René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"pickling fails for typing.Tuple[()]","articleBody":"\u003c!--\r\n  If you're new to Python and you're not sure whether what you're experiencing is a bug, the CPython issue tracker is not\r\n  the right place to seek help. Consider the following options instead:\r\n\r\n  - reading the Python tutorial: https://docs.python.org/3/tutorial/\r\n  - posting in the \"Users\" category on discuss.python.org: https://discuss.python.org/c/users/7\r\n  - emailing the Python-list mailing list: https://mail.python.org/mailman/listinfo/python-list\r\n  - searching our issue tracker (https://github.com/python/cpython/issues) to see if\r\n    your problem has already been reported\r\n--\u003e\r\n\r\n**Bug report**\r\n\r\nA clear and concise description of what the bug is.\r\nInclude a minimal, reproducible example (https://stackoverflow.com/help/minimal-reproducible-example), if possible.\r\n\r\n```\r\nimport pickle\r\nfrom typing import Tuple\r\n\r\nj = Tuple[()]\r\nserialized = pickle.dumps(j)\r\nloaded = pickle.loads(serialized)\r\n```\r\n\r\nError message:\r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"/Users/ryanthompson/PycharmProjects/learningProjects/dill_regression/regression_test.py\", line 6, in \u003cmodule\u003e\r\n    loaded = dill.loads(serialized)\r\n  File \"/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/site-packages/dill/_dill.py\", line 387, in loads\r\n    return load(file, ignore, **kwds)\r\n  File \"/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/site-packages/dill/_dill.py\", line 373, in load\r\n    return Unpickler(file, ignore=ignore, **kwds).load()\r\n  File \"/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/site-packages/dill/_dill.py\", line 646, in load\r\n    obj = StockUnpickler.load(self)\r\n  File \"/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py\", line 804, in __getitem__\r\n    return self.__getitem_inner__(params)\r\n  File \"/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py\", line 261, in inner\r\n    return func(*args, **kwds)\r\n  File \"/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py\", line 830, in __getitem_inner__\r\n    params = tuple(_type_check(p, msg) for p in params)\r\n  File \"/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py\", line 830, in \u003cgenexpr\u003e\r\n    params = tuple(_type_check(p, msg) for p in params)\r\n  File \"/Users/ryanthompson/.pyenv/versions/3.8.11/lib/python3.8/typing.py\", line 149, in _type_check\r\n    raise TypeError(f\"{msg} Got {arg!r:.100}.\")\r\nTypeError: Tuple[t0, t1, ...]: each t must be a type. Got ().\r\n\r\n\r\n```\r\n\r\n**Your environment**\r\npython 3.8\r\n\u003c!-- Include as many relevant details as possible about the environment you experienced the bug in --\u003e\r\n\r\n- CPython versions tested on:\r\n3.6 \u0026 3.8\r\n- Operating system and architecture:\r\nMac OS\r\n\r\n\u003c!--\r\nYou can freely edit this text. Remove any lines you believe are unnecessary.\r\n--\u003e\r\n","author":{"url":"https://github.com/ryanthompson591","@type":"Person","name":"ryanthompson591"},"datePublished":"2022-06-24T20:37:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/94245/cpython/issues/94245"}