[ANN] Last day for early bird rate - Python-Workshop in Leipzig, Germany, September 7, 2007
The following announcement is in German. Despite this we would like to post it here, because many German speaking Python users read this group/list. Heute ist der letzte Tag, an dem die ermäßigte Anmeldegebühr gilt. Ab 1. September wird es teurer. Anmelden kann man sich hier: http://www.python-academy.de/workshop/anmeldung.html === Workshop Python im deutschsprachigen Raum === Am 7. September 2007 findet in Leipzig der zweite Workshop Python im deutschsprachigen Raum statt. Der erste Workshop 2006 war erfolgreich, so dass es auch dieses Jahr einen geben wird. Der Workshop ist als Ergänzung zu den internationalen und europäischen Python-Zusammenkünften gedacht. Die Themen- palette der Vorträge ist sehr weit gefasst und kann alles einschließen, was mit Python im deutschsprachigen Raum zu tun hat. Eine ausführliche Beschreibung der Ziele des Workshops, der Workshop-Themen sowie Details zu Organisation und Anmeldung sind unter http://www.python-academy.de/workshop zu finden. === Wichtige Termine === 31.08.2007 Letzter Termin für Frühbucherrabatt 07.09.2007 Workshop 15.09.2007 Letzter Termin für die Einreichung der publikationsfähigen Beiträge Dezember 2007 Veröffentlichung des Tagungsbandes === Bitte weitersagen === Der Workshop soll auch Leute ansprechen, die bisher nicht mit Python arbeiten. Wer mithelfen möchte, den Workshop bekannt zu machen, kann einen Link auf http://www.python-academy.de/workshop setzen. Auch außerhalb des Internets kann der Workshop durch den Flyer http://www.python-academy.de/download/workshop_call_for_papers.pdf oder das Poster http://www.python-academy.de/download/poster_python_workshop_2007.pdf bekannt gemacht werden. Den Flyer einfach doppelseitig ausdrucken oder kopieren. Das Poster möglichst auf A3 ausdrucken oder von A4 auf A3 kopieren. Gern schicken wir auch die gewünschte Menge Flyer oder Poster im A3-Format per Post zu. Dann ein Poster zusammen mit ein paar Flyern am Schwarzen Brett von Universitäten, Firmen, Organisationen usw. aushängen. Ideen, wie wir auch Leute erreichen, die Python-Websites oder -Listen nicht frequentieren, sind immer willkommen. Wir freuen uns auf eine rege Teilnahme, Mike Müller Stefan Schwarzer -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Python 3000 released as 3.0a1
[Bcc: [EMAIL PROTECTED] The first Python 3000 release is out -- Python 3.0a1. Be the first one on your block to download it! http://python.org/download/releases/3.0/ Excerpts: Python 3000 (a.k.a. Py3k, and released as Python 3.0) is a new version of the language that is incompatible with the 2.x line of releases. The language is mostly the same, but many details, especially how built-in objects like dictionaries and strings work, have changed considerably, and a lot of deprecated features have finally been removed. This is an ongoing project; the cleanup isn't expected to be complete until 2008. In particular there are plans to reorganize the standard library namespace. The release plan is to have a series of alpha releases in 2007, beta releases in 2008, and a final release in August 2008. The alpha releases are primarily aimed at developers who want a sneak peek at the new langauge, especially those folks who plan to port their code to Python 3000. The hope is that by the time of the final release, many 3rd party packages will already be available in a 3.0-compatible form. More links: * Online docs: http://docs.python.org/dev/3.0/ * What's new: http://docs.python.org/dev/3.0/whatsnew/3.0.html * Source tar ball: http://python.org/ftp/python/3.0/Python-3.0a1.tgz * Windows MSI installer: http://python.org/ftp/python/3.0/python-3.0a1.msi * PEP 3000: http://python.org/dev/peps/pep-3000/ * Issue tracker: http://bugs.python.org/ * Py3k dev list: http://mail.python.org/mailman/listinfo/python-3000/ * Conversion tool for Python 2.x code: http://svn.python.org/view/sandbox/trunk/2to3/ -- --Guido van Rossum (home page: http://www.python.org/~guido/) -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Wing IDE 3.0 beta2 released
Hi, I'm happy to announce the release of Wing IDE 3.0 beta 2. It is available from http://wingware.com/wingide/beta Changes since the previous beta release include: * Stackless Python 2.4 and 2.5 are now supported * Python 2.5 for 64-bit Windows is now supported * Fixed Zope WingDBG so it will connect back to IDE * Improved auto-completion coverage for imports and end cases * Up to 10% speed-up when running in debugger * Fixed many other bugs, particularly source browser, OS commands, testing tool, and source assistant (*) In addition, we have introduced Wing IDE 101, a free scaled back version of Wing IDE designed for teaching introductory programming courses. The CHANGELOG.txt file in the installation provides additional details. The major new features introduced in Wing 3.0 are: * Multi-threaded debugger * Debug value tooltips in editor, debug probe, and interactive shell * Autocompletion in debug probe and interactive shell * Automatically updating project directories * Testing tool, currently supporting unittest derived tests (*) * OS Commands tool for executing and interacting with external commands (*) * Rewritten indentation analysis and conversion (*) * Introduction of Wing IDE 101, a free edition for beginning programmers * Available as a .deb package for Debian and Ubuntu * Support for Stackless Python * Support for 64 bit Python on Windows and Linux (*)'d items are available in Wing IDE Professional only. System requirements are Windows 2000 or later, OS X 10.3.9 or later for PPC or Intel (requires X11 Server), or a recent Linux system (either 32 or 64 bit). Compatibility Notes --- The file pattern in the Testing tab of Project Properties will need to be re-entered if the project was saved with one of the 3.0 alpha releases. Reporting Bugs -- Please report bugs using the Submit Bug Report item in the Help menu or by emailing support at wingware dot com. This is beta quality software that installs side-by-side with Wing 2.x or 1.x. We advise you to make frequent backups of your work when using any pre-release version of Wing IDE. Upgrading - To upgrade a 2.x license or purchase a new 3.x license: Upgradehttps://wingware.com/store/upgrade Purchase https://wingware.com/store/purchase Any 2.x license sold after May 2nd 2006 is free to upgrade; others cost 1/2 the normal price to upgrade. If you are not ready to upgrade, feel free to keep using a series of trial licenses. There will be no limit on the number of trials until 3.0 final is out. Thanks! The Wingware Team Wingware | Python IDE Advancing Software Development www.wingware.com -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: status of Programming by Contract (PEP 316)?
Python really isn't suitable for in-flight controls for various reasons, and mission critical concerns is a minor one (systems with Do you know anything about the FAA certification process for flight- critical systems? I am not an expert on it, but I know it is very expensive. If I am not mistaken, getting such code certified is more expensive than developing it in the first place. Why would that be so if, as you claim, mission critical concerns is a minor one? -- http://mail.python.org/mailman/listinfo/python-list
Coding Standards
'Good code' is code that works, is bug free, and is readable and maintainable. Standards need to be followed for coding. Read more... http://brsx.co.uk/SWtesting/FAQs/FAQs012.asp -- http://mail.python.org/mailman/listinfo/python-list
What's on at APL 2007, Montreal, October 21, (Tutorials) 22, 23 (Program)
( Details and abstracts coming to the APL 2007 web page http://www.sigapl.org/apl2007.html shortly. In the meantime ... ) Tutorials and workshops Introduction to APL (Ray Polivka) OO for APLers, APL for OOers (Dan Baronet) ... others in the works Presentations No Experience Necessary: Hire for Aptitude - Train for Skills (Brooke Allen) Compiling APL with APEX (Robert Bernecky) APL, Bioinformatics, Cancer Research (Ken Fordyce) Generic Programming on Nesting Structure (Stephan Herhut, Sven-Bodo Scholz, Clemens Grelck) Interactive Array-Based Languages and Financial Research (Devon McCormick) Array vs Non-Array Approaches to Programming Problems (Devon McCormick) Design Issues in APL/OO Interfacing (Richard Nabavi) Arrays of Objects, or Arrays within Objects (Richard Nabavi) Competing, with J (John Randall) Plus representatives of vendors: Dyalog -- IBM -- MicroAPL -- http://mail.python.org/mailman/listinfo/python-list
Re: fcntl problems
On 8/30/07, mhearne808 wrote: I'm having a number of problems with the fcntl module. Read this first: http://linux.die.net/man/2/flock First of all, if I try this: file = open(counter.txt,w+) fcntl.flock(file.fileno(), fcntl.LOCK_NB) I get this: --- type 'exceptions.IOError' Traceback (most recent call last) /Users/mhearne/src/python/ipython console in module() type 'exceptions.IOError': [Errno 9] Bad file descriptor That should be: fcntl.flock(f.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB) Proceeding forward with the locked file, let's say I do the above in Python interactive Process A. Then in python interactive Process B, I repeat the open function on the same file with the same permissions. Then, in each process, I write some text to the file using the write() method. After closing the file in both processes, the only text I see in the file is from Process B! This is due to two issues: caching and file position. When you open the file in both processes as 'w+', they are both positioned at the *current* EOF, but from that point on the offset is not externally influenced. The correct sequence of events should be: - open file in mode w+ - obtain exclusive lock - f.seek(0, 2) # (to end of file) - write to file - f.flush() # or f.close() - release lock Is this my lack of understanding, or have I discovered a bug? If you find yourself asking this question, it's too often the former :) -Miles -- http://mail.python.org/mailman/listinfo/python-list
Re: fcntl problems
Sorry, that last quote-only reply was accidental. :) On 8/30/07, mhearne808 wrote: I've been doing some experiments, and here are some specific examples to try. [snipped examples] From these last two experiments I can only conclude that file locking isn't doing a durned thing. What's going on? File locking isn't doing a durned thing in those cases because you're only obtaining the lock from a single process. According to my Python Cookbook: Exclusive lock: This denies all _other_ processes both read and write access to the file. This is only for mandatory locking; POSIX flock is advisory locking, which states: Only one process may hold an exclusive lock for a given file at a given time. Advisory locks don't have any effect on processes that don't use locks. Mandatory locks are kernel enforced, but non-POSIX and not available in Mac OS X. -Miles -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] | On Thu, 30 Aug 2007 17:09:36 +1000, Ben Finney wrote: | | [EMAIL PROTECTED] writes: | | What's with the index() function of lists throwing an exception on not | found? | | It's letting you know that the item isn't in the list. There's no | sensible return value from an index function in that condition. | | What about -1? C programmers do this all the time. :-) Because they do not have exceptions. -- http://mail.python.org/mailman/listinfo/python-list
