[Distutils] Overriding dependency versions

[John Anderson]

If I have a shared dependency between 2 packages but they have pinned
different versions of a 3rd package, is there a way to override this?

Most of the time when people pin a version they are doing it because they
have tested up to that version, but it doesn't always mean they don't work
with a later version.

For example:

P1:
   sqlalchemy==0.7.6

P2:
  sqlalchemy


P3:
   sqlalchemy==0.8



If I want to to override this for all packages and tell them its fine to
just use 0.8.1 and ignore whatever they were pinned at, can I?
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