Peter Wu <pe...@lekensteyn.nl> added the comment:

I just ran into this issue on Linux when piping a binary file to stdin resulted 
in a UnicodeDecodeError while trying to read a byte from the stream. Passing 
/dev/stdin is a workaround that does not require modifications to an 
application.

As for the proposed PR 13165, I'd suggest to gracefully fallback to normal 
stdout/stdin if the buffer is not available. That approach is also followed in 
the fileinput module, and takes care of the note for library developers in the 
documentation at https://docs.python.org/3/library/sys.html#sys.stdin

Not feeling particular strong about the graceful handling, but I hope that the 
test code can be simplified in that case.

----------
nosy: +lekensteyn

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<https://bugs.python.org/issue14156>
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