[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:

Problems with multiprocessing and tkinter on Mac might have been due to using the default start method, which used to be fork and is now spawn.  This should be retested sometime.

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nosy:  -kbk, roger.serwy
versions: +Python 3.10 -Python 3.8

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<https://bugs.python.org/issue18823>
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