[New-bugs-announce] [issue26992] 64-bit Python 2.7.11 hangs in 64-bit Windows 10 - CMD and Git Bash

Sam Taylor report at bugs.python.org
Tue May 10 09:20:35 EDT 2016

New submission from Sam Taylor:

We have seen an issue where the 64-bit 2.7.11 Python Interpreter hangs whilst trying to run it in either Command Prompt or Git Bash on 64-bit Windows 10.

The issue is intermittent, the interpreter will run sometimes but will often hang immediately after typing 'python + ENTER' in either of the terminals.  There seems to be no pattern when it won't work.

We haven't seen this issue in 64-bit Windows 8.1.

The workaround was to install the 32-bit version of python 2.7.11 on 64-bit Windows 10 PC's - the interpreter is completely reliable in this case and running 32-bit has no effect on our work.

I haven't found the exact same issue elsewhere on the python bugs forum but similar issues point to Windows 10 dropping some functionality which Windows 8.1 and earlier versions had.

Setting up pseudo terminals does help but is a messy workaround.  Adding and removing PYTHONPATH etc from the environment variables doesn't have any effect.

Everything is working fine so this isn't really an issue.  I'm just interested if anyone else has experienced this and if they can shed any light onto what causes it.

components: Interpreter Core, Windows
messages: 265246
nosy: paul.moore, sam.taylor.bs, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: 64-bit Python 2.7.11 hangs in 64-bit Windows 10 - CMD and Git Bash
type: crash
versions: Python 2.7

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