macOS installation troubles: python@2 is now gone from Homebrew

[nox]

The python@2 formula has been removed from Homebrew, and system's Python 2 doesn't come with pip, so pip install virtualenv fails.

[nox]

I used this to reinstall virtualenv for system's Python 2.

[nox]

By "this" I meant https://gist.github.com/haircut/14705555d58432a5f01f9188006a04ed. It helps if I actually paste the link.

[jdm]

For posterity's sake: Homebrew/homebrew-core#49796

[jdm]

We might be able to get by with https://github.com/drolando/homebrew-deadsnakes if we don't want to go all-in on python 3 yet.

[nicoabie]

For future reference: servo needs pip and virtualenv in version 2.7 of python
Without them the following error will be displayed
Python virtualenv is not installed. Please install it prior to running mach.

To overcome this run use easy install to get pip in version 2.7 of python
sudo easy_install pip
Then
pip install virtualenv