Martin Panter added the comment:

I would avoid suggesting one can return non-byte-strings; treat that as an 
implementation detail. Maybe something like:

The functions *master_read* and *stdin_read* are passed a file descriptor which 
they should read from, and should return a byte string. The defaults try to 
read 1024 bytes each time they are called. Returning an empty string is be 
interpreted as an EOF condition, and the *_read* function will no longer be 
called.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22865>
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