Ryan Govostes <rgovos...@gmail.com> added the comment:

The origin of this warning involves interleaving read and write operations, and 
was added here: https://bugs.python.org/issue12213

I'm not sure if it applies to sockets, pipes, etc. though.

The pySerial documentation advises using io.BufferedRWPair(x, x) where x is a 
serial device. But this StackOverflow post reports that it is problematic, in 
line with the warning. (The author appears to be talking about Windows.)

https://stackoverflow.com/questions/24498048/python-io-modules-textiowrapper-or-buffererwpair-functions-are-not-playing-nice

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nosy: +benjamin.peterson, pitrou, stutzbach

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