http://blog.gmane.org/gmane.comp.python.general hourly 1 1901-01-01T00:00+00:00 http://gmane.org/img/gmane-25t.png http://gmane.org http://comments.gmane.org/gmane.comp.python.general/732992 <pre> CALL FOR PAPERS: 6th International Workshop on Multi/many-Core Computing Systems (MuCoCoS-2013) September 7, 2013, Edinburgh, Scotland, UK in conjunction with the 22nd Int. Conference on Parallel Architectures and Compilation Techniques (PACT-2013) http://www.ida.liu.se/conferences/mucocos2013 AIMS AND SCOPE The pervasiveness of homogeneous and heterogeneous multi-core and many-core processors, in a large spectrum of systems from embedded and general-purpose to high-end computing systems, poses major challenges to software industry. In general, there is no guarantee that software developed for a particular architecture will be executable (that is functional) on another architecture. Furthermore, ensuring that the software preserves some aspects of performance behavior (such as temporal or energy efficiency) across different such architectures is an open research issue. Therefore, this workshop focuses on language level, system software and architectural solutions for performance portability across different architectures and for automated performance tuning. The topics of the MuCoCoS workshop include but are not limited to: * Performance measurement, modeling, analysis and tuning * Portable programming models, languages and compilation techniques * Run-time systems and hardware support mechanisms for auto-tuning * Tunable algorithms and data structures * Case studies highlighting performance portability and tuning. As the sixth workshop in the series MuCoCoS 2008 (Barcelona, Spain), MuCoCoS 2009 (Fukuoka, Japan), MuCoCoS 2010 (Krakow, Poland), MuCoCoS 2011 (Seoul, Korea), and MuCoCoS 2012 (Salt Lake City, USA), MuCoCoS 2013 will be held in Edinburgh, UK, in conjunction with the 22nd International Conference on Parallel Architectures and Compilation Techniques (PACT 2013). SUBMISSION GUIDELINES The papers should be prepared using the IEEE format (two-column, 10pt, LaTeX users please use style IEEEtran.cls), and no longer than 10 pages. Submitted papers will be carefully evaluated based on originality, significance to workshop topics, technical soundness, and presentation quality. Please submit your paper (as PDF, viewable by Adobe Reader v5.0 or higher, with all fonts embedded please) electronically using the online submission system https://www.easychair.org/conferences/?conf=mucocos2013 Submission of the paper implies that, should the paper be accepted, at least one of the authors will register and present the paper at the workshop. Accepted papers will be published in electronic form in IEEE Xplore (confirmation pending). They will also be included in the PACT USB proceedings. We also plan to invite authors of the best MuCoCoS papers after the workshop to submit their extended workshop papers to a special issue of Computing Journal (Springer) (confirmation pending). IMPORTANT DATES Submission: May 27, 2013 (Firm Deadline) Notification: June 23, 2013 Camera-ready: July 7, 2013 Workshop: September 7, 2013 WORKSHOP ORGANIZATION Christoph Kessler, Linköping University, Sweden, program chair Sabri Pllana, Linnaeus University, Sweden, co-chair PROGRAM COMMITTEE Marco Aldinucci, Univ. of Torino, Italy Beverly Bachmayer, Intel, Germany David Bader, Georgia Tech, USA Jacob Barhen, Oak Ridge National Lab, USA Siegfried Benkner, Univ. of Vienna, Austria Franz Franchetti, Carnegie Mellon University, USA Grigori Fursin, INRIA, France Jörg Keller, FernUniv. Hagen, Germany Lasse Natvig, NTNU Trondheim, Norway Mitsuhisa Sato, Univ. of Tsukuba, Japan Samuel Thibault, INRIA / Univ. of Bordeaux, France Philippas Tsigas, Chalmers University, Sweden Jakub Yaghob, Charles University Prague, Czech Republic </pre> SP 2013-05-20T07:08:55 http://comments.gmane.org/gmane.comp.python.general/732991 <pre>Hi all I am trying to emulate a SQL check constraint in Python. Quoting from the PostgreSQL docs, "A check constraint is the most generic constraint type. It allows you to specify that the value in a certain column must satisfy a Boolean (truth-value) expression." The problem is that I want to store the constraint as a string, and I was hoping to use ast.literal_eval to evaluate it, but it does not work. &gt;&gt;&gt; x = 'abc' &gt;&gt;&gt; x in ('abc', xyz') True &gt;&gt;&gt; b = "x in ('abc', 'xyz')" &gt;&gt;&gt; eval(b) True &gt;&gt;&gt; from ast import literal_eval &gt;&gt;&gt; literal_eval(b) ValueError: malformed node or string: &lt;_ast.Compare object at ...