# 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 <module>
    from pip._internal.cli.main import main
ImportError: No module named main