Re: Coding Standards
[EMAIL PROTECTED] a écrit : 'Good code' is code that works, is bug free, and is readable and maintainable. Standards need to be followed for coding. Read more... http://brsx.co.uk/SWtesting/FAQs/FAQs012.asp You misstyped your URL and referenced a C++ related document, for Python its here: http://www.python.org/dev/peps/pep-0008/ ;-) -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
On Fri, 31 Aug 2007 01:15:04 -0400, Roy Smith wrote: Carl Banks [EMAIL PROTECTED] wrote: Python really isn't suitable for in-flight controls for various reasons, and mission critical concerns is a minor one (systems with less underlying complexity tend to have fewer failure modes). But mostly it's raw throughput: Python is just too slow. Flight control computers have to be powerful enough make a ton of mathematical calculations in a matter of milliseconds, and under strict weight and power constraints. The cost of running 100 times slower than optimal is just too high. I'm not convinced that's true for all avionics uses. Of course it's not. I was talking about flight control, not avionics in general. (Perhaps when single-engine Cessnas go digital we'll even see flight controllers in Python.) Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
[EMAIL PROTECTED] a écrit : On Aug 30, 4:28 pm, Ben Finney [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] writes: On Aug 30, 12:09 am, Ben Finney [EMAIL PROTECTED] wrote: It's letting you know that the item isn't in the list. There's no sensible return value from an index function in that condition. for str: find( sub[, start[, end]]) [...] Return -1 if sub is not found. -1 is used in other languages as well. It is no more sensible there than in the 'str.find' method, which is a historical wart. One man's sensible is another man's insensible. For instance, some people feel -1 as a valid index into a list is sensible. Other's find it insensible. Python 2.5.1 (r251:54863, May 2 2007, 16:56:35) [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2 Type help, copyright, credits or license for more information. print sensible[-1] e -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a multi-tier client/server application
Jeff [EMAIL PROTECTED] writes: Granted. But what I will be writing really will take a lot of extra work to get even close to the level of usability needed on the web vs. a desktop app. And I'll try not to write a crappy GUI ;-) OK. In the discussion with Chris, one factor that came up is how much time users will spend in front of the app and the amount of data they'll physically enter. If it's a lot, that weighs in favor of a desktop app. If it's not much, then maybe some gain in UI responsiveness isn't worth the downside of a client installation. Sorting certainly doesn't have to be done on the server side--in fact, in most cases I can think of where it would be useful for this app, it wouldn't have to be--in which case it's more responsive. Certainly exporting, importing and printing can all be done through the web-- I've done this plenty of times. But there is a huge amount of flexibility (and, in the case of printing, guaranteed style/quality/ layout) to be gained on the desktop. This I don't understand at all. How is the least bit of flexibility or style or quality guarantees gained by a desktop app? If you want fancy formatting, just use Reportlab to generate a pdf on the server and send it to the browser. All that said, I am most likely going to go with a desktop application. In reality, I will have to do whatever my client wants. Thank you *very* much for all of your input--one of the first things I have to do is make them a list of the pros and cons of web vs. desktop apps--and this will help a lot. Yes, that sounds like a good idea. vanrpeter-whatever: Thanks for the support :-) What did you use for networking? What ORMs did you try (or did you skip them altogether?) Have you ever written a serious GUI app before? I've never done any really fancy ones, but even the relatively simple ones I've done have turned out to be far more time consuming than I expected. Have you done much concurrent programming, either with threads or something like twisted? You're going to have to do that to keep your gui responsive, so you might put that on your list of things to study (in addition to networking and databases). -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
Carsten Haese car...ys.com wrote: .. If we start labeling people, this thread will earn you a label that rhymes with roll. weird this - maybe a native English speaker can comment - when I pronounce what fishermen do - it rhymes with roll, but when I am talking about the thing that lives under bridges and munches goats, the O sound is shorter, and more towards the back of my mouth. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
Hendrik van Rooyen wrote: weird this - maybe a native English speaker can comment - when I pronounce what fishermen do - it rhymes with roll, but when I am talking about the thing that lives under bridges and munches goats, the O sound is shorter, and more towards the back of my mouth. Native English accents vary as well, but _roll_ rhymes with _troll_, not _trawl_. _Trawl_ would rhyme with _fall_, and _fall_ definitely doesn't rhyme with _roll_. -- Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/ San Jose, CA, USA 37 20 N 121 53 W AIM, Y!M erikmaxfrancis I do not like work even when someone else does it. -- Mark Twain -- http://mail.python.org/mailman/listinfo/python-list
Requirement-HEAD OF TECHNOLOGY
Senior Position Vacant for www.123greetings.com Head of Technology (Kolkata, India) Responsibilities: To Scale the website to handle large volumes of user traffic. To lead the development team for Alexa Top 100 Web Property. To Manage Relationships with DataCenters, CDN/Bandwidth providers, ESP's etc. To Implement next generation of web technologies. Deliverables Increase User Access Speed of the Website * Implement Distributed DNS * Implement Web Catching/Acceleration Increase Website Uptime * Implement Load Balancing to handle 600 web servers * Manage servers spread across 5 Datacenters in 3 geographies * Implement Blade Servers/Web Farm Website Management * Improve Content Management System to update 50,000 WebPages daily. Website Features * Implement Web 2.0 Features to increase stickiness of the website. * Implement latest flash streaming technologies for content delivery. Data Mining Warehousing * To Collect Store huge volumes of user data. * To Structure Mine user data for trend, data analysis. Requirements: Profile Exp:-10Years In related field Required to manage lead the development team consist of PHP Perl Programmers, Project Managers, Action Script Developers, JavaScript Developers, Server Administrators. Website Technologies Operating Systems: Linux /Apache/FreeBSD; No Microsoft Technologies Development Languages: Open Source Technologies (Perl/PHP/MySQL) Front End languages: JavaScript, AJAX, HTML, CSS, Flash ActionScript Developers. Interested Candidate plz contact - [EMAIL PROTECTED] or visit http://www.123greetings.com/careers/form.html for more details -- http://mail.python.org/mailman/listinfo/python-list
MySQLdb ImportError
Hello! When I try to import the MySQLdb lib python generates an error: Traceback (most recent call last): File pyshell#0, line 1, in module import MySQLdb File C:\Python25\lib\site-packages\MySQLdb\__init__.py, line 19, in module import _mysql ImportError: DLL load failed with error code 193 This is on a AMD64 bit machine, when I import it on a 32 bit machine it works fine. Is there anyway to fix this? Is there a build for AMD64 bit machines or is there simply no way that I can get MySQLdb working on it? Thanks in advance, Sjoerd -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
On Aug 30, 7:20 pm, [EMAIL PROTECTED] (Alex Martelli) wrote: Russ [EMAIL PROTECTED] wrote: ... programs. Any idea how much Python is used for flight control systems in commercial transport aircraft or jet fighters? Hi Alex. I've always enjoyed your Piggies talks at Google (although I missed he last one because I was out of town). I'm disappointed to see that you seem to have taken personal offense from remarks I made to someone else who attacked me first. I will take issue with some of your remarks, bit none of it is intended to be personal, and I sincerely hope you don't take it that way. Are there differences in reliability requirements between the parts of such control systems that run on aircraft themselves, and those that run in airports' control towers? Because Python *IS* used in the latter case, cfr http://www.python.org/about/success/frequentis/ ... if on-plane control SW requires hard-real-time response, that might be a more credible reason why Python would be inappropriate (any garbage collected language is NOT a candidate for hard-real-time SW!) than your implied aspersions against Python's reliability. I've seen that site before. They have a nice product that was developed in Python, but it is not clear to me that is actually safety-critical. It appears to be a GUI designer for displays at air traffic control towers. I can't tell if this is just a development tool, or if it the python-based product is actually used directly by controllers. Also, this product does not seem to actually display aircraft to controllers. It seems to be more of a semi-static display of runway conditions. Not to minimize its importance, but I don't know if this product actually qualifies as safety critical, and if it does, it probably does so only marginally. According to http://uptime.pingdom.com/site/month_summary/site_name/www.google.com, Google's current uptime is around 99.99%, with many months at 100% and a few at 99.98% -- and that's on *cheap*, not-that-reliable commodity HW, and in real-world conditions where power can go away, network cables can accidentally get cut, etc. I'm Uber Tech Lead for Production Systems at Google -- i.e., the groups I uber-lead are responsible for some software which (partly by automating things as much as possible) empowers our wondrous Site Reliability Engineers and network specialists to achieve that uptime in face of all the Bad Stuff the world can and does throw at us. Guess what programming language I'm a well-known expert of...? I certainly cannot deny the success of Google, but I don't think that a high uptime with thousands of servers is comparable to reliable safety-critical software. You can't put thousands of flight management computers on an airplane and just switch over to another as they go fail. And if a web server gives bogus results nobody worries much, but if a flight computer gives bogus outputs, some people worry a lot. By the way, I use Google Groups, and it has a few annoying glitches. For example, I couldn't read your post without scrolling horizontally. With all the money and manpower at Google's disposal, couldn't you fix that problem? Another problem I have had for months is that when I write a message to post, I get no auto scrolling, so I have to add manual line breaks to keep the text from running out of the window -- then the reader sees all those ugly misplaced line breaks in the output. These are just annoyances, but why hasn't Google fixed them yet? The point I am trying to make is that, while Google does great things, and is very successful commercially, the quality of its code could certainly use some improvement. Microsoft is also very successful commercially, but certainly you wouldn't argue that is is a result of the quality of its software, I hope. I may have a simplistic view, but I have always thought that the requirements of most Google code are the very antithesis of the requirements of safety critical code. When I do a search, I fully expect most of the results to be crap. It's a scattershot approach. If I get one good result, I am usually happy. Safety critical software is exactly the opposite: if you get one *bad* result, you could be in a heap of something nasty. The important question is this: why do I waste my time with bozos like you? Yeah, good question indeed, and I'm asking myself that -- somebody who posts to this group in order to attack the reliability of the language the group is about (and appears to be supremely ignorant about its use I am sorry that you took offense at my pointing out the weaknesses of Python. It's a great language for certain kinds of applications, but it is not necessarily appropriate for everything. I am personally using it for prototyping a safety critical system that, if it is ultimately fielded, will affect the safety of millions of people, including you. However, my Python prototype is for research and design purposes. The ultimate
