[RELEASED] Python 3.5.0rc4 is now available!

Larry Hastings larry at hastings.org
Wed Sep 9 15:42:02 CEST 2015

On behalf of the Python development community and the Python 3.5 release 
team, I'm surprised to announce the availability of Python 3.5.0rc4, 
also known as Python 3.5.0 Release Candidate 4.

Python 3.5.0 Release Candidate 3 was only released about a day ago.  
However: during testing, a major regression was discovered, reported on 
the issue tracker as #25027:


Python 3.5 includes some big changes on how Python is built on Windows.  
One of those changes resulted in Python processes on Windows exceeding 
the maximum number of loadable shared libraries.  As a result Windows 
builds of Python could no longer run major Python software stacks like 
Pandas and Jupyter. Fixing this required non-trivial last-minute changes 
to the Windows build--and those changes need testing.  We therefore 
elected to insert an extra release candidate before the final release, 
to get these changes into your hands as soon as possible, so that 
Windows users could test these changes.

As with all other Python 3.5 releases to date, this is a preview 
release, and its use is not recommended for production settings.  
However, users are encouraged to test with Python 3.5.0rc4, /especially/ 
Windows users who build or make use of numerous external packages.  
(Non-Windows users will find little difference between Python 3.5.0rc3 
and Python 3.5.0rc4.)

You can find Python 3.5.0rc4 here:


Windows and Mac users: please read the important platform-specific 
"Notes on this release" section near the end of that page.

Please kick the tires,


p.s.  Special thanks from the Python 3.5 release team to Christoph 
Gohlke for the bug report!
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