Mailman 3 February 2012 - Python-Dev

Windows build - fixing compile warnings before VS2010
by Brian Curtin Feb. 23, 2012

Feb. 23, 2012

While some effort has gone on to get the 32-bit build to compile without warnings (thanks for that!), 64-bit still has numerous warnings. Before I push forward on more of the VS2010 port, I'd like to have a clean 2008 build all around so we can more easily track what may have changed. In completing that effort, I'm using a guideline Martin set out in #9566 [0], and please let me know if there are any others to follow. I kind of doubt anyone is against this, but if you are, please speak up … [View More]

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http://pythonmentors.com/
by Mark Lawrence Feb. 23, 2012

Feb. 23, 2012

Hi all, I'd never heard of this until some Dutch geezer whose name I'm now forgotten pointed me to it. Had I known about it a couple of years ago it would have saved a lot of people a lot of grief. Please could it be given a bit of publicity. -- Cheers. Mark Lawrence. p.s. The Dutch geezer in question competes with Dr. Who for having the bast time travelling machine :)

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hash randomization in 3.3
by Antoine Pitrou Feb. 23, 2012

Feb. 23, 2012

Hello, Shouldn't it be enabled by default in 3.3? It's currently disabled. $ ./python -c "print(hash('aa'))" 12416074593111936 [44297 refs] $ ./python -c "print(hash('aa'))" 12416074593111936 [44297 refs] Thanks Antoine.

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Re: [Python-Dev] cpython (2.6): - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
by Antoine Pitrou Feb. 22, 2012

Feb. 22, 2012

On Tue, 21 Feb 2012 02:44:32 +0100 barry.warsaw <python-checkins(a)python.org> wrote: > + This is intended to provide protection against a denial-of-service caused by > + carefully-chosen inputs that exploit the worst case performance of a dict > + insertion, O(n^2) complexity. See > + http://www.ocert.org/advisories/ocert-2011-003.html for details. The worst case performance of a dict insertion is O(n) (not counting potential resizes, whose cost is amortized by the … [View More]

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The ultimate question of life, the universe, and everything
by martin＠v.loewis.de Feb. 22, 2012

Feb. 22, 2012

What is the hash of "ePjNTUhitHkL"? Regards, Martin P.S. It took me roughly 86h to compute 150 strings colliding for the 64-bit hash function.

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Re: [Python-Dev] cpython: Optimize str%arg for number formats: %i, %d, %u, %x, %p
by Antoine Pitrou Feb. 22, 2012

Feb. 22, 2012

On Wed, 22 Feb 2012 13:58:45 +0100 victor.stinner <python-checkins(a)python.org> wrote: > > +/* Copy a ASCII or latin1 char* string into a Python Unicode string. > + Return the length of the input string. > + > + WARNING: Don't copy the terminating null character and don't check the > + maximum character (may write a latin1 character in an ASCII string). */ If this is a description of what the function does, it should say "doesn't", not "don't". Right now this … [View More]

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accept string in a2b and base64?
by R. David Murray Feb. 22, 2012

Feb. 22, 2012

Two patches have been committed to 3.3 that I am very uncomfortable with. See issue 13637 and issue 13641, respectively. It seems to me that part of the point of the byte/string split (and the lack of automatic coercion) is to make the programmer be explicit about converting between unicode and bytes. Having these functions, which convert between binary formats (ASCII-only representations of binary data and back) accept unicode strings is reintroducing automatic coercions, and I think it will … [View More]

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CPU vs Wall time Profiling
by Sümer Cip Feb. 22, 2012

Feb. 22, 2012

Hi all, Is there a reason behind the fact that the Python profilers work with Wall time by default? There are OS-dependent ways to get the CPU time of a thread, and giving that choice to the user _somehow_ ( to use wall vs cpu time) might be a good feature? -- Sumer Cip

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Status of PEP 397 - Python launcher for Windows
by Mark Hammond Feb. 21, 2012

Feb. 21, 2012

I'm wondering what thoughts are on PEP 397, the Python launcher for Windows. I've been using the implementation for a number of months now and I find it incredibly useful. To my mind, the specific steps would be: * Have someone pronounce it as accepted (or suggest steps to be taken before such a pronouncement). I can't recall the current process - does Guido have to pronounce personally or formally delegate to a czar? * Move the source into the Python tree and update the build process. … [View More]

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Re: [Python-Dev] [Python-checkins] cpython: enable hash randomization by default
by Nick Coghlan Feb. 21, 2012

Feb. 21, 2012

On Wed, Feb 22, 2012 at 7:08 AM, benjamin.peterson <python-checkins(a)python.org> wrote: > + Changing hash values affects the order in which keys are retrieved from a > + dict. Although Python has never made guarantees about this ordering (and > + it typically varies between 32-bit and 64-bit builds), enough real-world > + code implicitly relies on this non-guaranteed behavior that the > + … [View More]

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