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Python Alternative Implementations

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PyPy
Boo

ExtendingPython

• Children of a Lesser Python
  • CPython's biggest mistake is its lack of a ForeignFunctionInterface

CPython is basically a glue language for assembling programs from C libraries, and to the extent that Jython and IronPython are successful, it's because they're glue languages for assembling Java or CLR components.

In short, CPython isn't just a language implementation, it's a platform API, not unlike the Java VM and libraries.

PyPy

• PyPy

Stackless

• http://www.stackless.com/ --Stackless Python
  Verwendet nicht den C-Stack bei Funkionsaufrufen, Continuations, lightweight threads
• http://python.fyxm.net/peps/pep-0219.html --PEP219?: Stackless Python
• Wiki:ExternalizeTheStack

IronPython

PythonNet

A bridge from CLR to the Python-runtime. No re-implementation.

• http://www.zope.org/Members/Brian/PythonNet

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So far, it seems that the only way to get speed is to attach static type information to some variables. Some compilation avenues do it through information added either in Python source code or in extraneous declarative files, other approaches do it by delaying compilation until such information is discovered at run-time. The former taints the purity of real CPython as the only source. The later often shows spectacular speed gain, but not always, and may bloat size unboudedly. [1]

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• Compyler, compiles python to native code (proof of concept)

CLPython

• http://common-lisp.net/project/clpython/
  • CLPython - an implementation of Python in CommonLisp