[New-bugs-announce] [issue32245] OSError: raw write() returned invalid length on latest Win 10 Consoles

[Simon Depiets]

New submission from Simon Depiets <sdepiets at gmail.com>:

A couple of users have been having issues on console output since the Fall 2017 Creator Update on Windows 10

An OSError is triggered randomly when rewriting data on the console (typically with progress bars, for instance when you install a module with pip), this only happens with the Microsoft Console (within Powershell or cmd.exe).

It seems the windows stdout console stream returns a length double what python expects. I don't have the skills to go deeper than the bufferedio.c method _bufferedwriter_raw_write to diagnostic the issue, so I've made a very dirty fix (which I do not recommend) https://github.com/python/cpython/compare/3.5...LlianeFR:patch-1

Different unrelated use cases where an error is triggered :

https://stackoverflow.com/questions/47356993/oserror-raw-write-returned-invalid-length-when-using-print-in-python

https://github.com/Microsoft/vscode/issues/39149

----------
components: IO
messages: 307811
nosy: Simon Depiets
priority: normal
severity: normal
status: open
title: OSError: raw write() returned invalid length on latest Win 10 Consoles
type: behavior
versions: Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32245>
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