Mailman 3 March 2010 - Python-Dev

Re: [Python-Dev] Decimal <-> float comparisons in py3k.
by P.J. Eby April 14, 2010

April 14, 2010

At 09:58 AM 3/16/2010 -0500, Facundo Batista wrote: >I'm +0 to allow these comparisons, being "Decimal(1) < .3" the same as >"Decimal(1) < Decimal.from_float(.3)" Does Decimal.from_float() use the "shortest decimal representation" approach? If not, it might be confusing if a number that prints as '.1' compares unequal to Decimal('.1').

9 18

"Fixing" the new GIL
by Antoine Pitrou April 12, 2010

April 12, 2010

Hello, As some of you may know, Dave Beazley recently exhibited a situation where the new GIL shows quite a poor behaviour (the old GIL isn't very good either, but still a little better). This issue is followed in http://bugs.python.org/issue7946 This situation is when an IO-bound thread wants to process a lot of incoming packets, while one (or several) CPU-bound thread is also running. Each time the IO-bound thread releases the GIL, the CPU-bound thread gets it and keeps holding it for at … [View More]

12 39

Re: [Python-Dev] Mixing float and Decimal -- thread reboot
by Greg Ewing April 2, 2010

April 2, 2010

Raymond Hettinger wrote: > Since decimal also allows arbitrary sizes, all long ints can be > exactly represented (this was even one of the design goals > for the decimal module). There may be something we need to clarify here. I've been imagining that the implicit conversions to Decimal that we're talking about would be done to whatever precision is set in the context. Am I wrong about that? Is the intention to always use enough digits to get an exact representation? -- Greg

10 37

Modifying Grammar/grammar and other foul acts
by Gregg Lind April 1, 2010

April 1, 2010

Python-devs, I'm writing to you for some help in understanding the Python grammar. As an excuse to deep dive into Python's tokenizer / grammar, I decided (as a hideous, hideous joke) to want to allow braces where colons are allowed (as flow control). Starting from PEP 306 (and branch r311), I hacked on Grammar/Grammer As a first example: funcdef: ('def' NAME parameters ['->' test] ':' suite | 'def' NAME parameters ['->' test] '{' suite '}' ) I reran Parser/pgen and the dfa … [View More]

7 8

Replacing threads with swapcontext()
by Alexander Sabourenkov April 1, 2010

April 1, 2010

Hello. I have went and replaced Python threads with explicitly-scheduled coroutines using swapcontext() family of functions (basically out of frustration with the greenlet). I have two questions. 1. Is it as dangerous to switch C stacks and not switch PyThreadState as I suspect? In particular, how tightly is PyThreadState::frame coupled to current C stack? 2. How do you all look at merging my work as another threading-related configure switch? It's only another thread_something.h file … [View More]

2 2

Add -3 and -Wd to the buildbots
by Ezio Melotti March 31, 2010

March 31, 2010

Hi, now that the py3k warnings are fixed (see http://bugs.python.org/issue7092) we should run the tests on the trunk buildbots with the -3 flags, in order to check if new warnings are introduced and possibly to uncover other ones. It might be a good idea to add the -Wd flag too, both on trunk and py3k. -Ezio

4 3

GSoC 2010 is on -- projects?
by C. Titus Brown March 31, 2010

March 31, 2010

Hi all, once again, the PSF has been accepted as a mentoring foundation for the Google Summer of Code! This year, we're going to emphasize python 3 porting, so please think of projects you'd like to see tackled. Please submit ideas for projects as soon as possible, as students will be able to start applying soon. You can add them to this page: http://wiki.python.org/moin/SummerOfCode/2010 You can subscribe to the mentors list here, http://mail.python.org/mailman/listinfo/soc2010-… [View More]

9 16

Contribute
by Valerio Turturici March 31, 2010

March 31, 2010

Hello everyone, my name's Valerio, i'm italian and i study computer science at University of Pisa. I'm honored to speak and learn from people like you. My knowledge of C language is not very advanced, but i know Python well enough. I really like to contribute, i can learn and improve a lot. This is the first time that i participate in a serious, large and complex project. Have you any advice for me? :)

8 8

Bootstrap script for package management tool in Python 2.7 (Was: Re: [Distutils] At least one package management tool for 2.7)
by anatoly techtonik March 29, 2010

March 29, 2010

So, there won't be any package management tool shipped with Python 2.7 and users will have to download and install `setuptools` manually as before: "search" -> "download" -> "unzip" -> "cmd" -> "cd" -> "python setup.py install" Therefore I still propose shipping bootstrap package that instruct user how to download and install an actual package management tool when users tries to use it. So far I know only one stable tool - `easy_install` - a part of `setuptools` package. … [View More]

9 19

WeakSet in Python 2.7
by Michael Foord March 29, 2010

March 29, 2010

Hello all, Python 3 includes a WeakSet implementation. Any objections to me backporting this to 2.7? http://docs.python.org/py3k/library/weakref.html#weakref.WeakSet I needed this in unittest and used a WeakKeyDictionary instead. Michael -- http://www.ironpythoninaction.com/ http://www.voidspace.org.uk/blog READ CAREFULLY. By accepting and reading this email you agree, on behalf of your employer, to release me from all obligations and waivers arising from any and all NON-NEGOTIATED … [View More]

3 6