将动态属性添加到类,而不是实例

我正在寻找一种向类(而不是实例)添加动态属性的方法。就像Django对待模特经理人一样。基本上我想达到的是:

class Manager:
    def __init__(self, table_name):
        self.table_name = table_name
    # rest omitted for brevity

class BaseModel:
    # somehow create a new instance of Manager
    # and send the init param based off BaseModel's child
    # class table_name Meta property

class MyModel(BaseModel):
    class Meta:
        table_name = 'my_table'

MyModel.manager    # should return an instance of Manager(table_name='my_table')

我试过用构造器( __new__ ),但这显然只在我至少创建了 MyModel .