&gt; Is there a safe way to do what I want? I am using python 3.3. Thanks Frank Millman </pre> Frank Millman 2013-05-20T07:05:48 http://comments.gmane.org/gmane.comp.python.general/732983 <pre>hi, How to run a python script twice randomly in a day? Actually I want to run my script randomly in a day and twice only. Please help me.. how is it possible. Thanks </pre> Avnesh Shakya 2013-05-20T03:54:11 http://comments.gmane.org/gmane.comp.python.general/732959 <pre>Hi all, I'm trying to come up with more project ideas for intermediate learners, somewhat along the lines of http://bit.ly/intermediate-python-projects . So here's a question for people who remember coming up from beginner: as you moved from exercises like those in Learn Python the Hard Way, up to your own self-guided work on small projects, what project were you working on that made you feel independent and skilled? What program first felt like your own work rather than an exercise the teacher had assigned? I don't want anything too large, but big enough that there's room for design, and multiple approaches, etc. Thanks in advance! --Ned. </pre> Ned Batchelder 2013-05-19T11:30:49 http://comments.gmane.org/gmane.comp.python.general/732958 <pre>Hi, I have a task to calculate total distortion of a harmonics, of a signal that i imported from oscilloscope as numpy array. I had no problem drawing its spectrum, and time domain graph, but cant seem to find any functions that calculate TDH. Any help? Best regards </pre> Anti Log 2013-05-19T10:52:27 http://comments.gmane.org/gmane.comp.python.general/732941 <pre>TL;DR: I think I want to modify an int value "in place". Yesterday I was thinking about various "flag set" objects I have floating around which are essentially bare "object"s whose attributes I access, for example: flags = object() flags.this = True flags.that = False and then elsewhere: if flags.that: do that ... Nice and readable, but I thought to myself: so bulky! The use case for flags is essentially boolean/binary, and so a int accessed as a bitmask should be smaller. So I pulled out my BitMask int subclass (which mostly transcribes the int as "A|B|C" for readability purposes, partly to dillute Nick Coglan's liking for bulky strings over compact ints on readability grounds:-), and gave the subclass attribute access. This works just fine for querying the flags object, with code exactly like the "if" statement above. But setting up a flags object? What I _want_ to write is code like this: Flags = BitMask('this', 'that') # set default state flags = Flags() flags.this = False flags.that = True ... iterate over some options ...: flags.this = True and there's my problem. This would modify the int in place. There's no way to do that. For the base type (int) this makes perfect sense, as they're immutable. Before I toss this approach and retreat to my former "object" technique, does anyone see a way forward to modify an int subclass instance in place? (That doesn't break math, preferably; I don't do arithmetic with these things but they are, after all, ints...) Cheers, </pre> Cameron Simpson 2013-05-19T00:26:29 http://comments.gmane.org/gmane.comp.python.general/732923 <pre>I'm getting the error in the subject, from the following code: def add(self, key): """ Adds a node containing I{key} to the subtree rooted at I{self}, returning the added node. """ node = self.find(key) if not node: node.key = key # placeholder node.left, node.right = self.__class__(parent=node), self.