def overridden(method):
"""
:return: True if ``method`` overrides some method with the same
name in a base class. This is typically used when defining
abstract base classes or interfaces, to allow subclasses to define
either of two related methods:
>>> class EaterI:
... '''Subclass must define eat() or batch_eat().'''
... def eat(self, food):
... if overridden(self.batch_eat):
... return self.batch_eat([food])[0]
... else:
... raise NotImplementedError()
... def batch_eat(self, foods):
... return [self.eat(food) for food in foods]
:type method: instance method
"""
# [xx] breaks on classic classes!
if isinstance(method, types.MethodType) and compat.get_im_class(method) is not None:
name = method.__name__
funcs = [cls.__dict__[name]
for cls in _mro(compat.get_im_class(method))
if name in cls.__dict__]
return len(funcs) > 1
else:
raise TypeError('Expected an instance method.')
def overridden(method):
"""
:return: True if ``method`` overrides some method with the same
name in a base class. This is typically used when defining
abstract base classes or interfaces, to allow subclasses to define
either of two related methods:
>>> class EaterI:
... '''Subclass must define eat() or batch_eat().'''
... def eat(self, food):
... if overridden(self.batch_eat):
... return self.batch_eat([food])[0]
... else:
... raise NotImplementedError()
... def batch_eat(self, foods):
... return [self.eat(food) for food in foods]
:type method: instance method
"""
# [xx] breaks on classic classes!
if isinstance(
method,
types.MethodType) and compat.get_im_class(method) is not None:
name = method.__name__
funcs = [
cls.__dict__[name] for cls in _mro(compat.get_im_class(method))
if name in cls.__dict__
]
return len(funcs) > 1
else:
raise TypeError('Expected an instance method.')
