Jan Lachnitt <pepalo...@seznam.cz> added the comment:

@eryksun: Sorry for my late reply, apparently I did not have time to reply in 
2017. I see your point, but still I think that Python is conceptually 
multi-platform, so its behavior on Linux and Windows should be as much 
consistent as possible.

I am not the one to decide which one of the two possible behaviors shall be the 
correct one. The current documentation 
<https://docs.python.org/3/library/subprocess.html#subprocess.Popen> describes 
the behavior on Linux: "In particular, the function looks for executable (or 
for the first item in args) relative to cwd if the executable path is a 
relative path." If this is chosen as the correct behavior, then the behavior on 
Windows is incorrect.

@Damon Atkins: Thank you for reminding this issue, but I suspect your proposed 
solution of being thread-unsafe. I propose another solution: On Windows, Python 
should resolve the executable path itself (taking cwd and env into account) and 
then pass the absolute path to CreateProcess().

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<https://bugs.python.org/issue15533>
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