I proposed before something like:
[testenv] deps = py26,py27: kind-of-or py26-django13: kind-of-and
This, however, could look a bit strange when negation is involved:
[testenv] deps = py26-!django13: kind-of-and
The alternatives I see is using
&& (c-like). This, however, will trick users into adding spaces around operators:
[testenv] command = factor1 && factor2: kind-of-and
And if we permit spaces then other users could hit conditional syntax without expecting it. Either way (allowing spaces or not) will cause confusion for someone.
I am currently in favor of using commas and hyphens, without allowing spaces. What do you think? Maybe you have other suggestions?
Anyway, I am willing to implement this once we are set up on the interface.