🌐 Mailman 3 March 2010 - Python-list - python.org

Call for Participation: CHR Summer School
by Jon Sneyers March 1, 2010

March 1, 2010

- Call for Participation - First International Summer School on CHR: Programming and Reasoning with Rules and Constraints August 30 - September 3 2010 Leuven, Belgium Website: http://www.cs.kuleuven.be/~dtai/CHR/summerschool **************************************************************************** * EARLY REGISTRATION DISCOUNT: When registering (including payment) before * * March 31, the registration fee will be reduced by 20 euro! * * * * Additional early registration incentive: * * The first 7 registrants get a FREE copy of the book * * "Constraint Handling Rules - Current Research Topics" * **************************************************************************** The aim of the summer school is to familiarize the participants with state-of-the-art high-level declarative programming with rules and constraints as well as providing insights into the analysis of programs based on these concepts. The courses cover a wide range from theory to practice. The summer school will be based on the advanced high-level rule-based formalism and programming language Constraint Handling Rules (CHR) http://constraint-handling-rules.org/ Intended Audience: The summer school provides courses at various levels. It is open to anyone interested. It aims at Phd. students, but also post-docs, interested researchers and master students as well as interested parties from industry. Besides a working knowledge of English, there are no prerequisites. A basic knowledge of logic and Prolog that is usually covered in undergraduate classes could be helpful. Lectures and Courses: The programming language CHR will be introduced by several lecturers on the first day of the summer school. - Slim Abdennadher, GUC, Egypt Analysis of CHR Solvers - Henning Christiansen, U. Roskilde, Denmark Abduction and language processing with CHR - Thom Fruehwirth, University Ulm, Germany CHR - a common platform for rule-based approaches - Jon Sneyers, K.U.Leuven, Belgium Computability and Complexity of CHR - Peter Van Weert, K.U.Leuven, Belgium Implementation of CHR Systems A final evaluation for each course is possible through a final exam or project as determined by the instructor. The daily schedule admits laboratory, recitation or working group activities to be organized in addition to lectures. Registration: The registration fee for the School is 300 euro and includes teaching material with book, as well as accomodation and coffee breaks. Meals are not included. Attendance is limited to 20 students and will be allocated on a first-come- first-served basis. Without accommodation the registration fee is reduced to 200 euro. Location: Leuven is a lively student town in Belgium with a very high density of pubs offering hundreds of types of local beers. Organization: Thom Fruehwirth, University of Ulm, Germany Jon Sneyers, K.U. Leuven, Belgium Peter Van Weert, K.U. Leuven, Belgium -- Looking for an H-912 (container).

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Class attributes / methods..... full Python script
by Gabor Urban March 1, 2010

