[issue18823] Idle: use pipes instead of sockets to talk with user subprocess

[Terry J. Reedy]

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

#34313 reports problems with multiprocessing when using at least some versions of tkinter on some versions of macOS.

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versions: +Python 3.8 -Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue18823>
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