[issue34091] REPL does not work in msys2, ConEmu terminals on windows

[Segev Finer]

Segev Finer  added the comment:

I'd assume this is using ConEmu's ChildGui which means it hacks up a MinTTY 
window to appear inside ConEmu's GUI. MinTTY doesn't use a real terminal but 
rather pipes as the processes stdio. Any native (non-MSYS2) Windows program 
would have a problem with this.

The known workaround is to launch such programs using WinPTY (Available in the 
MSYS2 pacman), which creates a real console for the program in the background 
and communicates it's input/output so that it appear in the original console.

Sadly that is a limitation of Windows, as Windows does not supply a proper PTY 
interface and MSYS2/MinTTY choose not to use something like WinPTY by default.

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nosy: +Segev Finer

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[issue34091] REPL does not work in msys2, ConEmu terminals on windows

[Maximilian Nöthe]

Maximilian Nöthe  added the comment:

Tab completion does not work in the REPL even when started with `-i -u`, so 
there might be a deeper problem than just the PIPE that's preventing python 
from starting in interactive mode.

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[issue34091] REPL does not work in msys2, ConEmu terminals on windows

[Eric V. Smith]

Change by Eric V. Smith :


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nosy: +eric.smith

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[issue34091] REPL does not work in msys2, ConEmu terminals on windows

[Martin Panter]

Martin Panter  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.

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

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[issue34091] REPL does not work in msys2, ConEmu terminals on windows

[Maximilian Nöthe]

New submission from Maximilian Nöthe :

The REPL won't start in interactive mode, it only starts when explicitly given 
the `-i` option. 

The problems IPython is having, e.g. missing syntax highlighting and no tab 
completion should have the same root.

See this issue for mingw:
https://github.com/Alexpux/MINGW-packages/issues/730

They fixed it by patching python using this patch:
https://github.com/Alexpux/MINGW-packages/blob/master/mingw-w64-python3/1700-cygpty-isatty.patch

And this issue at msys2:
https://sourceforge.net/p/msys2/tickets/32/

--
messages: 321417
nosy: maxnoe
priority: normal
severity: normal
status: open
title: REPL does not work in msys2, ConEmu terminals on windows
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8

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