在许多类上定义相同的方法重写:DRY?

使用三个参数 type 定义类,然后将它们设置为 the module's global dictionary :

todefine = [('MyAbcClass', AbcClass), ...]
for name, base in todefine:
    globals()[name] = type(name, (MyMixin, base), {})

如果要定义的名称遵循您给定的固定模式(`“My”+基类名称),则可以通过动态构造要定义的名字来减少重复:

todefine = [AbcClass, ...]
for base in todefine:
    name = "My" + base.__name__
    globals()[name] = type(name, (MyMixin, base), {})

如果您试图包装给定模块中的所有类,甚至可以通过内省模块生成来避免显式列出类 todefine 编程(如果您知道模块有或没有 __all__ 您可以只使用适当的方法,而不是尝试一种方法并默认另一种方法):

import inspect
try:
    # For modules that define __all__, we want all exported classes
    # even if they weren't originally defined in the module
    todefine = filter(inspect.isclass, (getattr(somemodule, name) for name in somemodule.__all__))
except AttributeError:
    # If __all__ not defined, heuristic approach; exclude private names
    # defined with leading underscore, and objects that were imported from
    # other modules (so if the module does from itertools import chain,
    # we don't wrap chain)
    todefine = (obj for name, obj in vars(somemodule).items() if not name.startswith('_') and inspect.isclass(obj) and inspect.getmodule(obj) is somemodule)