Python 3.7 fails to build on OSX with 404

3.7.3 is not installed; attempting download
Downloading archive: https://storage.googleapis.com/travis-ci-language-archives/python/binaries/osx/10.13/x86_64/python-3.7.3.tar.bz2
0.14s$ curl -sSf -o python-3.7.3.tar.bz2 ${archive_url}
curl: (22) The requested URL returned error: 404 
Unable to download 3.7.3 archive. The archive may not exist. Please consider a different version.

We don’t support Python builds on the Mac.

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