[Distutils] Choice of dependencies?

[John J Lee]

Is it possible for a package to depend on one of several packages, with
the user having the option to pick?  For example, my package P might
depend on package A, plus either package B or package C.

I know I could (ab)use extras_require, but in my case this is a real
dependency rather than an optional extra.  The other option I have is to
just pick one of the dependencies (B or C in my example above), and
thereby force people to install it even though it's not strictly required.
Neither option seems particularly attractive.


John