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Free open-source portable distribution of Python for Windows targeted at educational and scientific usage.
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Pros
Pro Portable (but can be registered)
Can be installed without any integration into Windows. This makes it possible to have many different installations in parallel (Python 2 and 3, 32-bit and 64-bit). If needed, there is a Control Panel that let's you register a specific installation to Windows.
Pro Free and open-source
It's released with the MIT license. Sources are available on GitHub, distributions on SourceForge.
Pro Many integrated packages
Just to name a few: NumPy, SciPy, Sympy, Matplotlib, Pandas, pyqtgraph, cython, Jupyter
Pro Package Manager
The WinPython Package Manager provides a useful GUI to install or update packages. Naturally you can also simply use pip.
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