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[3.13] gh-151955: Allow more ParamSpec bounds - #152122
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JelleZijlstra
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June 24, 2026 19:53
gaborbernat
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…911) On Python 3.12 and 3.13 before 3.13.16, an unbound [`ParamSpec`](https://docs.python.org/3/library/typing.html#typing.ParamSpec) rendered with a `bound="None"` it never had. 🐛 For `def call(func: Callable[P, int])`: ```diff - **func** ("Callable"["ParamSpec"("P", bound="None"), "int"]) -- - the function to call + **func** ("Callable"["ParamSpec"("P"), "int"]) -- the function + to call ``` Those interpreters store `NoneType` as the bound, fixed upstream in [CPython gh-151955](python/cpython#151955) and [backported to 3.13](python/cpython#152122). #867 already skips it in a generic's header; the annotation renderer now drops it too. A real bound such as `bound=str` still shows.
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Backport of gh-151956 to 3.13.