Re: Setting a read-only attribute
On Aug 30, 11:35 pm, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I have an object and wish to set an attribute on it which, unfortunately for me, is read-only. How can I go about this? Cheers. -T Could you show the object you want to set his attribute? Until that, it's difficult to answer to you. PS: If the attribut is on read only, their must a good reason for that ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
On Thu, 30 Aug 2007 22:56:54 -0700, Russ wrote: Python really isn't suitable for in-flight controls for various reasons, and mission critical concerns is a minor one (systems with Do you know anything about the FAA certification process for flight- critical systems? I am not an expert on it, but I know it is very expensive. If I am not mistaken, getting such code certified is more expensive than developing it in the first place. Why would that be so if, as you claim, mission critical concerns is a minor one? I made no such claim; you misconstrued what I wrote. I wrote that mission critical concerns are a minor reason why Python is not used, not that mission critical concerns were minor. As a matter of fact, FAA cert is a major pain, and they unit test the hell out of everything. I'm not aware of any reason why Python couldn't be certified if it passed the tests, but it likely wouldn't pass as easily as a compiled language. OTOH, spiffy features like design-by- contract aren't going to improve your chances of getting FAA cert, either. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
[EMAIL PROTECTED] a écrit :
(snip)
I don't think that is the definition used across computer science.
It suddenly dawned on me that what would be best would be a contains()
(or IN syntax for those who can't afford to wait) for lists.
No need to wait:
'a' in ['a', 'b']
True
['a', 'b'].__contains__('a')
True
--
http://mail.python.org/mailman/listinfo/python-list
Re: Simple elementtree question
IamIan wrote: Thank you very much! That did it. In the source XML item tags have rdf:about attributes with the link to the story, and it was here I planned on grabbing the link and matching it up with the title child text. After seeing the output of elmenttree's getiterator() though, it now looks like each item, title, description, and link is a separate element... I could use a dictionary or lists to match the first title to the first link, but is there a more elegant way in elementtree (or otherwise) to do this? You can iterate over the channel Elements and then select the title child (el.find()) to see if it's interesting. You can also try lxml.etree, which supports XPath: from lxml import etree find_channel = etree.XPath(//channel[title = $title]) tree = etree.parse(http://somewhere/the_document.xml;) channel = find_channel(tree, title=example title) print channel.findtext(link) or lxml.objectify: from lxml import etree, objectify find_channel = etree.XPath(//channel[title = $title]) tree = objectify.parse(http://somewhere/the_document.xml;) channel = find_channel(tree, title=example title) print channel.title, channel.link http://codespeak.net/lxml Stefan -- http://mail.python.org/mailman/listinfo/python-list
Do you have any complete example for creating msi file(doing file copying)
Thank you for the help that you are going to give me. I have a project where in which i want to create a msi file just as python-package while installing python on the system. Just copying the files to the user given target directory. i want to create similar msi file for my project that just copies the file. Can you please help me in providing the complete procedure of creating the msi file using the python. Does msilib library in the release 2.5 have this capability? Please help me Thanks Sid Get the freedom to save as many mails as you wish. Click here to know how. Once upon a time there was 1 GB storage in your inbox. To know the happy ending go to http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html-- http://mail.python.org/mailman/listinfo/python-list
Re: beginner, idomatic python 2
bambam a écrit : Bruno Desthuilliers [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] As a side note, in Python, inheritance ... ... should usually not be used for typing. :~( I'm sorry, I don't even know what that means... The code I have inherited from someone only a little more knowledgeable than me, and is still full of development artifacts anyway. The Pwr and Psp classes inherit from the Device class not neccessarily because that is a Good Thing, more because the development process led to them being thought of that way. All devices have a mixture of common and differing attributes. What is 'typing'? Mmm... Most CS experts don't really agree on this, and I'm certainly not one (expert). So I won't even try to explain it by myself, and let you google for type system, static typing, dynamic typing, duck typing etc... Now what I meant here is that in Python, you don't have to make class B inherit from class A to let you use an instance of B where an instance of A was expected - all you need is that both objects share the set of attributes and methods you're going to use. Inheritence is only useful for sharing common code. HTH -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
Russ a écrit : Pre and post conditions applying to the class ? Now that's an interesting concept. IIRC, Eiffels pre and post conditions only apply to methods, and I fail to see how they could apply to a class. But since you're an expert on the subject, I don't doubt you'll enlighten us ? I made a simple mistake. Excuse me. Oh wait ... aren't you one of the sensitivity police who laid into me for criticizing someone else. Nope, I'm one of the regular citizens here that tried to make you realize you were acting as an arrogant clueless newbie. For the record, the guy I criticized made ridiculous assertions about DBC. For the record, the guy you treaded as he was a retarted knows much more than you about both Python and DbC. Thinking that someone is ignorant or ridiculous because he does not happen to share your opinions on some subject is certainly not what's I'd call an intelligent, civilized, respectful attitude. All I did was to make a simple mistake about an inconsequential matter. All you did was persisting on being arrogant while showing your lack of knowledge on both Python and DbC. No, pre and post conditions obviously don't apply to classes, but all I said was that that's how it appeared to me at first glance. If you are upset about my criticism of one of your colleagues, please tell him to quite making outrageous assertions about something he obviously knows little about. I'm not upset. I'm actually trying to help you realizing the dumbness of your attitude. But I'm afraid this is going to be a lost cause... -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
Russ a écrit : FWIW, the Eiffel and SPARK Ada folks also brilliantly explained why one can not hope to write reliable programs without strict static declarative type-checking. And they are probably right. And they are obviously wrong, by empiric experience. I don't think you understand what they mean by reliable programs. I think you should stop over-estimating yourself, and start realizing that there are quite a lot of experimented programmers here. The important question is this: why do I waste my time with bozos like you? The same question is probably crossing the mind of quite a lot of people here - but the 'bozo' might not be who you think. -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
On Aug 31, 8:47 am, Erik Max Francis [EMAIL PROTECTED] wrote: Hendrik van Rooyen wrote: weird this - maybe a native English speaker can comment - when I pronounce what fishermen do - it rhymes with roll, but when I am talking about the thing that lives under bridges and munches goats, the O sound is shorter, and more towards the back of my mouth. Native English accents vary as well, but _roll_ rhymes with _troll_, not _trawl_. _Trawl_ would rhyme with _fall_, and _fall_ definitely doesn't rhyme with _roll_. -- Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/ San Jose, CA, USA 37 20 N 121 53 W AIM, Y!M erikmaxfrancis I do not like work even when someone else does it. -- Mark Twain I say the 'oll' in troll like the 'ol' in frolic, and pronounce roll and role similarly. My accent is probably from the East Midlands of the UK, but is not pronounced. - Paddy. -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
On Aug 31, 10:02 am, Russ [EMAIL PROTECTED] wrote: Hi Alex. I've always enjoyed your Piggies talks at Google (although I missed he last one because I was out of town). I'm disappointed to see that you seem to have taken personal offense from remarks I made to someone else who attacked me first. I am curious. Why do you think I attacked you? The conversion went as follows: On Aug 29, 7:21 am, Russ [EMAIL PROTECTED] wrote: Thanks for that information. That's too bad, because it seems like a strong positive capability to add to Python. I wonder why the cold reception. Were there problems with the idea itself or just the implementation? Or is it just a low priority? me: Why do you think that would ad a strong positive capability? To me at least it seems a big fat lot of over-engineering, not needed in 99% of programs. In the remaining 1%, it would still not be needed since Python provides out of the box very powerful metaprogramming capabilities so that you can implement yourself the checks you need, if you really need them. Basically you said I think DbC is good and I said I don't think so. I would not call that an attack. If you want to see an attack, wait for Alex replying to you observations about the low quality of code at Google! ;) Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
