Ability replace / ignore sub-dependencies

[VaZark]

In one of my projects, a dependency uses psycopg2 whereas the project already uses a psycopg2-binary.

Besides the redundancy, there are cases when the psycopg2 package does not build on some machines (Macs) and the recommended resolution is to use psycopg2-binary. However, we're unable to find a definitive way to override the subdependency without forking the project (we've raised the issue with the dependency author as well)

It'd be great if we could override/ignore a dependency via poetry as well

[clintonroy]

Poetry aims to build wheels that work within the overall wheel system; wheels do not have a way of overriding dependencies, hence poetry won't do anything special in that regard.

There is talk of adding virtual style dependencies in the works, upstream, that might solve these issues, eventually.