[issue45353] sys.modules: dictionary changed size during iteration

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

In #13487, Gregory fixed the problem by using .copy().  That seems to have worked for 1 1/2 years.  You still have not reported an actual bug in the current CPython stdlib.

Perhaps we should mention in https://docs.python.org/3/library/sys.html#sys.modules that sys.modules can be unexpectedly changed during iteration by lazy imports or other threads, so that a copy might be needed.

Gregory, what do you think?

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nosy: +gregory.p.smith

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