9992 [void@fermat:~/pi]$ nix-shell -p pkgsCross.armv7l-hf-multiplatform.buildPackages.targetPackages.python
  9993
  9994 [nix-shell:~/pi]$ which python
  9995 /nix/store/jg2bac7yy6c1x65fcilicwa85l0qv7ws-python-2.7.15-armv7l-unknown-linux-gnueabihf/bin/python
  9996
  9997 [nix-shell:~/pi]$ python -v
  9998 bash: /nix/store/jg2bac7yy6c1x65fcilicwa85l0qv7ws-python-2.7.15-armv7l-unknown-linux-gnueabihf/bin/python: cannot execute binary file: Exec format error
  9999
 10000 [nix-shell:~/pi]$