Setuptools platform specific dependencies

Question

Is there any way to tell setuptools or distribute to require a package on a specific platform?

In my specific case, I\'m using readline, which comes as par

Answer 1

from setuptools import setup


setup(
    install_requires=(['pymsgbox', 'PyTweening>=1.0.1', 'Pillow', 'pyscreeze']
                    + ["python3-xlib; sys_platform == linux"]
                    + ["python-xlib; sys_platform == linux2"]
                    + ["pyobjc-core; sys_platform == darwin"]
                    + ["pyobjc; sys_platform == darwing"]
                    ),
)

This will install speicific versions of libraries depending on whether its linux2 (for a linux system using python2), linux (for a linux system using python3), darwin (for a MacOS system)