Dp Abstract Factory

In this tutorial, you'll learn about How to Fix Abstract Factory Errors. We cover key concepts, practical examples, and best practices.

Fix abstract factory errors when factory families don't align or product interfaces mismatch.

Quick Fix

Wrong

class WinFactory:
    def create_btn(self): return WinButton()
class MacFactory:
    def create_btn(self): return MacButton()
def get_factory(os):
    if os=='win': return WinFactory()
    return MacFactory()

Each factory returns different button types but no common interface. Client must know concrete types.

Right

class Button:
    def render(self): pass
class WinButton(Button):
    def render(self): print('Win')
class MacButton(Button):
    def render(self): print('Mac')
class GUIFactory:
    def create_button(self) -> Button: pass
class WinFactory(GUIFactory):
    def create_button(self): return WinButton()
class MacFactory(GUIFactory):
    def create_button(self): return MacButton()
def get_factory(os):
    factories={'win':WinFactory,'mac':MacFactory}
    return factories[os]()

f=get_factory('win'); btn=f.create_button(); btn.render() -> 'Win'. Client works with abstract Button.

Prevention

Abstract factory returns family of related products sharing common interfaces. Client depends on abstractions.

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