[issue34609] Importing certain modules while debugging raises an exception

[ppperry]

ppperry <mapreader at olum.org> added the comment:

The Pdb bug and the IDLE bug are unrelated to each other:

   Pdb fails because it is attempting to import the readline module every time its `trace_dispatch` is called, and the import implementation is not reentrant in that way.

   IDLE is crashing because the uninitialized _ModuleLock instance raised an error when `repr` is called, and the IDLE debugger lacks code to catch that exception.

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nosy: +ppperry

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34609>
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