Track Subclasses in Python

track-subclasses.py

class PluginMount(type):
    def __init__(cls, name, bases, attrs):
        print cls
        if not hasattr(cls, 'plugins'):
            cls.plugins = []
        else:
            print cls.plugins
            cls.plugins.append(cls)
            print cls.plugins
            
class PasswordValidator(object):
    __metaclass__ = PluginMount
    
class SucaValidator(PasswordValidator):
    pass

print SucaValidator.minchia

PasswordValidator.minchia = 'lol'

print SucaValidator.minchia