sample python design pattern

main.py

In [5]: from abc import ABC, abstractmethod
   ...: class Base(ABC):
   ...:     @abstractmethod
   ...:     def get_by_id(self, id):
   ...:         pass
   ...: class C1(Base):
   ...:     def get_by_id(self, id):
   ...:         return f"hello client1: {id}"
   ...: class C2(Base):
   ...:     def get_by_id(self, id):
   ...:         return f"hello client2: {id}"
   ...: registers = [C1(), C2()]
   ...: for r in registers:
   ...:     print(r.get_by_id(10))
   ...:
hello client1: 10
hello client2: 10

main1.py

In [5]: from abc import ABC, abstractmethod
   ...: class Base(ABC):
   ...:     @abstractmethod
   ...:     def get_by_id(self, id):
   ...:         pass
   ...:     @abstractmethod
   ...:     def create(self, value):
   ...:         pass
   ...: class C1(Base):
   ...:     def get_by_id(self, id):
   ...:         return f"hello client1: {id}"
   ...:     def create(self, value):
   ...:         return f"created row client1: value {id}"
   ...: class C2(Base):
   ...:     def get_by_id(self, id):
   ...:         return f"hello client2: {id}"
   ...:     def create(self, value):
   ...:         return ""
   ...: registers = [
   ...:     # client, built-in
   ...:     (C1(), ["update", "delete", "create"]),
   ...:     (C2(), []),
   ...: ]
   ...: for r, builtin in registers:
   ...:     print(r.get_by_id(10), builtin)
   ...:     if "create" in builtin:
   ...:         print(r.create("hello"))
   ...: