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Python 3.3.3

Release Date: Nov. 17, 2013

fixes several security issues and various other bugs found in Python 3.3.2.

This release fully supports OS X 10.9 Mavericks. In particular, this release fixes an issue that could cause previous versions of Python to crash when typing in interactive mode on OS X 10.9.

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:

831d59212568dc12c95df222865d3441  16808057  Python-3.3.3.tgz
f3ebe34d4d8695bf889279b54673e10c  14122529  Python-3.3.3.tar.bz2
4ca001c5586eb0744e3174bc75c6fba8  12057744  Python-3.3.3.tar.xz
60f44c22bbd00fbf3f63d98ef761295b  19876666  python-3.3.3-macosx10.5.dmg
3f7b6c1dc58d7e0b5282f3b7a2e00ef7  19956580  python-3.3.3-macosx10.6.dmg
3fc2925746372ab8401dfabce278d418  27034152
8af44d33ea3a1528fc56b3a362924500  22145398
8de52d1e2e4bbb3419b7f40bdf48e855  21086208  python-3.3.3.amd64.msi
ab6a031aeca66507e4c8697ff93a0007  20537344  python-3.3.3.msi
c86d6d68ca1a1de7395601a4918314f9   6651185  python333.chm
[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 a44bec5d1391b1af654cf15e25c282f2 65.9 MB SIG
XZ compressed source tarball Source release 4ca001c5586eb0744e3174bc75c6fba8 11.5 MB SIG
bzip2 compressed source tarball Source release f3ebe34d4d8695bf889279b54673e10c 13.5 MB SIG
Mac OS X 32-bit i386/PPC installer macOS for Mac OS X 10.5 and later 60f44c22bbd00fbf3f63d98ef761295b 19.0 MB SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 3f7b6c1dc58d7e0b5282f3b7a2e00ef7 19.0 MB SIG
Windows help file Windows c86d6d68ca1a1de7395601a4918314f9 6.3 MB SIG
Windows debug information files Windows 3fc2925746372ab8401dfabce278d418 25.8 MB SIG
Windows x86 MSI installer Windows ab6a031aeca66507e4c8697ff93a0007 19.6 MB SIG
Windows x86-64 MSI installer Windows for AMD64/EM64T/x64 8de52d1e2e4bbb3419b7f40bdf48e855 20.1 MB SIG