I've been trying to run ./mach doc and been getting the failure:

ModuleNotFoundError: No module named 'pipenv'

See the attached file for the full log.

My python versions are 2.7.17 and 3.7.5

Not sure why this is happening, but just want to note that I'd like to stop using pipenv in mozilla-central. So one possible fix here is to re-write mach doc to not depend on it (though only if an easier fix doesn't present itself).

Also noting that I can't reproduce this on my system.

Can you try to test with this patch?
https://phabricator.services.mozilla.com/D57668

and/or try to remove obj-*/_virtualenvs/

I think this is the first mach command to use both Python 3 and Pipenv.

This and bug 1607470 are DUPEs, from what I can tell.

I drilled it down to the invocation of pip picking up the wrong python interpreter.

(In reply to Sylvestre Ledru [:Sylvestre] from comment #3)

and/or try to remove obj-*/_virtualenvs/

I've already done that.

(In reply to Sylvestre Ledru [:Sylvestre] from comment #2)

Can you try to test with this patch?
https://phabricator.services.mozilla.com/D57668

I still get the same result.

Bug 1607470 fixed this, thank you Axel.