New submission from Christian Heigele <>:


I have two machines, both Windows 10, both with python 2.7.12 (bug is also 
reproducible with 2.7.14), one of them has the Fall creator update (-> version 
1709) and one doesn't (->version 1607). 

When I execute the checkout on some executable that is available on both 
machines, I get different behaviours: One the one without the fall creator 
update I get the output of that executable as expected as the return value. One 
the machine with the update I see a new command line window popping up, the 
executable runs through, and the return value of check_output is an empty 

I'll use it like follow:

f = subprocess.check_output(['svn.exe', '--help'])

components: Windows
messages: 311875
nosy: Christian Heigele, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: subprocess.check_output opens an unwanted command line window after fall 
creator update
versions: Python 2.7

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