__class__(parent=node) return (False, node) else: if random.random() &lt; 0.5: print('node.left is %s' % node.left) return BinaryTree.add(self=node.left, key=key) else: print('node.right is %s' % node.left) return BinaryTree.add(self=node.right, key=key) The above add() method is part of a BinaryTree(object) class, whose subclass is RedBlackTree. We need to explicitly call BinaryTree.add() with an explict self, to avoid inappropriately calling RedBlackTree.add().; BinaryTree.add() is being called with a RedBlackTree instance as self. The debugging print and traceback look like: node.left is 0 -1 red Traceback (most recent call last): File "app_main.py", line 51, in run_toplevel File "test-red_black_tree_mod", line 328, in &lt;module&gt; test() File "test-red_black_tree_mod", line 316, in test all_good &amp;= test_duplicates() File "test-red_black_tree_mod", line 194, in test_duplicates tree.add(value) File "/home/dstromberg/src/home-svn/red-black-tree-mod/trunk/duncan/red_black_bag_mod.py", line 919, in add (replaced, node) = super(RedBlackTree, self).add(key=key) File "/home/dstromberg/src/home-svn/red-black-tree-mod/trunk/duncan/red_black_bag_mod.py", line 376, in add return BinaryTree.add(self=node.left, key=key) TypeError: unbound method add() must be called with BinaryTree instance as first argument (got nothing instead) Why is it complaining that .add() is getting nothing, when node.left isn't None? As you can see above the traceback, it's got a value represented by "node.left is 0 -1 red". python 2.x, python 3.x and pypy all give this same error, though jython errors out at a different point in the same method. Thanks! </pre> Dan Stromberg 2013-05-18T19:01:12 http://comments.gmane.org/gmane.comp.python.general/732921 <pre>Hello! I'm pleased to announce version 1.4.0, the first stable release of branch 1.4 of SQLObject. What's new in SQLObject ======================= Features &amp; Interface -------------------- * Support for PostgreSQL 8.1 is dropped. The minimal supported version of PostgreSQL is 8.2 now. * Optimization in PostgresConnection: use INSERT...RETURNING id to get the autoincremented id in one query instead of two (INSERT + SELECT id). * Changed the way to get if the table has identity in MS SQL. * NCHAR/NVARCHAR and N''-quoted strings for MS SQL. Contributors for this release are Ken Lalonde and Andrew Ziem. For a more complete list, please see the news: http://sqlobject.org/News.html What is SQLObject ================= SQLObject is an object-relational mapper. Your database tables are described as classes, and rows are instances of those classes. SQLObject is meant to be easy to use and quick to get started with. SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite, Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB). Where is SQLObject ================== Site: http://sqlobject.org Development: http://sqlobject.org/devel/ Mailing list: https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss Archives: http://news.gmane.org/gmane.comp.python.sqlobject Download: https://pypi.python.org/pypi/SQLObject/1.4.0 News and changes: http://sqlobject.org/News.html Oleg. </pre> Oleg Broytman 2013-05-18T10:08:30 http://comments.gmane.org/gmane.comp.python.general/732912 <pre>Not sure if this is the right place to talk about this. Even less sure if I can move this discussion to tkinter list, so here I am... I know this may sound a silly question because no one can see the future. But ... Do you think tkinter is going to be the standard python built-in gui solution as long as python exists? I couldn't help but wonder if wx or PySide receives better py2 and py3 support, or anything else that prevent them from getting into the standard python distributions, whether or not this scene could start to shift ... I believe this "which one of tkinter, wx, qt, is the best gui toolkit for python" flame war has been going on for ages. I love the fact that python ships a built-in gui solution which makes shipping a pure-python desktop application a viable choice. But tkinter does not appear to be the most time-saving way to write a gui app. The layout designer support, for one, is next to zero. I tried many 3rd-party designers and loved PAGE (http://page.sourceforge.net) for a few minutes, then came the author's comment: "For release 4.0, I spent about two months working with the “Theme” part of Ttk and have had only partial success. I now believe that the “Theme” part of Ttk is really a very poor piece of software at all levels - concept, implementation, and especially documentation. My guess is if it had been well documented it would have been recognized by even the author as junk. I find it hard to believe that the people who control Tcl/Tk allowed it in the code base. I continue to support ttk because of the paned window, notebook and treeview widgets." And ttk seems to be a major attraction that keeps people coming back to tk for the looks. This worries me very much about whether I should start a gui app using