March 1, 2010

Hi guys, thanks for the ideas. Here you are the code. Not transcoded from Java for I do not know Java enough.. I am scanning an XML file, and have a large ammount of logging. Any ideas are wellcome as before.... Thnx Code:> #--------------------------------------------- ## Generate CSV from OEP History XML #--------------------------------------------- import sys import os from xml.dom.minidom import parse, parseString import xml.dom import logging versionStr = '0.01' class Item: def __init__(self, pId, pChange, pComment): self.ID = pId self.Delta = pChange self.Comment = pComment def PrintItem(self): str = '%s,%s,%s'%(self.ID,self.Delta,self.comment) return str class Package: def __init__(self, pSerial, pDate, pOwner, pSchema): self.serial = pSerial self.date = pDate self.owner = pOwner self.schema = pSchema self.items = [] def insertItem(self, pItem): self.items.append(pItem) def printPackage(self): lines = [] str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema) number = self.items.length for idx in xrange(number): line = '' istr = self.items[idx].PrintItem() line = str + ',' + istr lines.append(line) return lines def getItem(tracer, pkgItem, itemName): retval = -1 name = "" found = 0 str = "" tracer.info('Function getItem entry, name = %s',itemName) nItem = pkgItem.getElementsByTagName(itemName).item(0) for node in pkgItem.childNodes: if node.nodeType != xml.dom.Node.TEXT_NODE: tracer.debug('Scanning node name = %s',node.nodeName) if node.nodeName == itemName: tracer.debug('Pkg %s found',itemName) else: tracer.warning('Pkg %s is not found',itemName) continue for entity in node.childNodes: if entity.nodeType == xml.dom.Node.TEXT_NODE: retval = entity.nodeValue tracer.debug("Node value found %s",retval) found = 1 break if found == 1: break tracer.debug('Function getItem returns %s',retval) return retval logger = logging.getLogger('XmlHistory') handler = logging.FileHandler("Xmlhistory.trc",'a') ## handler = logging.StreamHandler(sys.stderr) logger.addHandler(handler) formatter = logging.Formatter("%(name)s %(asctime)s %(filename)s %(lineno)d %(levelname)s %(message)s") handler.setFormatter(formatter) logger.setLevel(2) fileName = "history.xml" output = 'history.csv' logger.info('Xml history generator version %s',versionStr) logger.info('Starting history generation on file:%s',fileName) packages = [] data = [] ## Start XML processing dataSource = parse(fileName) print dataSource.documentElement.tagName listCsomag = dataSource.getElementsByTagName("csomag") size = listCsomag.length logger.debug('Number of packages = %d',size) for idx in xrange(size): attrib = "" package = None serial = 0 date = "" owner = "" schema = "" flag = False logger.info('Parsing package id=%d',idx) attrib = getItem(logger, listCsomag.item(idx),'sorszam') if attrib <> "NUM" and attrib <> -1: serial = int(attrib) flag = True logger.debug('Package serial set to %d',serial) else: logger.debug("Template package found.") break attrib = "" attrib = getItem(logger,listCsomag.item(idx),"datum") if attrib <> -1: date = attrib flag = flag and True logger.debug('Package date set to %s',date) attrib = "" attrib = getItem(logger,listCsomag.item(idx),"ki") if attrib <> -1: owner = attrib flag = flag and True logger.debug('Package owner set to %s',owner) attrib = "" attrib = getItem(logger,listCsomag.item(idx),"sema") if attrib <> -1: schema = attrib flag = flag and True logger.debug('Package schema set to %s',schema) if flag <> True: logger.error('Package id=%d is inconsistent',idx) break else: logger.info('Package id=%d is ok',idx) package = Package(serial,date,owner,schema) listItem = listCsomag.item(idx).getElementsByTagName("item") itemSize = listItem.length logger.debug('Number of items = %d',itemSize) for num in xrange(itemSize): flag = False value = -1 listId = 0 change = "" comment = "" item = None logger.info('Parsing item id = %d',num) value = getItem(logger,listItem.item(num),"item_id") if value <> -1: listId = int(value) flag = True logger.debug('List id set to %d',listId) value = "" value = getItem(logger,listItem.item(num),"valtozas") if value <> -1: change = value flag = flag and True logger.debug('List change desc. set to "%s"',change) value = "" value = getItem(logger,listItem.item(num),"komment") if value <> -1: comment = value flag = flag and True logger.debug('List comment desc. set to "%s"',comment) if flag <> True: logger.error('Item id = %d inconsistent',num) break else: logger.info('Item id = %d is ok',num) item = Item(listId,change,comment) package.insertItem(item) packages.append(Package) logger.info('Processing Xml file %s is done',fileName) logger.info('Generating file %s is started',output) size = len(packages) package = None for index in xrange(size): logger.info('PrettyPrinting package id=%d',index) oplines = [] oplines = packages[index].printPackage() for i in xrange(oplines.length): data.append(oplines[i]) print data -- Linux: Choice of a GNU Generation

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Re: Class attributes / methods..... full Python script
by Peter Otten March 1, 2010

March 1, 2010

Gabor Urban wrote: > thanks for the ideas. Here you are the code. Not transcoded from Java > for I do not know Java enough.. > > I am scanning an XML file, and have a large ammount of logging. > > Any ideas are wellcome as before.... > > Thnx > > Code:> > packages.append(Package) Replace Package (the class) with package (an instance). > for i in xrange(oplines.length): > data.append(oplines[i]) Python lists don't have a length attribute. You can determine their length with len(oplines). To iterate over the items of a list you need not know the list's length: for line in oplines: data.append(line) which can be simplified to data.extend(oplines) Peter PS: Rrread the tutorial

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How to crash CPython 3.1.1 in Windows XP
by Alf P. Steinbach March 1, 2010

