bpo-45353: Remind sys.modules users to copy when iterating. #28842
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This is true of all dictionaries in Python, but this one tends to catch people off guard as they don't realize when sys.modules might change out from underneath them as a hidden side effect of their code. Copying it first avoids the RuntimeError. An example when this happens in single threaded code are codecs being loaded which are an implicit time of use import that most need not think about.
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Thanks @gpshead for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10. |
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…-28842) This is true of all dictionaries in Python, but this one tends to catch people off guard as they don't realize when sys.modules might change out from underneath them as a hidden side effect of their code. Copying it first avoids the RuntimeError. An example when this happens in single threaded code are codecs being loaded which are an implicit time of use import that most need not think about. (cherry picked from commit 3d1ca86) Co-authored-by: Gregory P. Smith <greg@krypto.org>
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GH-28843 is a backport of this pull request to the 3.10 branch. |
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This is true of all dictionaries in Python, but this one tends to catch people off guard as they don't realize when sys.modules might change out from underneath them as a hidden side effect of their code. Copying it first avoids the RuntimeError. An example when this happens in single threaded code are codecs being loaded which are an implicit time of use import that most need not think about. (cherry picked from commit 3d1ca86) Co-authored-by: Gregory P. Smith <greg@krypto.org>
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This is true of all dictionaries in Python, but this one tends to
catch people off guard as they don't realize when sys.modules might
change out from underneath them as a hidden side effect of their
code. Copying it first avoids the RuntimeError. An example when
this happens in single threaded code are codecs being loaded which
are an implicit time of use import that most need not think about.
https://bugs.python.org/issue45353