PEP 508 already allows parenthesized expressions with 'and' and 'or' for environment markers, so that's probably the most relevant prior art. I doubt '|' will be added at this point. On Dec 14, 2017 09:08, "Chris Barker - NOAA Federal" <chris.barker@noaa.gov> wrote:

Sorry to lose the thread — lousy iPhone mail app...

Conda supports or in its meta.yaml format:

https://conda.io/docs/user-guide/tasks/build-packages/ package-spec.html#build-version-spec

Maybe look to that for prior art?

And it would be mildly less confusing to have consistency between the systems.

-Chris

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