March 1, 2010

How to crash CPython 3.1.1 in Windows XP: python -c "import os; os.spawnl( os.P_WAIT, 'blah' )" I reported this as a bug, <url: http://bugs.python.org/issue8036> Workaround: it seems that spawnl is happy with an absolute path as second arg, followed by a third arg which should be the name of the program (repeated). Cheers, - Alf

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Building Python with Scons
by Gerhard Häring March 1, 2010

March 1, 2010

I'm setting up a third-party library project (similar to the one in Google Chromium) where I use SCons as build tool. Now I need to integrate Python, too. Has anybody written a Scons script for Python 2.x or 3.x, yet? -- Gerhard

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Re: Docstrings considered too complicated
by Andreas Waldenburger March 1, 2010

March 1, 2010

On Mon, 01 Mar 2010 11:42:16 -0600 Robert Kern <robert.kern(a)gmail.com> wrote: > On 2010-03-01 11:22 , Andreas Waldenburger wrote: > > > Back in the software world: Those guys write code that works. It > > does what it's supposed to do. Why should we care where they put > > their comments? > > Software usually needs to be maintained and extended over the course > of its lifetime. The original team that wrote it may not be available > in the future. > > Furthermore, docstrings are not comments. They become part of the > function object and can be introspected at runtime. This is a very > important tool when working with code at the interactive prompt and > for the collection of API documentation. Comments are less useful > than docstrings; the OP's complaint was that his programmers were > putting the function documentation in other places than docstrings, > rendering them less useful than they could have been. > No, the OP complained about those guys being idiots. I should know, because I posted it. /W -- INVALID? DE!

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AOP decorator?
by gentlestone March 1, 2010

March 1, 2010

Hi, suppose my source code looks like: -------------------------------- import aspect_xy class Basic(object, aspect_xy.Basic): pass # basic attributes and methods ... -------------------------------- and the source code of aspect_xy.py is: -------------------------------- class Basic(object): pass # aspect extra attributes and methods ... -------------------------------- how can I write this with decorators? I want something like: ------------------------------- import aspect_xy @aspect_xy # extra attributes and methods ... class Basic(object): pass # basic attributes and methods ... ---------------------------------------------------------- I want to write class decorator function, which: 1. Takes the basic class as parameter 2. Find the same class name in aspect_xy.py 3. Inherit the found aspect class Is it possible?

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by coolboy8 March 1, 2010

March 1, 2010

VISIT http://alturl.com/8xs8

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Variable definition
by Raphael Mayoraz March 1, 2010

March 1, 2010

Hello, I'd like to define variables with some specific name that has a common prefix. Something like this: varDic = {'red': 'a', 'green': 'b', 'blue': 'c'} for key, value in varDic.iteritems(): 'myPrefix' + key = value I know this is illegal, but there must be a trick somewhere. Thanks, Raphael

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Re: Draft PEP on RSON configuration file format
by Patrick Maupin March 1, 2010

March 1, 2010

> > Certainly. The PEP format is a useful one. I've used it myself for some numpy > design documents. But can you see why people might get confused about your > intentions when you call it a draft PEP and post it to python-dev? If you stop > calling it a PEP and stop talking about putting it in the standard library, > people will stop being distracted by those issues. As I mentioned, I didn't see the fine print in PEP 1 about PEP 2 being the document for library modules. As I mentioned, mea culpa. It is painfully obvious that some don't like the way I have gone about describing the project. They obviously view me announcing this as premature, or presumptuous, or something, and they have some sort of visceral reaction to that. However, I do not believe that any people (other than me) were really confused in the process. I made my intentions clear, and some people reacted badly to that because I didn't follow the process (for which I apologize again). But calling it a draft PEP is a distraction (because of the visceral reaction), but is not really what I would call confusing. My intention actually is to try to build something that is worthy of the standard library, and to eventually try to get it accepted, because I perceive a hole there, with a lot of point solutions being done to solve a common problem, and I believe the pushback is coming from people who fully understood that intention from my posting. I will try to say "hey -- here's a hole in the library and a proposal for how to fix it" more diplomatically and in the correct forum in the future, but it would be disingenuous for me to disown my goal of getting a better configparser into the standard library. Regards, Pat

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