Portable Python - Minimum bare bones portable python distribution with PyScripter as development environment.
PyCharm - Python & Django IDE with intelligent code completion, on-the-fly error checking, quick-fixes, and much more...
WinPython - The easiest way to run Python, Spyder with SciPy and friends out of the box on any Windows PC...
Thonny - Python IDE for beginners
Anaconda - Anaconda is the leading open data science platform powered by Python.
Spyder - The Scientific Python Development Environment