How to install pip and six on macOS with Nix and home-manager

How to install pip and six on macOS with Nix and home-manager.md

Given the following Nix packages (you may be able to install six manually rather than managing it by Nix, but anyway, this was my setup):

pkgs.python310Full
pkgs.python310Packages.six

I would very often run into this situation:

/usr/local/bin/pip: /usr/local/opt/python/bin/python2.7: bad interpreter: No such file or directory

This is because a certain version of pip is hard-coded with a shebang to use the macOS python rather than just the one on your path (your Nix one).

I found the only way forwards was to edit it:

# Find where pip is installed
$ which pip
/usr/local/bin/pip

# Edit it
$ sudo nano /usr/local/bin/pip

I edited it to hard-code the version number of my own installation of pip, and made it use the python on my path, which is Python v3.10.

#!/Users/jamie/.nix-profile/bin/python
# EASY-INSTALL-ENTRY-SCRIPT: 'pip==22.3.1','console_scripts','pip'
__requires__ = 'pip==22.3.1'
import re
import sys
from pkg_resources import load_entry_point

if __name__ == '__main__':
    sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0])
    sys.exit(
        load_entry_point('pip==22.3.1', 'console_scripts', 'pip')()
    )

From there, I tried pip install --upgrade pip as many comments on StackOverflow recommended, but it seemed to no-op.

After that, just:

pip install six

... and then nativescript doctor was happy.

I'd better remove the redundant pkgs.python310Packages.six now, though.