Provide better suggestions (or install pip automatically) when it is missing

[MikhailArkhipov]

MacOS. Pip is missing. It is unclear to the user what to do...

[MikhailArkhipov]

https://stackoverflow.com/questions/17271319/how-do-i-install-pip-on-macos-or-os-x

[brettcannon]

the problem is the solution varies from OS to OS and that Python should be installed with pip as of a couple versions ago (including Python 2.7).

You also shouldn't be running the system Python that came with your OS, e.g. on macOS you should install Python using Homebrew, on Debian you need to install (I think) python3-pip.

[MikhailArkhipov]

Well, my Mac did not have it although technically it is 2.7.10 but I guess for OS hardening it could be excluded. So basically we need to either provide some easy guidance as a message or, better still, attempt to install it (with user consent, of course).

BTW, I do have 3.6 installed but I suspect we defaulted to 2.7 which came with OS? We may choose to pick the highest instead on the first launch.

[brettcannon]

Actually macOS lacks pip because their version of Python is from 2015.

As for why the OS-installed version got picked up first, maybe because it was first on the PATH and the code checks for python before python3?

[MikhailArkhipov]

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