python. Because if ttk is not a "mature" technology, I'd avoid premature adoption. If ttk is out of the question, tkinter will be too. I'd then be forced to use a 3rd-party solution like wx or qt, which I really don't want to see. Anyways, this is just some concerns that I hope someone may give his/her opinions about. Thanks! </pre> Beinan Li 2013-05-18T14:03:02 http://comments.gmane.org/gmane.comp.python.general/732901 <pre>hi, i want to run python script which generating data into json fromat, I am using crontab, but it's not executing... my python code-- try.py -- import json import simplejson as json import sys def tryJson(): saved = sys.stdout correctFile = file('data.json', 'a+') sys.stdout = correctFile result = [] i = 1 for i in range(5): info = { 'a': i+1, 'b': i+2, 'c': i+3, } result.append(info) if result: print json.dumps(result, indent=6) sys.stdout = saved correctFile.close() tryJson() now i m doing ion terminal- avin&lt; at &gt;hp:~$ crontab -e then type - */2 * * * * python /home/avin/data/try.py and save but it's not executing. </pre> Avnesh Shakya 2013-05-18T10:12:30 http://comments.gmane.org/gmane.comp.python.general/732899 <pre>This is my first script where I want to use the python threading module. I have a large dataset which is a list of dict this can be as much as 200 dictionaries in the list. The final goal is a histogram for each dict 16 histograms on a page ( 4x4 ) - this already works. What I currently do is a create a nested list [ [ {} ], [ {} ] ] each inner list contains 16 dictionaries, thus each inner list is a single page of 16 histograms. Iterating over the outer-list and creating the graphs takes to long. So I would like multiple inner-list to be processes simultaneously and creating the graphs in "parallel". I am trying to use the python threading for this. I create 4 threads loop over the outer-list and send a inner-list to the thread. This seems to work if my nested lists only contains 2 elements - thus less elements than threads. Currently the scripts runs and then seems to get hung up. I monitor the resource on my mac and python starts off good using 80% and when the 4-thread is created the CPU usages drops to 0%. My thread creating is based on the following : http://www.tutorialspoint.com/python/python_multithreading.htm Any help would be create!!! </pre> Jurgens de Bruin 2013-05-18T08:58:13 http://comments.gmane.org/gmane.comp.python.general/732893 <pre>hi, I want to run a another file inside a ached.add_cron_job(..). how is it possible, please help me, I have a file otherFile.py for execution inside current file. I know it is very easy question but i m unable to get anything, please help me. example -- import otherFile from apscheduler.scheduler import Scheduler sched = Scheduler() sched.start() def job_function(): # Can I here add that file for execution, Or can i add that file directly inside cron? sched.add_cron_job(job_function, month='1-12', day='1-31', hour='0-23',minute='44-49') </pre> Avnesh Shakya 2013-05-18T04:48:54 http://comments.gmane.org/gmane.comp.python.general/732891 <pre>Confusing subject for a confusing problem (to a novice like me of course!) Thx for the help in advance folks I have (2) dictionaries: prices = { "banana": 4, "apple": 2, "orange": 1.5, "pear": 3 } stock = { "banana": 6, "apple": 0, "orange": 32, "pear": 15 } Here's my instructions: consider this as an inventory and calculate the sum (thats 4*6 = 24 bananas!) HERES MY CODE: for key in prices: print prices[key]*stock[key] HERES THE OUTPUT: 48.0 45 24 0 ISSUE: I need to find a way to add all of those together...any pointers? </pre> Bradley Wright 2013-05-18T04:19:54 http://comments.gmane.org/gmane.comp.python.general/732888 <pre>Defend Against Fruit is focused on providing a pragmatic, continuous deployment style build system for Python. Current Python build systems do not properly account for the needs of effective continuous deployment. This package extends the Python tooling to add the missing pieces, including integration with Artifactory. With an eye to agile development principles and fast-feedback, we want a build system which satisfies the following goals: * Every SCM change-set committed should result in a potentially shippable release candidate. * When a defect is introduced, we want to immediately detect and isolate the offending SCM change-set. This is true