I am trying to create a module that wraps all classes, and use them somewhere else.
class Mixins:
class B:
pass
class C:
pass
b = Mixins.B()
print(Mixins.__all_subclasses__())
# [Mixins.B, Mixins.C]
I mean, I can stack all subclasses in a list after I created one, but not elegant. is there an instinctive built-in for me to do this? python 3.7.
You can check inspect module
import inspect
class Mixins:
class B:
pass
class C:
pass
print(inspect.getmembers(Mixins, lambda x: inspect.isclass(x)))
# [('B', <class '__main__.Mixins.B'>), ('C', <class '__main__.Mixins.C'>), ('__class__', <class 'type'>)]
You can do this by subclassing the Mixin class directly and then accessing the __subclasses__ method on the Mixin class
class Mixin:
pass
class B(Mixin):
pass
class C(Mixin):
pass
print(Mixin.__subclasses__())
which prints
[<class '__main__.B'>, <class '__main__.C'>]
any class that inherits from Mixin is automatically available in __subclasses__ and you don't have to manually maintain the list of "Known" instances.
