Martin Panter <vadmium...@gmail.com> added the comment:

The problem as I understand it is that Msys uses a pipe, but Python by default 
limits interactive REPL mode to terminals only. The same thing happens if you 
start Python on a pipe some other way, for instance “cat | python” vs “cat | 
python -i”.

I would prefer if Python decided to use interactive mode when no file name is 
given, rather than by checking if the file is a terminal. But that would break 
compatibility.

Another tip with Msys: enable unbuffered output with “python -u”. Otherwise 
output gets buffered, won’t be seen immediately, and may be lost if there is an 
unclean exit.

----------
components: +Windows
nosy: +martin.panter, paul.moore, steve.dower, tim.golden, zach.ware

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<https://bugs.python.org/issue34091>
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