even if the defect was introduced into a library we depend upon. * Library management should be so easy as to never impede code changes, even in multi-component architecture. More details available at: http://teamfruit.github.io/defend_against_fruit/ License: Apache Public License v2 Authors: James Carpenter jcarpenter621 at yahoo.com LinkedIn: http://www.linkedin.com/in/jamescarpenter1 Matthew Tardiff mattrix at gmail.com LinkedIn: http://www.linkedin.com/in/matthewtardiff </pre> James Carpenter 2013-05-17T19:25:10 http://comments.gmane.org/gmane.comp.python.general/732885 <pre>I am seeking part/full time work as a back-end Python developer (telecommute or Utah only). I have been maintaining a Debian/Python/Django/Apache/PostgreSQL/PHP/MySql web application for 3 years on my own. I do all the development, database and system management myself. I can setup a complete system from scratch remotely or setup the hosting service. I have experience with Virtualbox and ProxMox virtualization. I have expereince in all areas of IT including telecom, programming, networking, hardware and software. Worked with Retail stores, warehousing systems, accounting software, data interchange, hardware interfacing, etc. Regards, Rob </pre> Rob Sutton 2013-05-17T18:36:07 http://comments.gmane.org/gmane.comp.python.general/732872 <pre>One feature that seems to be missing in the re module (or any tools that I know for searching text) is "diacretical incensitive search". I would like to have a match for something like this: re.match("franc", "français") in about the same whay we can have a case incensitive search: re.match("(?i)fran", "Français"). Another related and more general problem (in the sense that it could easily be used to solve the first problem) would be to translate a string removing any diacritical mark: nodiac("Français") -&gt; "Francais" The algorithm to write such a function is trivial but there are a lot of mark we can put on a letter. It would be necessary to have the list of "a"'s with something on it. i.e. "à,á,ã", etc. and this for every letter. Trying to make such a list by hand would inevitably lead to some symbols forgotten (and would be tedious). Olive </pre> Olive 2013-05-17T06:57:04 http://comments.gmane.org/gmane.comp.python.general/732866 <pre> I need to write numbers into a file upto 50mb and it should be fast can any one help me how to do that? i had written the following code.. ----------------------------------------------------------------------------------------------------------- def create_file_numbers_old(filename, size): start = time.clock() value = 0 with open(filename, "w") as f: while f.tell()&lt; size: f.write("{0}\n".format(value)) value += 1 end = time.clock() print "time taken to write a file of size", size, " is ", (end -start), "seconds \n" ------------------------------------------------------------------------------------------------------------------ it takes about 20sec i need 5 to 10 times less than that. </pre> lokeshkoppaka< at >gmail.com 2013-05-17T03:20:26 http://comments.gmane.org/gmane.comp.python.general/732857 <pre>Hello Python developers I want to know how relative imports are different than import. I have found lots of examples on internet explaining about the relative import but I want to know about the basic aspects of relative import that make it different than import. *Regards * *Chitrank Dixit * *IIPS-DAVV * *Indore (M.P.) , India * *MCA * *trackleech.blogspot.in* </pre> Chitrank Dixit 2013-05-16T20:05:49 http://comments.gmane.org/gmane.comp.python.general/732846 <pre>I'm using the csv module to get information from a csv file. I have items listed in Column A. I want to know how many items are listed in Column A. import csv with open('test.csv', 'r') as f: reader = csv.reader(f) for column in reader: column = (column[0]) print(column) We are given How would I go about getting the amount of numbers that are printed? If I try printing len(column), I get </pre> tunacubes< at >gmail.com 2013-05-16T18:29:25 http://comments.gmane.org/gmane.comp.python.general/732845 <pre>anyone? </pre> visphatesjava< at >gmail.com 2013-05-16T18:17:37 http://comments.gmane.org/gmane.comp.python.general/732844 <pre>how? and what package provides such? </pre> visphatesjava< at >gmail.com 2013-05-16T18:14:44 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.python.general