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Use bundled wheels because the latest pip no longer supports Python 3.5 Bundled libs for pip 9.0.1 and setuptools 28.8.0 are from https://github.com/pypa/pip/blob/9.0.1/pip/_vendor/vendor.txt https://github.com/pypa/setuptools/blob/v28.8.0/pkg_resources/_vendor/vendored.txt