"Implementation" here means ... There have been and are several distinct implementations of what we all recognize as Python, or occasionally a variant of Python:

• ActivePython

• ["CPython"]
• ["IPython"] and its ["IPyKit"] variant

• IronPython

• ["Jython"]

• PyMite

• PyPy

• [http://www.mhuffman.com/resource/index.html Tiny Python]

• ...

This page aims to replace one formerly maintained as "[http://phaseit.net/claird/comp.lang.python/python_varieties.html Cameron Laird's personal notes on varieties of Python implementation]".