Is there a way to have a conditional requirements.txt file for my Python application based on platform?

Question

You can add certain conditional requirements after a semi-colon. Particularly useful for sys_platform and python_version.

Examples:

atomac==1.1.0; sys_platform == 'darwin'
futures>=3.0.5; python_version < '3.0'
futures>=3.0.5; python_version == '2.6' or python_version=='2.7'

Apparently you can also exclude particular versions of a library:

futures>=3.0,!=3.0.5

They are defined in PEP 508 and PEP 0345 (Environment Markers) but the syntax appears to follow the draft PEP 0496.