Python 2.7 no longer succeeds on macOS

[pinkwah]

Homebrew has removed the flask for 2.7 some time ago (Homebrew/homebrew-core#49796) and now macOS builds are failing because they're trying to use the system python.

Is there any reason to keep this version around? Suggest to remove 2.7 examples from readme.

[mattip]

I could not find where this repo is using brew to install CPython. The install_mac_cpython function uses curl and installer to download CPython from python.org. Which builds are failing?

This repo is used by many projects to build wheels which are then uploaded to PyPI, so the question "is python2.7 needed" becomes "is python2.7 needed to create PyPI wheels". The latest PyPI download statistics, as discussed on a python forum show that as far as PyPI goes, python2.7 is still very alive.

[pinkwah]

I have created an example which fails on 2.7 but not 3.7:

Repo: https://github.com/dotfloat/multibuild-py2
Travis: https://travis-ci.org/dotfloat/multibuild-py2

Python 2.7 build is failing with:

multibuild/osx_utils.sh: line 398: delocate-wheel: command not found

[matthew-brett]

I think this one is fixed now after @gaborbernat's very efficient work in finding / fixing the problem and making a new release of virtualenv, over at pypa/virtualenv#1641. Can you confirm this works for your build?

[pinkwah]

The build passes. Thanks!