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Python 3.4.0rc3

Release Date: March 10, 2014

Python 3.4.0 release candidate 3 was released on March 9th, 2014. This is a preview release of the next major release of Python, Python 3.4, and is not suitable for production environments.

Major new features of the 3.4 series, compared to 3.3

Python 3.4 includes a range of improvements of the 3.x series, including hundreds of small improvements and bug fixes. Among the new major new features and changes in the 3.4 release series are

  • PEP 428, a "pathlib" module providing object-oriented filesystem paths
  • PEP 435, a standardized "enum" module
  • PEP 436, a build enhancement that will help generate introspection information for builtins
  • PEP 442, improved semantics for object finalization
  • PEP 443, adding single-dispatch generic functions to the standard library
  • PEP 445, a new C API for implementing custom memory allocators
  • PEP 446, changing file descriptors to not be inherited by default in subprocesses
  • PEP 450, a new "statistics" module
  • PEP 451, standardizing module metadata for Python's module import system
  • PEP 453, a bundled installer for the pip package manager
  • PEP 454, a new "tracemalloc" module for tracing Python memory allocations
  • PEP 456, a new hash algorithm for Python strings and binary data
  • PEP 3154, a new and improved protocol for pickled objects
  • PEP 3156, a new "asyncio" module, a new framework for asynchronous I/O

More resources


This is a preview release, and its use is not recommended in production settings.

Please proceed to the download page for the download.

Notes on this release:

  • The final release is scheduled for a week after this release, and it is anticipated that there will be few (if any) changes to Python 3.4.0 between this release and the final release.
  • The binaries for AMD64 will also work on processors that implement the Intel 64 architecture. (Also known as the "x64" architecture, and formerly known as both "EM64T" and "x86-64".) They will not work on Intel Itanium Processors (formerly "IA-64").
  • There is important information about IDLE, Tkinter, and Tcl/Tk on Mac OS X here.


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 15f30d9d906eea3c5f2b1893769a20ca 19188599 SIG
XZ compressed source tarball Source release d356945d284d254990a6e962bbba60bb 14039828 SIG
Mac OS X 32-bit i386/PPC installer Mac OS X for Mac OS X 10.5 and later 0a32943ced5042e5da117b7254a36b1e 22733674 SIG
Mac OS X 64-bit/32-bit installer Mac OS X for Mac OS X 10.6 and later 8cf7b9ab15807e89a4847891af9562da 22819322 SIG
Windows debug information files Windows 3b020ee7c1c51e58119d473370af35fd 36687020 SIG
Windows debug information files for 64-bit binaries Windows 8bc0db6d20c2ee41b7beff5fcb46052f 24112834 SIG
Windows help file Windows c5c823a4492b6f83f3b8cbedb10b589e 7226435 SIG
Windows x86-64 MSI installer Windows for AMD64/EM64T/x64, not Itanium processors 25ab911732a009d31015763a0c722520 25161728 SIG
Windows x86 MSI installer Windows 7791b30f69744ea7ff3166f6daf8f7cb 24461312 SIG