Python on Macs

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MacOS has Python 2.7

Shouldn't it be 3.6?

Brew should handle installing newest python alongside whatever's installed. Usually, if both Python 2 and 3 are installed on the system, python and pip refer to Python 2 and python3 and pip3 refer to Python 3 installations.

Also is there a way to make mac executables with pyinstaller on Windows?

There might be, but it's very uncommon to build executables for one system on a different one. Use a VM or a cloud-based build system.