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Python 3.3.0

Release Date: Sept. 29, 2012

Python 3.3 includes a range of improvements of the 3.x series, as well as easier porting between 2.x and 3.x. Major new features in the 3.3 release series are:

  • PEP 380, syntax for delegating to a subgenerator (yield from)
  • PEP 393, flexible string representation (doing away with the distinction between "wide" and "narrow" Unicode builds)
  • A C implementation of the "decimal" module, with up to 120x speedup for decimal-heavy applications
  • The import system (__import__) is based on importlib by default
  • The new "lzma" module with LZMA/XZ support
  • PEP 397, a Python launcher for Windows
  • PEP 405, virtual environment support in core
  • PEP 420, namespace package support
  • PEP 3151, reworking the OS and IO exception hierarchy
  • PEP 3155, qualified name for classes and functions
  • PEP 409, suppressing exception context
  • PEP 414, explicit Unicode literals to help with porting
  • PEP 418, extended platform-independent clocks in the "time" module
  • PEP 412, a new key-sharing dictionary implementation that significantly saves memory for object-oriented code
  • PEP 362, the function-signature object
  • The new "faulthandler" module that helps diagnosing crashes
  • The new "unittest.mock" module
  • The new "ipaddress" module
  • The "sys.implementation" attribute
  • A policy framework for the email package, with a provisional (see PEP 411) policy that adds much improved unicode support for email header parsing
  • A "collections.ChainMap" class for linking mappings to a single unit
  • Wrappers for many more POSIX functions in the "os" and "signal" modules, as well as other useful functions such as "sendfile()"
  • Hash randomization, introduced in earlier bugfix releases, is now switched on by default

See these resources for further information:


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

We currently support these formats for download:

The source tarballs are signed with Georg Brandl's key, which has a key id of 36580288; the fingerprint is 26DE A9D4 6133 91EF 3E25 C9FF 0A5B 1018 3658 0288. The Windows installer was signed by Martin von Löwis' public key, which has a key id of 7D9DC8D2. The Mac installers were signed with Ned Deily's key, which has a key id of 6F5E1540. The public keys are located on the download page.

MD5 checksums and sizes of the released files:

198a64f7a04d1d5e95ce2782d5fd8254  16327785  Python-3.3.0.tgz
b3b2524f72409d919a4137826a870a8f  13781940  Python-3.3.0.tar.bz2
2e7533b4009ac4adae62a7797a442e7a  11720732  Python-3.3.0.tar.xz
9813d8f76b007fffa595abb3a11b3b0f  19367758  python-3.3.0-macosx10.5.dmg
a42dbeb9d17d46b40a6666f496207b4e  19441635  python-3.3.0-macosx10.6.dmg
5129376df1c56297a80e69a1a6144b4e  20508672  python-3.3.0.amd64.msi
70062e4b9a1f959f5e07555e471c5657  19980288  python-3.3.0.msi
e3a31bce895efedd44b1d0db26614344   6353251  python330.chm
a730d8ce509ce666170911a834ef1e2e  27897502
e44e33ab3721014d6ea740553acfa337  22104438
[1]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](1, 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
Gzipped source tarball Source release b8089594cc16003f9ffb3a0c5995c037 64.7 MB SIG
XZ compressed source tarball Source release 2e7533b4009ac4adae62a7797a442e7a 11.2 MB SIG
bzip2 compressed source tarball Source release b3b2524f72409d919a4137826a870a8f 13.1 MB SIG
Mac OS X 32-bit i386/PPC installer macOS for Mac OS X 10.5 and later 9813d8f76b007fffa595abb3a11b3b0f 18.5 MB SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later a42dbeb9d17d46b40a6666f496207b4e 18.5 MB SIG
Windows help file Windows e3a31bce895efedd44b1d0db26614344 6.1 MB SIG
Windows debug information files Windows a730d8ce509ce666170911a834ef1e2e 26.6 MB SIG
Windows x86 MSI installer Windows 70062e4b9a1f959f5e07555e471c5657 19.1 MB SIG
Windows x86-64 MSI installer Windows for AMD64/EM64T/x64 5129376df1c56297a80e69a1a6144b4e 19.6 MB SIG