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One use case I don't see covered is grouping by python versions. Sometimes "soft" dependencies are only available/supported/not-broken on certain python versions.

It'd be nice to be able to mark a dependency as being conditional based on some expression, e.g. `$PYTHON_VERSION_MAJOR >= 3`.

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BTW, you can do that already with requirements.txt. See https://stackoverflow.com/questions/19559247/requirements-tx...

Give it time. Moving to a native python DSL will make extending the dependency system more straightforward. Also, if they continue copying the best of Ruby's bundler they will have a way to specify python version/platform specific dependencies.

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