[issue19973] Deprecate pyio

[STINNER Victor]

STINNER Victor added the comment:

> We tried a pure python implementation of io once.  Didn't go so well.  :p

It is _pyio.

Note: _pyio is not 100% *pure* Python, it relies on FileIO which is implemented in C. I always found this surprising. One day I will maybe rewrite it using os.read() and os.write() :-)

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