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Python 3.1.3

Release Date: Nov. 27, 2010

Note: It is recommended that you use the latest bug fix release of the 3.1 series, 3.1.4.

Python 3.1.3 was released on November 27th, 2010.

The Python 3.1 version series is a continuation of the work started by Python 3.0, the new backwards-incompatible series of Python. For ongoing maintenance releases, please see the Python 3.2 series. Improvements in this release include:

  • An ordered dictionary type
  • Various optimizations to the int type
  • New unittest features including test skipping and new assert methods.
  • A much faster io module
  • Tile support for Tkinter
  • A pure Python reference implementation of the import statement
  • New syntax for nested with statements

See these resources for further information:

Help fund Python and its community by donating to the Python Software Foundation.


This is a production release. Please report any bugs you may encounter to

We currently support these formats for download:

The source tarballs are signed with Benjamin Peterson's key (fingerprint: 12EF 3DC3 8047 DA38 2D18 A5B9 99CD EA9D A413 5B38). The Windows installers are signed with Martin von Löwis' public key which has a key id of 7D9DC8D2. The Mac disk image was signed by Ronald Oussoren's public key which has a key id of E6DF025C. The public keys are located on the download page.

MD5 checksums and sizes of the released files:

d797fa6abe82c21227e328f05a535424  11769584  Python-3.1.3.tgz
ad5e5f1c07e829321e0a015f8cafe245   9875464  Python-3.1.3.tar.bz2
e2190c128dd1ebc1364d11f65f9a9560  12695522
5a612090f2f9c9e3ac54c69735de78a9  13522914
c077495e19641111534b974107d6b8d3  14549504  python-3.1.3.amd64.msi
736d8b583d553237dd602461f43dfa65  14300160  python-3.1.3.msi
7c56fb34443ad74a76c5a119f2f7c485  17533819  python-3.1.3-macosx10.3.dmg
[1](1, 2) The binaries for AMD64 will also work on processors that implement the Intel 64 architecture (formerly EM64T), i.e. the architecture that Microsoft calls x64, and AMD called x86-64 before calling it AMD64. They will not work on Intel Itanium Processors (formerly IA-64).
[2]There is important information about IDLE, Tkinter, and Tcl/Tk on Mac OS X here.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
bzip2 compressed source tarball Source release ad5e5f1c07e829321e0a015f8cafe245 9875464 SIG
Gzipped source tarball Source release b258ed06a75306bdc143d96337d06e0c 51343360 SIG
Mac OS X 32-bit i386/PPC installer Mac OS X for Mac OS X 10.3 and later 7c56fb34443ad74a76c5a119f2f7c485 17533819 SIG
Windows debug information files Windows e2190c128dd1ebc1364d11f65f9a9560 12695522 SIG
Windows x86-64 MSI installer Windows for AMD64/EM64T/x64, not Itanium processors c077495e19641111534b974107d6b8d3 14549504 SIG
Windows x86 MSI installer Windows 736d8b583d553237dd602461f43dfa65 14300160 SIG