Missing Implementor and Abstraction in Bridge Pattern

Question

Missing Implementor and Abstraction in Bridge Pattern

sheiun opened this issue 5 years ago · comments

The code https://github.com/faif/python-patterns/blob/master/patterns/structural/bridge.py
different from the source https://en.wikibooks.org/wiki/Computer_Science_Design_Patterns/Bridge#Python

The Bridge Pattern's UML

Grygorii Iermolenko · Answer 1 · Wed Apr 24 2019 17:26:50 GMT+0800 (China Standard Time)

hi @sheiun , thanks for the issue.

In terms of the pattern: Abstraction/interface delegates the work to the implementation/platform.
It is not about interfaces or abstract classes in any particular programming language.
As I see it - it is not always necessary to create python ABC classes to emulate something like interface from other languages.

TLDR: don't see a problem here.

Thoughts?

Sakis Kasampalis · Answer 2 · Thu Apr 25 2019 01:54:08 GMT+0800 (China Standard Time)

One of the benefits of duck typing is that it doesn't force you to define interfaces for everything. You can still do it if you want with a module like abc as mentioned by @gyermolenko, but it's not mandatory. I also find the current implementation fine.