Python.

Download PythonThe current production versions are Python 2.6.5 and Python 3.1.2.Start with one of these versions for learning Python or if you want the most stability; they're both considered stable production releases.If you don't know which version to use, start with Python 2.6.5; more existing third party software is compatible with Python 2 than Python 3 right now.For the MD5 checksums and OpenPGP signatures, look at the detailed Python 2.6.5 page:•Python 2.6.5 Windows installer (Windows binary -- does not include source)•Python 2.6.5 Windows X86-64 installer (Windows AMD64 / Intel 64 / X86-64 binary [1] -- does not include source)•Python 2.6.5 Mac OS X Installer Disk Image (for Mac OS X 10.3 through 10.6)•Python 2.6.5 compressed source tarball (for Linux, Unix or OS X)•Python 2.6.5 bzipped source tarball (for Linux, Unix or OS X, more compressed)Also look at the detailed Python 3.1.2 page:•Python 3.1.2 Windows x86 MSI Installer (Windows binary -- does not include source)•Python 3.1.2 Windows X86-64 MSI Installer (Windows AMD64 / Intel 64 / X86-64 binary [1] -- does not include source)•Python 3.1.2 Mac OS X Installer Disk Image (for Mac OS X 10.3 through 10.6)•Python 3.1.2 compressed source tarball (for Linux, Unix or OS X)•Python 3.1.2 bzipped source tarball (for Linux, Unix or OS X, more compressed)There is also a preview release of Python 2.7 available.A comprehensive list of all released versions is available if you need source code for an older version of Python.Other parties have re-packaged Python. These re-packagings often include more libraries or are specialized for a particular application:•ActiveState ActivePython (not open source)•Enthought Python Distribution (a commercial distribution for scientific computing)•Portable Python (Python and add-on packages configured to run off a portable device)•PyIMSL Studio (a commercial distribution for numerical analysis – free for non-commercial use)