__init__.py 文件源码

def patch(self, orig, replace):
        if not hasattr(self, '__patches'):
            self.__patches = []
            self.addCleanup(unpatch, self)

        f = inspect.stack()[1][0]

        parts = orig.split('.')

        v = f.f_globals.copy()
        v.update(f.f_locals)

        orig = v[parts[0]]

        for part in parts[1:-1]:
            orig = getattr(orig, part)

        to_replace = getattr(orig, parts[-1])

        self.__patches.append((orig, parts[-1], to_replace))

        setattr(orig, parts[-1], replace)