Paddy wrote: I say the 'oll' in troll like the 'ol' in frolic, and pronounce roll and role similarly. My accent is probably from the East Midlands of the UK, but is not pronounced. _Troll_ and _frolic_ aren't pronounced with the same o sound in any accent I've ever heard of. Which you pronounce _boat_ and _bot_ the same way, too? -- Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/ San Jose, CA, USA 37 20 N 121 53 W AIM, Y!M erikmaxfrancis There are no dull subjects. There are only dull writers. -- H.L. Mencken -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
Erik Max Francis wrote: Paddy wrote: I say the 'oll' in troll like the 'ol' in frolic, and pronounce roll and role similarly. My accent is probably from the East Midlands of the UK, but is not pronounced. _Troll_ and _frolic_ aren't pronounced with the same o sound in any accent I've ever heard of. Which you pronounce _boat_ and _bot_ the same way, too? [Amusingly contemplating a trolling war about the pronunciation of troll] Well they sound the same in my more-or-less South London accent. I can't write those funny phonetic symbols (and I hate to imagine the Unicode encoding hoops I'd have to jump through to make them readable anyway) but both os sound short to me. Like bot rather than boat using your example. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
[EMAIL PROTECTED] (Alex Martelli) writes: Yeah, good question indeed, and I'm asking myself that -- somebody who posts to this group in order to attack the reliability of the language the group is about (and appears to be supremely ignorant about its use in air-traffic control and for high-reliability mission-critical applications such as Google's Production Systems software) might well be considered not worth responding to. OTOH, you _did_ irritate me enough that I feel happier for venting in response;-) Hi Alex, I'm a little confused: does Production Systems mean stuff like the Google search engine, which (as you described further up in your message) achieves its reliability at least partly by massive redundancy and failover when something breaks? In that case why is it so important that the software be highly reliable? Is a software fault really worse than a hardware fault, especially if it's permissible to sometimes let a transaction (like a search query) go uncompleted (e.g. by displaying a try again later message)? If you get 1 billion queries in a month and a half dozen of them don't complete (e.g. they give empty or incorrect results when there are some good hits they should display) but the server is never actually down, can you still claim 100% uptime? There's a philosophy in Erlang described as let it crash, i.e. programmers are told NOT to program defensively such as by checking inputs for validity. Instead they should just rely on the fault tolerance and process restart stuff to get things going again if their process fails. Similarly if the Google search software hits some fatal condition once in a while, maybe it's enough to just treat it as a crashed box and let the failover mechanisms handle the problem. Of course then there's a second level system to manage the restarts that has to be very reliable, but it doesn't have to deal with much weird concocted input the way that a public-facing internet application has to. Therefore I think Russ's point stands, that we're talking about a different sort of reliability in these highly redundant systems, than in the systems Russ is describing. -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
On 2007-08-31, Erik Max Francis [EMAIL PROTECTED] wrote: I say the 'oll' in troll like the 'ol' in frolic, and pronounce roll and role similarly. My accent is probably from the East Midlands of the UK, but is not pronounced. _Troll_ and _frolic_ aren't pronounced with the same o sound in any accent I've ever heard of. Welcome to England! Which you pronounce _boat_ and _bot_ the same way, too? No. HTH HAND. -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
Michele Simionato [EMAIL PROTECTED] writes: http://archive.eiffel.com/doc/manuals/technology/contract/ariane/page... That paper contains only a good think: a link to the contrarian view http://home.flash.net/~kennieg/ariane.html#s3.1.5 I like the contrarian article much better than the Eiffel sales pitch. -- http://mail.python.org/mailman/listinfo/python-list
OT: pronounciation [was: list index()]
Tim Golden wrote: Erik Max Francis wrote: Paddy wrote: I say the 'oll' in troll like the 'ol' in frolic, and pronounce roll and role similarly. My accent is probably from the East Midlands of the UK, but is not pronounced. _Troll_ and _frolic_ aren't pronounced with the same o sound in any accent I've ever heard of. Which you pronounce _boat_ and _bot_ the same way, too? [Amusingly contemplating a trolling war about the pronunciation of troll] Well they sound the same in my more-or-less South London accent. I can't write those funny phonetic symbols (and I hate to imagine the Unicode encoding hoops I'd have to jump through to make them readable anyway) but both os sound short to me. Like bot rather than boat using your example. Since we're talking... I'm still a little startled when I listen to some of the excellent webcasts that are being produced these days (showmedo.com and friends) and hear American voices pronounce Python... well, the way they do, with the stress and something of a drawl on the second syllable. I'm sure it's just as amusing the other way round: we pronounce it with the stress on the first syllable and the characteristic short vowel sound in the second. (Something like: Pie'thun). TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
Russ wrote: I've always wondered... Are the compilers (or interpreters), which take these programs to machine code, also formally proven correct? No, they are not formally proven correct (too complicated for that), but I believe they are certified to a higher level than your typical compiler. I think that Ada compilers used for certain safety-critical applications must meet higher standards than, say, GNU Ada, for example. And the OS in which those programs operate, are they also formally proven correct? Same as above, if I am not mistaken. And the hardware, microprocessor, electric supply, etc. are they also 'proven correct'? I think the microprocessors used for flight control, for example, are certified to a higher level than standard microprocessors. How would you prove a power supply to be correct? I'm sure they meet higher reliability standards too. In that case why don't we just 'certify to a higher level' the programs and get done with this formal proofs? We should remember that the level of security of a 'System' is the same as the level of security of it's weakest component, so either we formally prove all those other very important components (OS gets MUCH more use than the program (the program uses it for almost every other action)) or get done with the whole fuss. -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
Ricardo Aráoz [EMAIL PROTECTED] writes: In that case why don't we just 'certify to a higher level' the programs and get done with this formal proofs? We should remember that the level of security of a 'System' is the same as the level of security of it's weakest component, so either we formally prove all those other very important components (OS gets MUCH more use than the program (the program uses it for almost every other action)) or get done with the whole fuss. This url has some info on the topic of certification etc.: http://www.dwheeler.com/essays/high-assurance-floss.html -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
[Carsten] .. If we start labeling people, this thread will earn you a label that rhymes with roll. [Hendrik] weird this - maybe a native English speaker can comment - when I pronounce what fishermen do - it rhymes with roll, but when I am talking about the thing that lives under bridges and munches goats, the O sound is shorter, and more towards the back of my mouth. But - the word for someone who posts to the internet with the intention of stirring up trouble derives from the word for what fishermen do, not from the word for something that lives under a bridge. It derives from trolling for suckers or trolling for newbies. -- Richie Hindle [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: Registering a python function in C
fernando [EMAIL PROTECTED] writes: Could someone post an example on how to register a python function as a callback in a C function? If I understand correctly, your C function receives a Python function (as a function object of type PyObject *), which you need to call from C. To do that, call PyObject_CallFunction(obj, format, args...) where format and args are documented in http://docs.python.org/api/arg-parsing.html. Does that help? Also note that there is a dedicated mailing list for the Python/C API; see http://mail.python.org/mailman/listinfo/capi-sig . -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
On Thu, 30 Aug 2007 21:33:43 -0700, TheFlyingDutchman wrote On Aug 30, 9:06 pm, Carsten Haese [EMAIL PROTECTED] wrote: On Thu, 30 Aug 2007 20:17:00 -0700, zzbbaadd wrote Well IN was what I was looking for and would have saved this thread. However I don't believe IN showed up on the doc web page that has list methods, where I found index(). They're not on the exact same page, but index() is in section 3.6.4 of the library reference (http://docs.python.org/lib/typesseq-mutable.html), whereas in is in section 3.6 of the library reference (http://docs.python.org/lib/typesseq.html). I'm wondering how you managed to find subsection 3.6.4 without finding section 3.6. www.google.com search python list methods first search find: 5. Data Structures The list methods make it very easy to use a list as a stack, where the last element added Another useful data type built into Python is the dictionary. ... http://docs.python.org/tut/node7.html The list data type has some more methods. Here are all of the methods of list objects: Fair enough, but that's a tutorial. It would be foolish to demand that a tutorial be a complete reference for everything that can be done with a list. The page lists all methods of list objects, but there are more things one can do with lists that don't look like method calls. For example, it doesn't say that you can compare lists. It doesn't say that you can read and write elements in the lists. Would you automatically assume that those things aren't possible? I hope not. (Of course, those operations are handled by the magical methods __eq__, __setitem__, __getitem__ etc, but I think one can forgive the tutorial for not mentioning those in the interest of not confusing beginners.) By your logic, no web page would be allowed to say anything about lists unless it says *everything* about lists, and that wouldn't be very useful. -- Carsten Haese http://informixdb.sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list
Re: python + gcov
I always bit the bullet and finally just did that. and here the steps to follow ... http://plexity.blogspot.com/2006/02/profiling-python-extensions.html laurent -- http://mail.python.org/mailman/listinfo/python-list
Pylons, SQLAlchemy, too many connections problem.
