[Nix-dev] multiple versions of the same software? / collisions

[Daniel Hlynskyi]

I can be mistaken, but nix-env dash-splits name to get name without
version, and uses it to upgrade or sideinstall into environment. This works
bad for python, because python34 and python35 are separate expressions,
treated as one in nix-env.

You can override the name of package in .nixpkgs/config.nix for a
workaround, but i guess you want nix-shell in this case.
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