# Pastebin QhArKwpF $ nix-shell . New python executable in /sharedhome/home/james/tmp/venv/bin/python2.7 Not overwriting existing python script /sharedhome/home/james/tmp/venv/bin/python (you must use /sharedhome/home/james/tmp/venv/bin/python2.7) Installing pip, wheel... done. Traceback (most recent call last): File "/home/james/tmp/venv/bin/pip", line 5, in from pip._internal.cli.main import main ImportError: No module named main