Hello. I have pylons 0.96 (SVN) and current SQLAlchemy (0.3.10), and I have bug that doesn't exist earlier. My connection code: code import sqlalchemy.mods.threadlocal from sqlalchemy import DynamicMetaData, objectstore metadata = DynamicMetaData( case_sensitive = False ) def db_connect( dsn ): engine = create_engine( dsn, echo=False, echo_pool=False, encoding='latin2', convert_unicode=True ) metadata.connect( engine ) /code command netstat -an|grep 5432|grep ESTABLISHED|wc -l displays one more connection after each refresh of page until I have exceptions such as: sqlalchemy.exceptions.DBAPIError: (Connection failed) (OperationalError) FATAL: sorry, too many clients already What is wrong? -- http://mail.python.org/mailman/listinfo/python-list
Re: Pylons, SQLAlchemy, too many connections problem.
Adam Kubica a écrit : Hello. I have pylons 0.96 (SVN) and current SQLAlchemy (0.3.10), and I have bug that doesn't exist earlier. My connection code: code import sqlalchemy.mods.threadlocal from sqlalchemy import DynamicMetaData, objectstore metadata = DynamicMetaData( case_sensitive = False ) def db_connect( dsn ): engine = create_engine( dsn, echo=False, echo_pool=False, encoding='latin2', convert_unicode=True ) metadata.connect( engine ) /code command netstat -an|grep 5432|grep ESTABLISHED|wc -l displays one more connection after each refresh of page until I have exceptions such as: sqlalchemy.exceptions.DBAPIError: (Connection failed) (OperationalError) FATAL: sorry, too many clients already What is wrong? I don't know for sure, but I guess you'd get better answers posting either on the Pylons or SQLAlchemy's google groups. -- http://mail.python.org/mailman/listinfo/python-list
win32com problem: more than one instance
Hello,
I start my script convert.py simultaneously in any dos-shells several
times. But I get every time the same solidworks instance.
I see in the proccess (task) manager only one solidworks.exe
Therefore I get for all simultaneous conversions the same output file.
I tested the same code with excel (test_excel.py) and her I get many
instances of excel in proccess (task) manager.
How can I get many instances of solidworks?
Is it a problem of python?
Or is it a problem of the Solidworks-COM-Implemention and I get the
same problem with an C++ client implementation?
Thanks for your help, Thomas
convert.py
import pythoncom
pythoncom.CoInitializeEx(pythoncom.COINIT_MULTITHREADED)
sldworks = gencache.EnsureModule('{83A33D31-27C5-11CE-
BFD4-00400513BB57}', 0x0, 13, 0)
sw = sldworks.ISldWorks(DispatchEx('SldWorks.Application'))
swmodel, errors, warnings = sw.OpenDoc6(sourceName,
constants.swDocPART, constants.swOpenDocOptions_Silent, )
activeDoc = sw.ActiveDoc
retval, errors, warnings = swmodel.SaveAs4(targetName,
constants.swSaveAsCurrentVersion ,
constants.swOpenDocOptions_Silent )
pythoncom.CoUninitialize()
test_excel.py
import pythoncom
pythoncom.CoInitializeEx(pythoncom.COINIT_MULTITHREADED)
myExcel = win32com.client.DispatchEx('Excel.Application')
myExcel.Visible = 1
Excel = myExcel.Workbooks.Open(excelfile, 0, False, 2)
Excel.Saved = 1
Excel.Close()
myExcel.Quit()
del myExcel
del Excel
pythoncom.CoUninitialize()
--
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Re: win32com problem: more than one instance
Thomas Rademacher wrote: Hello, I start my script convert.py simultaneously in any dos-shells several times. But I get every time the same solidworks instance. I see in the proccess (task) manager only one solidworks.exe Therefore I get for all simultaneous conversions the same output file. I *think* -- and I'm really hoping someone more knowledgeable can chip in here -- that it's down to the particular COM object implementation. ie Excel may choose to offer you separate instances (or whatever they're called) while SolidWorks may not. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: Pylons, SQLAlchemy, too many connections problem.
On Fri, 31 Aug 2007 14:03:48 +0200, Adam Kubica wrote: Hello. I have pylons 0.96 (SVN) and current SQLAlchemy (0.3.10), and I have bug that doesn't exist earlier. My connection code: code import sqlalchemy.mods.threadlocal from sqlalchemy import DynamicMetaData, objectstore metadata = DynamicMetaData( case_sensitive = False ) def db_connect( dsn ): engine = create_engine( dsn, echo=False, echo_pool=False, encoding='latin2', convert_unicode=True ) metadata.connect( engine ) /code command netstat -an|grep 5432|grep ESTABLISHED|wc -l displays one more connection after each refresh of page until I have exceptions such as: sqlalchemy.exceptions.DBAPIError: (Connection failed) (OperationalError) FATAL: sorry, too many clients already What is wrong? Don't use DynamicMetaData(), use MetaData(), it's the problem. -- http://mail.python.org/mailman/listinfo/python-list
Google spreadsheets
I would like to upload a tab-separated file to a Google spreadsheet from Python. Does anybody have a recipe handy? TIA, Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: Python doesn't see the directories I create
On 2007-08-31, Lawrence D'Oliveiro [EMAIL PROTECTED] wrote: In message [EMAIL PROTECTED], Neil Cerutti wrote: Keeping in mind which came first, isn't it at least as accurate to attribute this problem to Python's choice of escape character? No, it's Microsoft's fault. The use of backslash as an escape character goes back to Unix systems in the early 1970s--long before Microsoft came on the scene. When Microsoft introduced MS-DOS 1.0 in 1981, it didn't have directory hierarchies. Commands used the slash character to delimit options. Then when MS-DOS 2.0 introduced subdirectories in 1983, they decided they couldn't use the slash as the path separator, so they used the backslash instead. That has been a source of confusion ever since then. Going back and checking the Python History page, it seems I was off by four years with when I thought Python was first released (I was thinking 1995, when the first release was actually 1991). That makes Python's choice of escape character way more practical than I thought, since Microsoft hadn't yet conquered the desktop computing world when Python was in it's infancy. That strange whirring sound is me backpedaling furiously. Thanks very much for all your patiences. -- Neil Cerutti If you throw at someone's head, it's very dangerous, because in the head is the brain. --Pudge Rodriguez -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
On 2007-08-31, Ricardo Aráoz [EMAIL PROTECTED] wrote: Russ wrote: Yes, thanks for reminding me about that. With SPARK Ada, it is possible for some real (non-trivial) applications to formally (i.e., mathematically) *prove* correctness by static analysis. I doubt that is possible without static declarative type- checking. SPARK Ada is for applications that really *must* be correct or people could die. I've always wondered... Are the compilers (or interpreters), which take these programs to machine code, also formally proven correct? And the OS in which those programs operate, are they also formally proven correct? And the hardware, microprocessor, electric supply, etc. are they also 'proven correct'? Who watches the watchmen? The contracts are composed by the programmers writing the code. Is it likely that the same person who wrote a buggy function will know the right contract? -- Neil Cerutti The third verse of Blessed Assurance will be sung without musical accomplishment. --Church Bulletin Blooper -- http://mail.python.org/mailman/listinfo/python-list
Re: reload(sys)
On 31 A ustos, 04:24, Steven Bethard [EMAIL PROTECTED] wrote:
Sönmez Kartal wrote:
I've had an encoding issue and solved it by
sys.setdefaultencoding('utf-8')...
My first try wasn't successful since setdefaultencoding is not named
when I imported sys module. After, I import sys module, I needed to
write reload(sys) also.
I wonder why we need to call reload(sys) to get setdefaultencoding
named?
sys.setdefaultencoding is purposely deleted from the sys module after
it's loaded because you really shouldn't be using it. The reload() call
restores the deleted attribute.
If you'd like a less brittle solution to your encoding issue, explain
what the issue was, and people here can probably help you find a better
solution.
STeVe
I was using the XMLBuilder(xmlbuilder.py). I'm writing XML files as
f.write(str(xml)). At execution of that line, it gives error with
description, configure your default encoding... My operating system's
default is utf-8, and Emacs' is utf-8 too. Default of XMLBuilder is
utf-8 too. There were some characters interpreter may couldn't print
in ascii. I have tried to replace those characters like (TM) (R)... I
cannot remember them right now, but if necessary I can find them
easily...
This is the part of xmlbuilder.py which raises the error.
try:
if self.pretty:
# tabs are evil, so we will use two spaces
outstr = self._dom.toprettyxml(
,encoding=self.encoding)
else:
outstr = self._dom.toxml(encoding=self.encoding)
except UnicodeDecodeError:
sys.stderr.write('Decoding Error: You must configure
default encoding\n')
sys.exit()
What I can do instead of import sys; reload(sys);
sys.setdefaultencoding('utf-8')?
Happy coding
--
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How to use Resource Editor in wxPython ?
