What is the best solution to porting of this many modules?
Should I add all of the modules to this PR, or is it better to merge ported modules in groups in multiple PR's?

@ncoghlan Would you mind reviewing this?

Hi @Traceur759 - sorry for leaving this unreviewed for so long. Now that @ericsnowcurrently's draft internal API for Python-level subinterpreter support has been added, would you be able to come up with a test case for these modules that fails without the patch, and works with it?

It would also be nice to avoid the module state retrieval overhead in the cases where an exception doesn't need to be raised - I know you have a draft PEP for defining static shared exception types, for this PR specifically you could avoid the problem by deferring loading the state until an exception is about to be raised.

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Looks like @Dormouse759 doesn't have a bugs.python.org account associated with that GitHub username, so closing as the CLA isn't signed still. This PR can be re-opened if that changes.

@brettcannon I have renamed my account and forgotten to change the GH name on bugs.python.org.
It should be associated now.

@Dormouse759 thanks for the fix! I've reopened the PEP.

@Dormouse759 I rebased on current master, and I have one more suggestion, which is better expressed as a commit rather than text :)
Do you agree with this extra change in binascii_exec?

@encukou Yes, it seems fine. Thank you.