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GH-127682: Only call__iter__ once in generator expressions.#132351

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markshannon merged 6 commits intopython:mainfromfaster-cpython:fix-127682
Apr 11, 2025

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markshannon
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@markshannonmarkshannon commentedApr 10, 2025•
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Removes the extraGET_ITER instruction emitted when creating a generator expression.

This:

  • Allows iterables producing iterators than do not have an__iter__ method to be used in generator expressions, as they were up until 3.12.
  • Makes generator expressions behave the same as all other generators in this regard.

@markshannonmarkshannon merged commitd87e7f3 intopython:mainApr 11, 2025
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@miss-islington-app
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Thanks@markshannon for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

@markshannonmarkshannon deleted the fix-127682 branchApril 11, 2025 08:37
@miss-islington-app
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Sorry,@markshannon, I could not cleanly backport this to3.13 due to a conflict.
Please backport usingcherry_picker on command line.

cherry_picker d87e7f35297d34755026173d84a38eedfbed78de 3.13

@Fidget-Spinner
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Do you need to bump the magic number here? I forgot if compiler-only changes need that.

@brandtbucher
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I don’t think so, since the bytecode format and behavior is unchanged.

efimov-mikhail reacted with thumbs up emoji

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@iritkatrieliritkatrieliritkatriel approved these changes

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