Disappointing me extremely, with the generate python function within Resource Editor, I only get a segment of python code which load xrc(xml format) file, rather than real python code in which I could append my own code. Does that mean RE(Resource Editor) is of little use? I hope not, maybe the way I use it is wrong? Tell me please. -- http://mail.python.org/mailman/listinfo/python-list
Re: pure python for sms
Neil Hodgson wrote: Gerardo Herzig: Hi dudes. Im looking for a python implementation for sending sms to a cell phone. I was try using some free pages, but i want to use a python. Do i need a cellphone conected to my machine? Or can i send sms to some cell via some python library? This is likely to cost some money similar to sending an SMS from a 'phone. There are several companies that provide SMS sending services that can be accessed through HTTP. Have a look at www.clickatell.com and www.aql.com . Here is a library based on Clickatell: http://www.powertrip.co.za/code/python/clickatell.py Neil Well, im not triyng to send a SMS `FROM' a cellphone, im trying to send a SMS `TO' a cellphone. Here (in Argentina) are several sites who lets you send a sms for free. You also can receive SMS responses via this page http://sms.personal.com.ar/Mensajes/msn.htm While my tries using this page via urllib failed, i dont want to depend on an external page anyway. The python class you send to me looks like a pay site (if not, i dont see why the tokenpay() and getbalance() methods :) I was also avaiable to send a sms in the form of an plain email [EMAIL PROTECTED], but it not seems to work this way no longer. Again, i dont want to do it that way anyway. Thats why im looking for a python implementation of that funcionality. Thanks! Gerardo -- http://mail.python.org/mailman/listinfo/python-list
Re: Let's Unite Against Jews and Mongrels!
Barry OGrady wrote: He has some wrong ideas. The blacks are victims of the jews as well. And Jews are the victims of Christians. And Christians are the victims of Muslims. Anybody not a victim of anyone else, please raise your hand! /W -- http://mail.python.org/mailman/listinfo/python-list
Re: pure python for sms
On 8/31/07, Gerardo Herzig [EMAIL PROTECTED] wrote: Well, im not triyng to send a SMS `FROM' a cellphone, im trying to send a SMS `TO' a cellphone. Here (in Argentina) are several sites who lets you send a sms for free. You also can receive SMS responses via this page http://sms.personal.com.ar/Mensajes/msn.htm While my tries using this page via urllib failed, i dont want to depend on an external page anyway. The python class you send to me looks like a pay site (if not, i dont see why the tokenpay() and getbalance() methods :) I was also avaiable to send a sms in the form of an plain email [EMAIL PROTECTED], but it not seems to work this way no longer. Again, i dont want to do it that way anyway. Thats why im looking for a python implementation of that funcionality. Well but sooner or later you will have to pass your sms through some cellular system network whose services someone has to pay for...no? Francesco -- http://mail.python.org/mailman/listinfo/python-list
Re: create Powerpoint via com
On Aug 30, 11:55 pm, Alan Isaac [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: code OK, creating bulleted lists, or tables, or adding pictures is all straightforward. How about chart creation (in Ppt 2003)? I do not see how to do this with Python. Thanks, Alan Alan, You probably need to browse the COM object using PythonWin, which is a part of the ActiveState distro. You can also use Python's builtin function, dir, to find out various methods of COM. Here's some info in messing with charts in Excel, which should be similar to chart manipulation in PowerPoint. http://mail.python.org/pipermail/python-win32/2005-June/003511.html http://mail.python.org/pipermail/python-win32/2003-March/000839.html http://www.thescripts.com/forum/thread21565.html http://mathieu.fenniak.net/plotting-in-excel-through-pythoncom/ Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: How to use Resource Editor in wxPython ?
On Aug 31, 7:49 am, codemania [EMAIL PROTECTED] wrote: Disappointing me extremely, with the generate python function within Resource Editor, I only get a segment of python code which load xrc(xml format) file, rather than real python code in which I could append my own code. Does that mean RE(Resource Editor) is of little use? I hope not, maybe the way I use it is wrong? Tell me please. You can use the code generated with your wxPython code; but when using XRCed, you need to do two-stage creation, which the generated code mentions. It even provides a link: http://wiki.wxpython.org/index.cgi/TwoStageCreation I thought this one was good reading too: http://wiki.wxpython.org/index.cgi/UsingXmlResources I like it depending on the complexity of the project. It can seriously reduce GUI code clutter. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: fcntl problems
On Aug 31, 12:23 am, Miles [EMAIL PROTECTED] wrote: Sorry, that last quote-only reply was accidental. :) On 8/30/07, mhearne808 wrote: I've been doing some experiments, and here are some specific examples to try. [snipped examples] From these last two experiments I can only conclude that file locking isn't doing a durned thing. What's going on? File locking isn't doing a durned thing in those cases because you're only obtaining the lock from a single process. According to my Python Cookbook: Exclusive lock: This denies all _other_ processes both read and write access to the file. This is only for mandatory locking; POSIX flock is advisory locking, which states: Only one process may hold an exclusive lock for a given file at a given time. Advisory locks don't have any effect on processes that don't use locks. Mandatory locks are kernel enforced, but non-POSIX and not available in Mac OS X. -Miles I think I'm still confused. Maybe I should explain the behavior that I want, and then figure out if it is possible. I have a script that will be run from a cron job once a minute. One of the things this script will do is open a file to stash some temporary results. I expect that this script will always finish its work in less than 15 seconds, but I didn't want to depend on that. Thus I started to look into file locking, which I had hoped I could use in the following fashion: Process A opens file foo Process A locks file foo Process A takes more than a minute to do its work Process B wakes up Process B determines that file foo is locked Process B quits in disgust Process A finishes its work Since I couldn't figure out file locking, I decided to just have Process A create a pid file in the directory - analogous to the Occupied sign on an airplane bathroom. This works, but it seems a little hacky. --Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: pure python for sms
On 31 Aug, 15:36, Gerardo Herzig [EMAIL PROTECTED] wrote: Neil Hodgson wrote: This is likely to cost some money similar to sending an SMS from a 'phone. [...] Well, im not triyng to send a SMS `FROM' a cellphone, im trying to send a SMS `TO' a cellphone. Yes, but he did write similar to, meaning that regardless of how the message is prepared, sending it may cost someone some money - the typical financial effect when you send a message from an actual telephone. Here (in Argentina) are several sites who lets you send a sms for free. You also can receive SMS responses via this pagehttp://sms.personal.com.ar/Mensajes/msn.htm I guess you're thinking about a library like SMSLib: http://smslib.org/ This seems to combine the two most obvious ways of sending such messages: communicate with a device already located on the GSM network; communicate with a gateway which relays messages to the GSM network. While my tries using this page via urllib failed, i dont want to depend on an external page anyway. The python class you send to me looks like a pay site (if not, i dont see why the tokenpay() and getbalance() methods :) I was also avaiable to send a sms in the form of an plain email [EMAIL PROTECTED], but it not seems to work this way no longer. Again, i dont want to do it that way anyway. Yes, both of the above (use of a Web site or an e-mail relay) rely on existing services. If you don't want to do that, you'll need to connect directly to your own GSM-capable device, I imagine. Thats why im looking for a python implementation of that funcionality. I don't know how well SMSLib works with Jython or whether you could take a PyLucene-like approach and wrap it for CPython using SWIG or some other wrapper technology in conjunction with gcj, but that's one approach. Another is to look into libraries which communicate with mobile devices: I extended one called t616hack [1] and made it almost capable of telling my T610 telephone to send messages, but another candidate would be python-gammu [2]. A while back someone stumbled across a GSM hardware module which has embedded Python as a feature [3], but I imagine that a lot of GSM-capable hardware uses AT-like commands to support such activities. Of course, I've probably covered an area that you're not directly interested in, but someone has to provide a link to the GSM network, either in the network infrastructure or by using some kind of GSM device. If you're not a GSM network operator then it's likely that you're either going to need to deal with a network operator, perhaps indirectly, or you'll need to join the GSM network with a suitable device in the normal way. Paul [1] http://www.python.org/pypi/t616hack [2] http://cihar.com/gammu/python/ [3] http://www.telit.co.it/product.asp?productId=113 -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
Fair enough, but that's a tutorial. It would be foolish to demand that a tutorial be a complete reference for everything that can be done with a list. I wasn't demanding anything of the page. I was pointing out how I made the assumption there was no way to find out if a list has a value other than by using index(). I am not used to having keywords in a language operate on a data structure, in addition to its methods. The page lists all methods of list objects, but there are more things one can do with lists that don't look like method calls. For example, it doesn't say that you can compare lists. It doesn't say that you can read and write elements in the lists. Would you automatically assume that those things aren't possible? I hope not. (Of course, those operations are handled by the magical methods __eq__, __setitem__, __getitem__ etc, but I think one can forgive the tutorial for not mentioning those in the interest of not confusing beginners.) By your logic, no web page would be allowed to say anything about lists unless it says *everything* about lists, and that wouldn't be very useful. As I just stated, I wasn't making a criticism of the page. But since you are defending it, let's talk about Python documentation from the perspective of an experienced programmer who is a new/casual user of both Python and Java. If I am in the process of writing a little Java program, java.sun.com provides documentation on its data structures that show up right at the top of a google search for Java ArrayList, Java Hashtable, etc. If I am writing a little Python program and want to see what I can do with a list, I google python list I get the tutorial page that has been mentioned. Then the next query result is a page that is titled the Python Language Reference. But in this reference page for python str,unicode,list,tuple,buffer,xrange, I see operators that work on lists and other data structures that I an mot concerned with, but there is no list of list methods. But I do see navigational arrows that I hopefully assume will take me to a page where I can find all the list methods - but that is not the case. I go from 3.6 Sequence Types -- str, unicode, list, tuple, buffer, xrange to 3.6.1 String Methods to 3.6.2 String Formatting Operations to 3.6.3 XRange Type to 3.6.4 Mutable Sequence Types. And then I'm done with 3.6 of the Python Language Reference and I never saw a list of list methods or a page devoted to lists. So I bounce out to the table of contents assuming that there must be an entry for list that will show all the list methods and operators and give me a summary ala Java ArrayList. But all I find are entries for UserList and AddressList. :( -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
On 8/30/07, Carsten Haese [EMAIL PROTECTED] wrote: Is the Pythonic way try: i = somelist.index(thing) # Do something with i except IndexError: # Do something if thing not found That is not the Pythonic way. # Do something with i might also raise an IndexError and they you are screwed. The Pythonic way is something like: try: i = somelist.index(thing) except IndexError: print Oh noes! else: # Do the thing with i And for many cases this actually is worse/less readable than the alternative would have been if list.index() returned -1. -- mvh Björn -- http://mail.python.org/mailman/listinfo/python-list
Re: reload(sys)
On Fri, 31 Aug 2007 12:53:36 +, Sönmez Kartal wrote:
On 31 A ustos, 04:24, Steven Bethard [EMAIL PROTECTED] wrote:
Snmez Kartal wrote:
I've had an encoding issue and solved it by
sys.setdefaultencoding('utf-8')...
