bpo-46655: allow stringized TypeAlias with get_type_hints#31156
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GBeauregard requested review from Fidget-Spinner and gvanrossum as code owners
JelleZijlstra approved these changes Feb 6, 2022
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gvanrossum commented Feb 6, 2022
Do we need backports? |
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miss-islington commented Feb 6, 2022
Thanks @GBeauregard for the PR, and @gvanrossum for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10. |
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miss-islington commented Feb 6, 2022
Sorry, @GBeauregard and @gvanrossum, I could not cleanly backport this to |
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JelleZijlstra commented Feb 6, 2022
PEP 613 TypeAlias was new in 3.10, so let's backport to 3.10. |
GBeauregard added a commit to GBeauregard/cpython that referenced this pull request Feb 6, 2022
…honGH-31156). (cherry picked from commit 77b025b) Co-authored-by: Gregory Beauregard <greg@greg.red>
bedevere-bot commented Feb 6, 2022
GH-31175 is a backport of this pull request to the 3.10 branch. |
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This is a bit weird; it isn't a type, after all. However,
_type_checkis called as part of stringized annotation resolution so all valid typeforms need a code path to get through it or we will cause errors forget_type_hintscalls that may not even be intended to inspect the typeform of issue (e.g. called on a module or class). It also needs to be able to pass through_type_checkif you want the typeform to be able to be contained in anAnnotated(probably not a concern forTypeAlias).The most reasonable way I currently know to reach this is if you called
get_type_hintson a module with a globally definedTypeAlias(that was stringized). See bpo for additional commentary.https://bugs.python.org/issue46655