from abc import ABC, abstractmethod
class A:
def foo(self): return 'A'
class B:
def foo(self): return 'B'
class C(A, B):
def bar(self): return 'C'
class AbstractThing(ABC):
@abstractmethod
def do(self): pass
class ConcreteThing(AbstractThing):
def do(self): return 'done'
class Meta(type):
def __new__(mcls, name, bases, dct):
dct['created_by_meta'] = True
return super().__new__(mcls, name, bases, dct)
class WithMeta(metaclass=Meta):
pass
class WithMeta2(metaclass=Meta):
def __init__(self):
self.value = 42
def __str__(self):
return f"WithMeta2(value={self.value})"
def change_value(self, new_value):
self.value = new_value