My first try wasn't successful since setdefaultencoding is not named
when I imported sys module. After, I import sys module, I needed to
write reload(sys) also.
I wonder why we need to call reload(sys) to get setdefaultencoding
named?
sys.setdefaultencoding is purposely deleted from the sys module after
it's loaded because you really shouldn't be using it. The reload() call
restores the deleted attribute.
If you'd like a less brittle solution to your encoding issue, explain
what the issue was, and people here can probably help you find a better
solution.
I was using the XMLBuilder(xmlbuilder.py). I'm writing XML files as
f.write(str(xml)). At execution of that line, it gives error with
description, configure your default encoding...
This doesn't help us that much. What is `f` here and what is `xml`?
This is the part of xmlbuilder.py which raises the error.
try:
if self.pretty:
# tabs are evil, so we will use two spaces
outstr = self._dom.toprettyxml(
,encoding=self.encoding)
else:
outstr = self._dom.toxml(encoding=self.encoding)
except UnicodeDecodeError:
sys.stderr.write('Decoding Error: You must configure
default encoding\n')
sys.exit()
So there is an attribute `self.encoding` on that object. Is it set? What
encoding is it? And do you put byte strings with values outside ASCII
into your XML or unicode strings?
Ciao,
Marc 'BlackJack' Rintsch
--
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Re: create Powerpoint via com
How about chart creation (in Ppt 2003)? I do not see how to do this with Python. [EMAIL PROTECTED] wrote: You probably need to browse the COM object using PythonWin, which is a part of the ActiveState distro. You can also use Python's builtin function, dir, to find out various methods of COM. Here's some info in messing with charts in Excel, which should be similar to chart manipulation in PowerPoint. http://mail.python.org/pipermail/python-win32/2005-June/003511.html http://mail.python.org/pipermail/python-win32/2003-March/000839.html http://www.thescripts.com/forum/thread21565.html http://mathieu.fenniak.net/plotting-in-excel-through-pythoncom/ Thanks! Alan -- http://mail.python.org/mailman/listinfo/python-list
Re: fcntl problems
On 8/31/07, mhearne808 wrote:
I have a script that will be run from a cron job once a minute. One
of the things this script will do is open a file to stash some
temporary results. I expect that this script will always finish its
work in less than 15 seconds, but I didn't want to depend on that.
Thus I started to look into file locking, which I had hoped I could
use in the following fashion:
Process A opens file foo
Process A locks file foo
Process A takes more than a minute to do its work
Process B wakes up
Process B determines that file foo is locked
Process B quits in disgust
Process A finishes its work
That would look like (untested):
import fcntl, sys
f = open('foo', 'w+')
try:
fcntl.flock(f.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
except IOError, e:
if e.args[0] == 35:
sys.exit(1)
else:
raise
f.seek(0, 2) # seek to end
# do your thing with the file
f.flush()
fcntl.flock(f.fileno(), fcntl.LOCK_UN)
f.close()
-Miles
--
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Question involving a Python app...
I am a Flash developer (also a Python dev) and I use an editor called SEPY Actionscript Editor. The latest release version does not support Flash CS3, so I downloaded the source from subversion, edited it, and recompiled to get a version that worked with CS3. Right now, in order to run the program I have to do a command line python main.pyw. The question now is this: Others in my company would like to use the version I have compiled without installing Python, wxPython, 4suite, antlr, and a whole bunch of other Python libs. So, how do I create an executable (on Windows) to install the program so it will run without the aforementioned framework being installed? I know this isn't really an entirely Pythonic question, but this group has always been very helpful in the past. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Important Research Project
E.D.G. wrote: dave_w [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] My main Perl program is presently about 3500 lines of code long and 160 KB in size. So I am not too anxious to translate it into another language. Apparently, having painted himself into a corner, our warrior wants a few expert roofers to slither up and extricate him. One of the best experiences that a programmer can have is that of admitting that the lovingly nurtured brainchild is now terminally ill, and showing enough fortitude to make a fresh start. The problem I am having is largely with the mechanics of linking modules to the Perl compiler etc. So I am looking for experts who can help with cookbook instructions, start with step 1, step 2, step 3 etc. Experts saintly enough to salvage the possibly hopeless would some idea of whether they are being asked to donate their time to work on a fundamentally flawed design. With trying to find a chart program to use for example, there appear to be a number of them. But from examining their instructions it looks like most of them must also be linked to a third program called Gnuplot. And that increases the complexity of getting something running. Since Perl, as also most other general purpose languages, has no plotting primitives or intrinsics, you will have to use _some_ graphics protocol -- there is no escaping that. Gnuplot is by no means the only choice, but it is simple and provides a wide selection of output devices. Your Perl program can write the plot script to a file, and call Gnuplot to run that script. -- mecej4 -- http://mail.python.org/mailman/listinfo/python-list
Fatal Python error using ctypes python exceptions
Hi Everyone, I've created a 'C' dll that is accessed via ctypes library containing a bunch of functions. I've successfully been able to use the functions. However, I would like to throw python exceptions from some of them. I throw them using: ::PyErr_SetString(::PyExc_RuntimeError, theErrorString); I crash the console when this function is invoked in the 'C' domain. I get an error stating: Fatal Python error: PyThreadState_Get: no current thread when the calling code in python is: try: cdll.MyDll.ThrowingFunction() except: print An error has occurred The dll is just a plain win32 'C' dll, built with an MS compiler. How do I throw python exceptions correctly? Is there some kind of init function that needs to be called? Any help much appreciated. Thanks, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: Question involving a Python app...
On 8/31/07, sberry [EMAIL PROTECTED] wrote: So, how do I create an executable (on Windows) to install the program so it will run without the aforementioned framework being installed? Check out py2exe. -- Cheers, Simon B. [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: strings (dollar.cents) into floats
Ben Finney wrote: Wildemar Wildenburger [EMAIL PROTECTED] writes: But what use is there for floats, then? When is it OK to use them? When one is willing to sacrifice decimal precision for speed of calculation, and doesn't need the numbers to stay precise. E.g. when performing millions of calculations on real-world (analogue) measurements. Traditionally, mainframe computers used BCD arithmetic to handle currency, and the Decimal module is probably the best way to proceed if your Python is recent enough to include it. That isn't to say that currencies can't be handled using floating-point. The important thing then becomes to round after each calculation rather than allowing the errors to build up until they become significant enough to make a difference to the final result. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden --- Asciimercial -- Get on the web: Blog, lens and tag the Internet Many services currently offer free registration --- Thank You for Reading - -- http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb ImportError
Sjoerd wrote: Hello! When I try to import the MySQLdb lib python generates an error: Traceback (most recent call last): File pyshell#0, line 1, in module import MySQLdb File C:\Python25\lib\site-packages\MySQLdb\__init__.py, line 19, in module import _mysql ImportError: DLL load failed with error code 193 This is on a AMD64 bit machine, when I import it on a 32 bit machine it works fine. Is there anyway to fix this? Is there a build for AMD64 bit machines or is there simply no way that I can get MySQLdb working on it? Thanks in advance, Sjoerd I'm not aware of a current build for that architecture (and your assumption that the load fails because of the architecture mismatch is correct). It is possible to build the module yourself if it's important enough. I remember doing this some time ago with the Microsoft free compiler kit, for example. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden --- Asciimercial -- Get on the web: Blog, lens and tag the Internet Many services currently offer free registration --- Thank You for Reading - -- http://mail.python.org/mailman/listinfo/python-list
Re: Setting a read-only attribute
[EMAIL PROTECTED] wrote: I have an object and wish to set an attribute on it which, unfortunately for me, is read-only. How can I go about this? This seems like a bizarre requirement. Why is the attribute read-only in the first place? How is the read-only mechanism enforced? Is the object created in Python or in an extension module? Do you have any evidence that setting the attribute will effect the required change in the behavior of the object. A little more information would be helpful. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden --- Asciimercial -- Get on the web: Blog, lens and tag the Internet Many services currently offer free registration --- Thank You for Reading - -- http://mail.python.org/mailman/listinfo/python-list
Re: fcntl problems
mhearne808[insert-at-sign-here]gmail[insert-dot-here]com [EMAIL PROTECTED] writes: I think I'm still confused. What Miles tried to tell you is that you should call fcnt.flock from both PA and PB. In the example you posted, you failed to call it from PB. No lock call, so no locking happened. I have a script that will be run from a cron job once a minute. One of the things this script will do is open a file to stash some temporary results. I expect that this script will always finish its work in less than 15 seconds, but I didn't want to depend on that. Thus I started to look into file locking, which I had hoped I could use in the following fashion: Process A opens file foo Process A locks file foo Process A takes more than a minute to do its work Process B wakes up Process B determines that file foo is locked Process B quits in disgust Process A finishes its work File locking supports that scenario, as you suspected. You need to use flock with LOCK_EX|LOCK_NB. If the call succeeds, you got the lock. If you get an exception whose errno is EWOULDBLOCK, you quit in disgust. -- http://mail.python.org/mailman/listinfo/python-list
Re: fcntl problems
On Aug 31, 8:42 am, Miles [EMAIL PROTECTED] wrote:
On 8/31/07, mhearne808 wrote:
I have a script that will be run from a cron job once a minute. One
of the things this script will do is open a file to stash some
temporary results. I expect that this script will always finish its
work in less than 15 seconds, but I didn't want to depend on that.
