Implementations of Python

Faster Python implementations

• PyPy
  • AST optimizer of PyPy: astcompiler/optimize.py
• Pyston
• Hotpy and Hotpy 2, based on GVMT (Glasgow Virtual Machine Toolkit)
• Numba: JIT implemented with LLVM, specialized to numeric types (numpy)
• pymothoa uses LLVM (“don’t support classes nor exceptions”)
• WPython: 16-bit word-codes instead of byte-codes
• Cython

Fully Python compliant

• PyPy
• Jython based on the JVM
• IronPython based on the .NET VM
• Unladen Swallow, fork of CPython 2.6, use LLVM. No more maintained
  • Project announced in 2009, abandonned in 2011
  • ProjectPlan
  • Unladen Swallow Retrospective
  • PEP 3146
• Pyjion

Other

• Replace stack-based bytecode with register-based bytecode: old registervm project

Fully Python compliant??

• psyco: JIT. The author of pysco, Armin Rigo, co-created the PyPy project.

Subset of Python to C++

• Nuitka
• Python2C
• Shedskin
• pythran (no class, set, dict, exception, file handling, ...)

Subset of Python

• pymothoa: use LLVM; don’t support classes nor exceptions.
• unpython: Python to C
• Perthon: Python to Perl
• Copperhead: Python to GPU (Nvidia)

Language very close to Python

• Cython: “Cython is a programming language based on Python, with extra syntax allowing for optional static type declarations.”
  • based on Pyrex