Python 对象属性的查找顺序

def get_attribute(obj, name):
    class_definition = obj.__class__
 
    descriptor = None
    for cls in class_definition.mro():
        if name in cls.__dict__:
            descriptor = cls.__dict__[name]
            break
 
    if hasattr(descriptor, '__set__'):
        return descriptor, 'data descriptor'
 
    if name in obj.__dict__:
        return obj.__dict__[name], 'instance attribute'
 
    if descriptor is not None:
        return descriptor, 'non-data descriptor'
    else:
        raise AttributeError