[Distutils] Overriding dependency versions

[Marcus Smith]

> 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?
>
>
pip requirement files do this.
items in the requirement file override found dependency versions.
http://www.pip-installer.org/en/latest/cookbook.html#requirements-files

Marcus
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