>> I haven't tested yet (and someone should) that it does all JUST WORK,
>> but thats easy: put an environment marker in a requirements.txt file
>> like so:
>> 
>>  argparse; python_version < '3'

> I think the last time this came up the feature wasn't available in pip
> yet, and so using separate files was the work-around. Are environment
> markers fully supported by pip/setuptools/whatever now?

Yeah, I developed this feature for OpenStack. My change was merged into pip 6.0:
https://github.com/pypa/pip/pull/1472

I forgot to finish the work in OpenStack. I don't know where the pip 
requirement is specified: we need at least pip 6.0.

Victor

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