René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test added in gh-104067 has an fstring with an invalid escape sequence","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\nIn response to #104049, a fix and a new test were added in #104067 and related PRs. The test [in test_httpserver.py](https://github.com/python/cpython/pull/104067/files#diff-5c8de474c50a44ead423e2d9ce85c1932b9c87ba9f5a3215c0b8b996c65e62b9R424) uses an fstring with an escape sequence, but does not use `r`:\r\n```\r\nf'listing for {self.base_url}/\\?x=123'\r\n```\r\n\r\nI think the code (in two places) should be include an `r`: `fr'listing for ...`\r\n\r\nOn PyPy this is causing the `test___all__.py` test to fail, since it emits a warning when compiling the `*.py` to `*.pyc`. I am not sure why CPython is not seeing a similar problem. Perhaps `compileall` is run first? Or the warning filter captures the compilation as well as the import?\r\n\r\n# Your environment\r\n\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: PyPy3.9 HEAD using stdlib 3.9.17\r\n- Operating system and architecture: any\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/mattip","@type":"Person","name":"mattip"},"datePublished":"2023-06-14T14:29:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/105784/cpython/issues/105784"}