    def __str__(self):
        return f'Add: {self.street_address}, {self.postcode}, {self.city}' +\
               f'\nEmployed at {self.company_name} as a {self.position} earning \
               {self.annual_income}'


class PersonBuilder:
    def __init__(self, person=Person()):
        self.person = person

    @property
    def works(self):
        return PersonJobBuilder(self.person)

    @property
    def lives(self):
        return PersonAddressBuilder(self.person)

    def build(self):
        return self.person


class PersonJobBuilder(PersonBuilder):
    def __init__(self, person):
        super().__init__(person)

    def at(self, company_name):
        self.person.company_name = company_name
        return self

    def as_a(self, position):
        self.person.position = position
        return self

    def earning(self, annual_income):
        self.person.annual_income = annual_income
        return self


class PersonAddressBuilder(PersonBuilder):
    def __init__(self, person):
        super().__init__(person)

    def at(self, street_address):
        self.person.street_address = street_address
        return self

    def at_postcode(self, postcode):
        self.person.postcode = postcode
        return self

    def in_city(self, city):
        self.person.city = city
        return self

PB = PersonBuilder()
PERSON1 = PB\
    .lives\
    .at('123 London Road')\
    .in_city('London')\
    .at_postcode('SW12BC')\
    .works\
    .at('Fabrikam')\
    .as_a('Engineer')\
    .earning(123000)\
    .build()
print(PERSON1)