test_codecs.py 文件源码

def setUp(self):
        # There's no way to unregister a codec search function, so we just
        # ensure we render this one fairly harmless after the test
        # case finishes by using the test case repr as the codec name
        # The codecs module normalizes codec names, although this doesn't
        # appear to be formally documented...
        # We also make sure we use a truly unique id for the custom codec
        # to avoid issues with the codec cache when running these tests
        # multiple times (e.g. when hunting for refleaks)
        unique_id = repr(self) + str(id(self))
        self.codec_name = encodings.normalize_encoding(unique_id).lower()

        # We store the object to raise on the instance because of a bad
        # interaction between the codec caching (which means we can't
        # recreate the codec entry) and regrtest refleak hunting (which
        # runs the same test instance multiple times). This means we
        # need to ensure the codecs call back in to the instance to find
        # out which exception to raise rather than binding them in a
        # closure to an object that may change on the next run
        self.obj_to_raise = RuntimeError