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Install PyQt on Mac

Installing Python 3 and PyQt5 on Mac OS X with Homebrew.

Homebrew is a package manager for OS X.
It allows to install and manage easily hundreds of “packages” or programs via the command lines.
This method has been tested on OS X Yosemite and works for all versions of OS X.
3 steps are required.

Step 1: installation of XCode

Step 2: installation of Homebrew

Step 3: installation of Python 3 and PyQt5