gh-119180: Avoid going through AST and eval() when possible in annotationlib#124337
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…onlib module scope We were sometimes passing None as the globals argument to eval(), which makes it inherit the globals from the calling scope. Instead, ensure that globals is always non-None. The test was passing accidentally because I passed "annotationlib" as a module object; fix that. Also document the parameters to ForwardRef() and remove two unused private ones.
…s and eval() Often, ForwardRefs represent a single simple name. In that case, we can avoid going through the overhead of creating AST nodes and code objects and calling eval(): we can simply look up the name directly in the relevant namespaces.
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vstinner approved these changes Sep 24, 2024
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Co-authored-by: Victor Stinner <vstinner@python.org>
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JelleZijlstra commented Sep 24, 2024
Thanks @vstinner for the review! |
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AlexWaygood approved these changes Sep 25, 2024
emilyemorehouse added a commit to lysnikolaou/cpython that referenced this pull request Sep 26, 2024
* main: (69 commits) Add "annotate" SET_FUNCTION_ATTRIBUTE bit to dis. (python#124566) pythongh-124412: Add helpers for converting annotations to source format (python#124551) pythongh-119180: Disallow instantiation of ConstEvaluator objects (python#124561) For-else deserves its own section in the tutorial (python#123946) Add 3.13 as a version option to the crash issue template (python#124560) pythongh-123242: Note that type.__annotations__ may not exist (python#124557) pythongh-119180: Make FORWARDREF format look at __annotations__ first (python#124479) pythonGH-58058: Add quick reference for `ArgumentParser` to argparse docs (pythongh-124227) pythongh-41431: Add `datetime.time.strptime()` and `datetime.date.strptime()` (python#120752) pythongh-102450: Add ISO-8601 alternative for midnight to `fromisoformat()` calls. (python#105856) pythongh-124370: Add "howto" for free-threaded Python (python#124371) pythongh-121277: Allow `.. versionadded:: next` in docs (pythonGH-121278) pythongh-119400: make_ssl_certs: update reference test data automatically, pass in expiration dates as parameters python#119400 (pythonGH-119401) pythongh-119180: Avoid going through AST and eval() when possible in annotationlib (python#124337) pythongh-124448: Update Windows builds to use Tcl/Tk 8.6.15 (pythonGH-124449) pythongh-123884 Tee of tee was not producing n independent iterators (pythongh-124490) pythongh-124378: Update test_ttk for Tcl/Tk 8.6.15 (pythonGH-124542) pythongh-124513: Check args in framelocalsproxy_new() (python#124515) pythongh-101100: Add a table of class attributes to the "Custom classes" section of the data model docs (python#124480) Doc: Use ``major.minor`` for documentation distribution archive filenames (python#124489) ...
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Often, ForwardRefs represent a single simple name. In that case, we can avoid going through the overhead of creating AST nodes and code objects and calling eval(): we can simply look up the name directly in the relevant namespaces.
This PR incorporates the changes from #124326 (which fixes a bug that I discovered while working on this change).