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Release Date: April 9, 2012

Note: A newer bugfix release, 2.7.4, is currently available. Its use is recommended over previous versionsof 2.7.

Python 2.7.3 was released on April 9, 2012. 2.7.3 includes fixes for severalreported security issues in 2.7.2: issue 13703 (oCERT-2011-003, hashcollision denial of service), issue 14234 (CVE-2012-0876, hash tablecollisions CPU usage DoS in the expat library), issue 14001 (CVE-2012-0845,SimpleXMLRPCServer denial of service), and issue 13885 (CVE-2011-3389,disabling of the CBC IV attack countermeasure in the _ssl module).

The Python 2.7 series is scheduled to be the last major version in the 2.xseries before 2.x moves into an extended maintenance period. The 2.7 seriescontains many of the features that were first released in Python 3.1.Improvements in this release include:

Release Date: April 9, 2012 Note: A newer bugfix release, 2.7.4, is currently available.Its use is recommended over previous versions of 2.7. Python 2.7.3 was released on April 9, 2012. 2.7.3 includes fixes for several reported security issues in 2.7.2: issue 13703 (oCERT-2011-003, hash collision denial of service), issue 14234 (CVE-2012-0876, hash table collisions CPU usage DoS.

• An ordered dictionary type
• New unittest features including test skipping, new assert methods, and testdiscovery
• A much faster io module
• Automatic numbering of fields in the str.format() method
• Float repr improvements backported from 3.x
• Tile support for Tkinter
• A backport of the memoryview object from 3.x
• Set literals
• Set and dictionary comprehensions
• Dictionary views
• New syntax for nested with statements
• The sysconfig module

See these resources for further information:

• Change log for this release.
• Report bugs at http://bugs.python.org.
• Help fund Python and its community.

This is a production release. Please report any bugsyou encounter.

We currently support these formats for download:

• Mac OS X 64-bit/32-bit x86-64/i386 Installer (2.7.3) for Mac OS X 10.6 and 10.7[2](sig).[You may need an updated Tcl/Tk install to run IDLE or use Tkinter,see note 2 for instructions.]
• Mac OS X 32-bit i386/PPC Installer (2.7.3) for Mac OS X 10.3 through 10.6[2](sig).

The source tarballs are signed with Benjamin Peterson's key (fingerprint: 12EF3DC3 8047 DA38 2D18 A5B9 99CD EA9D A413 5B38). The Windows installer was signedby Martin von Löwis' public key, which has a key id of 7D9DC8D2. The Macinstallers were signed with Ned Deily's key, which has a key id of 6F5E1540.The public keys are located on the download page.

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MD5 checksums and sizes of the released files:

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