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Python 3.3.1

Release Date: April 6, 2013

release. It includes hundreds of bugfixes over 3.3.0.

Major new features of the 3.3 series, compared to 3.2

Python 3.3 includes a range of improvements of the 3.x series, as well as easier porting between 2.x and 3.x.

  • 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

More resources


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:

c19bfd6ea252b61779a4f2996fb3b330  16521332  Python-3.3.1.tgz
fb7147a15359a941e0b048c641fd7123  13975626  Python-3.3.1.tar.bz2
993232d9f4d9b4863cc1ec69a792e9cd  11852964  Python-3.3.1.tar.xz
f563b701466bbfddc9e228d6cd894647  26714664
8141a751200213ea6279624120f099d6  22137206
69ad9e442d33e8c2470b2b6c7575d6dd  20758528  python-3.3.1.amd64.msi
8c78e017ba32aafb00f6574c38d0101f  20217856  python-3.3.1.msi
ef3058449389c4b77385e6637a911d87   6596709  python331.chm
ec10c5be176faeda17382d3ce6739f32  19601538  python-3.3.1-macosx10.5.dmg
b208b962515d49c7e236f6dce565a723  19700219  python-3.3.1-macosx10.6.dmg
[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 6a1050d8d9f924d05c499dbebcb8e6a6 65.4 MB SIG
XZ compressed source tarball Source release 993232d9f4d9b4863cc1ec69a792e9cd 11.3 MB SIG
bzip2 compressed source tarball Source release fb7147a15359a941e0b048c641fd7123 13.3 MB SIG
Mac OS X 32-bit i386/PPC installer macOS for Mac OS X 10.5 and later ec10c5be176faeda17382d3ce6739f32 18.7 MB SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later b208b962515d49c7e236f6dce565a723 18.8 MB SIG
Windows help file Windows ef3058449389c4b77385e6637a911d87 6.3 MB SIG
Windows debug information files Windows f563b701466bbfddc9e228d6cd894647 25.5 MB SIG
Windows x86 MSI installer Windows 8c78e017ba32aafb00f6574c38d0101f 19.3 MB SIG
Windows x86-64 MSI installer Windows for AMD64/EM64T/x64 69ad9e442d33e8c2470b2b6c7575d6dd 19.8 MB SIG