How to specify dependency to subprocess32?

[guettli]

I have a library (subx) which depends on subprocess32.

My library needs the timeout kwarg.

I need subprocess32 only if the target platform is Python2.x.

How should I define the dependency in my project?

I get this error message, if I define a dependency to subprocess32 via "install_requires" (setup.py) and I am inside a python3 virtualenv:

===> pip install -e git+https://github.com/guettli/subx.git#egg=subx
Obtaining subx from git+https://github.com/guettli/subx.git#egg=subx
  Cloning https://github.com/guettli/subx.git to ./src/subx
Collecting subprocess32 (from subx)
  Using cached subprocess32-3.2.7.tar.gz
    Complete output from command python setup.py egg_info:
    This backport is for Python 2.x only.
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-lju3nl1y/subprocess32/

Same question here: https://stackoverflow.com/questions/47098185/dependency-management-subprocess32-needed-for-python2-7

[nirs]

This may work:

install_requires = ["subprocess32] if sys.version_info[0] == 2 else []

[gpshead]

Something conditional like that makes sense. I also recently made subprocess32 install as a dummy module that simply acts as an alias for subprocess on Python 3 but that is currently only available in the 3.5.0rc1 release which pip won't pickup by default. Once I publish 3.5.0 it'll be available everywhere.

f43fa11

[guettli]

@gpshead yes, make subprocess32 install as a dummy sounds good. Thank you

[guettli]

For me (creator of this issue) this is solved. Please reopen if you think not.