Dependency matrix testing

Testing matrices for open source Python projects in most cases focuses only on different Python versions and rarely on different operating systems. Not doing your tests and builds on different systems is completely OK for simple projects that are purely Python, and there are no expected system interoperability issues. But some projects, especially distributed as compiled Python extensions, should be definitely tested on various target operating systems. For some open source projects, you may even be forced to use a few independent CI systems to provide builds for just the three most popular ones (Windows, Linux, and macOS). If you are looking for a good example, you can take a look at the small pyrilla project (refer ...

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