`conda_extras` (equivalent of `extras`)

[Sylvain Marié]

Tox currently offers a great way to reuse one of the dependencies lists from the setup.py:

in setup.py:

setup(extras_require={
                 'tests_pip': ['requests', 'six']
          },
          ...)

in tox.ini:

[testenv]
extras = tests_pip

Could we imagine to have a conda_extras instruction with exactly the same capability ? (but installing the dependencies with conda of course)