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Cameron Laird's personal notes on varieties of Python implementation

Multiple implementations process thePython computer language. Those coming fromJava, C, FORTRAN, and so on might find this unremarkable; it's a striking contrast, though, with Python's most immediate peers:Perl, Ruby,Tcl, ... Eventually I'll analyze the dynamics of this phenomenon. In the meantime, I intend to catalogue the diversity:

• "ActivePythonisActiveState'squality-assured binary build ..."
• "berp is an implementation of Python 3, written in Haskell."
• CPython isGuido van Rossum's reference Python [mention version prospects]
• deeply embeddedpython ...
• DietPython
• Emscriptenexperimentally translates the C of CPython to JavaScript (tothe unholy extent of supporting the ZODB Webscale Editionmonstrosity)
• Enthought's "Enhanced Python"offers even more "batteries" than usual, includingpackages for GUI construction, scientific programming, persistence, visualization, and more.
• Pyrex("It's not full Python but it'sclose", in the words of one colleague)is interesting enough to deserve an entire article of itsown. I hope to write it in 2004 [also be aware of the relatedCython]
• Neil Schemenauer'sgarbage-collected Python
• IronPython[explain; same Jim as with Jython; ...]
• Jython [explain; admiration for achievement of Jim Hugunin and Barry; performance possibilities]
• Movable Python
• Nuitka shocks me.
• Numba is important
• psyco and pyrex (and prothon?)
• "PyMite is a flyweight Python interpreter written from scratch to execute on 8-bit microcontrollers as well as desktop computers..."
• PyPy isreally exciting ... [explain]
• Shed Skin is "an experimental Python-to-C++ compiler".
• Skulpt is an in-browser implementation. [So is Pyjamas.]
• SLOPPY
• I've organized a separate page forStackless Python.
• John Max Skaller aimsVyper at ... [explain] [OCaML] I "It adds tail calls, list comprehensions, lexical scoping, full gc, and pattern matching to Python."
• Will Ware implementsmicrothreads. After earlier independent experiments, he's now folded his efforts on top ofStackless. As ofLeap Day 2000, task switching is not yet pre-emptive. Stackless 1.1 includes a per-thread scheduling hook that simplifies this fix. Warren Postma and other control programmers like the microthreads project for the constraints it should give on thread latency.
• As part of the .NET effort, Mark Hammond and colleagues have re-implementedPython in C#.
• [other]
• a separate but related topic is the gaggle of packages written for Python that implement DbC,multi-methods, functional programming, constraint-based programming, ...
• a special topic, of particular interest to me, is "slenderized" Pythons that fit in harsh environments, including
  • this FTP directory of generations for MS-DOS, OS/2, and so on;
  • Jean-Claude Wippler, Jeff Senn, Brian Lloyd and others have worked on tinyPython. One approach is to exploit "executable compressor"UPX: "This gets python15.dll down to 220K and seems to work for me";
  • [ExplainPyco andPythonD];
  • Pippy is Python for the Palm;
  • [museum]
• "ShedSkin is a Python -> C++ compiler (or translator) written in Python, created by Mark Dufour."