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When I run nix-shell
nix-shell ~/dev/nixpkgs -A pythonPackages.some-package
and then edit phases of pythonPackages.some-package, how to reload nix-shell environment with new changes?
Quit nix-shell and rerun is one option, but are there alternatives?
No other simple options, sorry. I can only think of rewriting nix-shell to accomplish what you want. Probably it's not even that hard. Reparse the expression, cleanup the env and refill the env.
New project lorri is built exactly to support this feature. It requires shell.nix file to be present and depends on direnv.
