Curl: (22) The requested URL returned error: 404 on MacOS X

I wanted to build a python library with help of cython for MacOS, but before that i just wanted to check if everything is ok.
So first i started with this .travis.yml:
os: osx
language: python

https://docs.travis-ci.com/user/languages/python

Python builds are not available on the macOS and Windows environments.

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