builder_concept.py

# pylint: disable=too-few-public-methods
# pylint: disable=arguments-differ
"Builder Concept Sample Code"
from abc import ABCMeta, abstractmethod


class IBuilder(metaclass=ABCMeta):
    "The Builder Interface"

    @staticmethod
    @abstractmethod
    def build_part_a():
        "Build part a"

    @staticmethod
    @abstractmethod
    def build_part_b():
        "Build part b"

    @staticmethod
    @abstractmethod
    def build_part_c():
        "Build part c"

    @staticmethod
    @abstractmethod
    def get_result():
        "Return the final product"


class Builder(IBuilder):
    "The Concrete Builder."

    def __init__(self):
        self.product = Product()

    def build_part_a(self):
        self.product.parts.append('a')
        return self

    def build_part_b(self):
        self.product.parts.append('b')
        return self

    def build_part_c(self):
        self.product.parts.append('c')
        return self

    def get_result(self):
        return self.product


class Product():
    "The Product"

    def __init__(self):
        self.parts = []


class Director:
    "The Director, building a complex representation."

    @staticmethod
    def construct():
        "Constructs and returns the final product"
        return Builder()\
            .build_part_a()\
            .build_part_b()\
            .build_part_c()\
            .get_result()


# The Client
PRODUCT = Director.construct()
print(PRODUCT.parts)