Thus I started to look into file locking, which I had hoped I could
use in the following fashion:
Process A opens file foo
Process A locks file foo
Process A takes more than a minute to do its work
Process B wakes up
Process B determines that file foo is locked
Process B quits in disgust
Process A finishes its work
That would look like (untested):
importfcntl, sys
f = open('foo', 'w+')
try:
fcntl.flock(f.fileno(),fcntl.LOCK_EX |fcntl.LOCK_NB)
except IOError, e:
if e.args[0] == 35:
sys.exit(1)
else:
raise
f.seek(0, 2) # seek to end
# do your thing with the file
f.flush()fcntl.flock(f.fileno(),fcntl.LOCK_UN)
f.close()
-Miles
I tested that, and it works! Thanks!
Looking at my flock(3) man page, I'm guessing that 35 is the error
code for EWOULDBLOCK. Which system header file am I supposed to look
in to figure that magic number out?
I would make the argument that this module could be either more
pythonic, or simply documented more completely. The open source
response, of course, would be go for it!.
--Mike
--
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Re: Biased random?
Robert Kern wrote: Ivan Voras wrote: Jeffrey Barish wrote: If you take the difference between two uniformly distributed random variables, the probability density function forms an isosceles triangle centered at 0. Take the absolute value of that variable and the pdf is a straight line with maximum value at 0 tapering to 0 at max. Thus, z = abs(randint(0, max) - randint(0, max)) ought to do the trick. It's elegant :) I've noticed something interesting in my test: the value 0 appears less often than other values (which behave as they should). The distribution of the difference (before the abs()) looks like this (max=4): # ### # ### ---0+++ 321 123 Taking the absolute value doubles up the non-zero masses, but there's no negative 0 to add to the 0s stack. # # ### ### 0123 The method does not work because of that. The math says that it works, so we must not be implementing it correctly. I suspect that our mistake is quantizing the random variable first and then taking the difference and absolute value. What result do you get when you quantize once? That is, obtain two random values (floats) with uniform pdf. Take the difference. Abs. Round to int. This way, everything in the band from (-0.5, +0.5) goes to 0, and that's the highest part of the triangle. -- Jeffrey Barish -- http://mail.python.org/mailman/listinfo/python-list
Re: Question involving a Python app...
On Aug 31, 9:52 am, sberry [EMAIL PROTECTED] wrote: I am a Flash developer (also a Python dev) and I use an editor called SEPY Actionscript Editor. The latest release version does not support Flash CS3, so I downloaded the source from subversion, edited it, and recompiled to get a version that worked with CS3. Right now, in order to run the program I have to do a command line python main.pyw. The question now is this: Others in my company would like to use the version I have compiled without installing Python, wxPython, 4suite, antlr, and a whole bunch of other Python libs. So, how do I create an executable (on Windows) to install the program so it will run without the aforementioned framework being installed? I know this isn't really an entirely Pythonic question, but this group has always been very helpful in the past. Thanks I find GUI2exe to be very easy to use. It's just py2exe with a GUI frontend. See http://xoomer.alice.it/infinity77/main/GUI2Exe.html for more information. Mike -- http://mail.python.org/mailman/listinfo/python-list
RE: win32com problem: more than one instance
Hello Thomas, excel registers its COM objects with REGCLS_SINGLEUSE that means one COM object is created per process. In Solidworks it seems that that they register with REGCLS_MULTIPLEUSE, which means on process can serve more than one COM object. Hence you have no chance to get multiple instances running in any COM client. Stefan -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Golden Sent: Friday, August 31, 2007 1:36 PM To: Thomas Rademacher Cc: python-list@python.org Subject: Re: win32com problem: more than one instance Thomas Rademacher wrote: Hello, I start my script convert.py simultaneously in any dos-shells several times. But I get every time the same solidworks instance. I see in the proccess (task) manager only one solidworks.exe Therefore I get for all simultaneous conversions the same output file. I *think* -- and I'm really hoping someone more knowledgeable can chip in here -- that it's down to the particular COM object implementation. ie Excel may choose to offer you separate instances (or whatever they're called) while SolidWorks may not. TJG -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Ayuda
Gente Inteligente y Distinguida, soy un aficionado y apelo a Ustedes, para resolver éste problema. Para WebMaster de Google, me solicita instalar o ejecución de pitón, cómo comprenderán no dispongo de ningún guru de web, por lo que solicito en la medida de sus posibilidades me ayuden a ejecutar pitón para WebMaster, para ingresar a sitemap.xlm. Les saludo con distinguida consideración y respeto. José Si son tan amables, les agradeceré cualquiera sea la Repuesta, en Español o castellano. Gracias -- http://mail.python.org/mailman/listinfo/python-list
Re: fcntl problems
On 8/31/07, mhearne808 wrote: Looking at my flock(3) man page, I'm guessing that 35 is the error code for EWOULDBLOCK. Which system header file am I supposed to look in to figure that magic number out? I got the error number by looking at the IOError exception raised when playing with the interactive interpreter, but I really should have written: from errno import EWOULDBLOCK ... if e.args[0] == EWOULDBLOCK: ... - Miles -- http://mail.python.org/mailman/listinfo/python-list
Re: Setting a read-only attribute
On Aug 31, 6:14 pm, Alexandre Badez [EMAIL PROTECTED] wrote:
On Aug 30, 11:35 pm, [EMAIL PROTECTED] [EMAIL PROTECTED]
wrote:
I have an object and wish to set an attribute on it which,
unfortunately for me, is read-only.
How can I go about this?
Cheers.
-T
Could you show the object you want to set his attribute?
Until that, it's difficult to answer to you.
PS: If the attribut is on read only, their must a good reason for
that ;)
Hi all,
Thanks for all the responses. What I'm trying to do is kludge around
something. sys.settrace takes a method whose arguments are (frame,
event, arg). I want to have a tracer class which can be instantiated
and listen in on these trace calls.
Another way to go about it *might* be to have a module-level list of
registered Tracer objects which a module-level trace method informs of
events. It would probably be easier. In fact, I'll go do that.
*That said*, I still think it makes sense to be able to have objects
register with sys.settrace.
So what I did then was declare a static method with the same pattern
expected by sys.settrace. I then want to use something like __dict__
or __setattr__ to give that method a reference to the owning object.
And this is what I'm trying to do -- declare a static method, then un-
static it by adding a reference to the callable object...
Here's some code:
import sys
class Tracer:
'''
Instantiate this in order to access program trace information.
'''
def _getcallback(self):
@staticmethod
def callback(frame, event, arg):
print tracing ..., tracerReference
#print line , frame.f_lineno, frame.f_locals
return callback
def startTrace(self):
callback = self._getcallback()
callback.__dict__['tracerReference'] = self
sys.settrace(callback)
def foo(dict):
for i in range(2):
pass
if __name__ == __main__:
t = Tracer()
t.startTrace()
foo({1 : 5})
--
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Do you have any complete example for creating msi file(doing file copying)
Thank you for the help that you are going to give me. I have a project where in which i want to create a msi file just as python-package while installing python on the system. Just copying the files to the user given target directory. i want to create similar msi file for my project that just copies the file. Can you please help me in providing the complete procedure of creating the msi file using the python. Does msilib library in the release 2.5 have this capability? Please help me Thanks Sid Unlimited freedom, unlimited storage. Get it now, on http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html/-- http://mail.python.org/mailman/listinfo/python-list
Re: strings (dollar.cents) into floats
On 31 Aug, 02:12, Wildemar Wildenburger [EMAIL PROTECTED] wrote: I've heard (ok, read) that several times now and I understand the argument. But what use is there for floats, then? When is it OK to use them? There are fractions that can be exactly represented by floats that cannot be exactly represented by decimals. There are fractions that can be exactly represented by decimals that cannot be exactly represented by floats. Which one is better? Which do we prefer? What a float cannot do is to represent a decimal fractional number (e.g. 1.1) exactly. If we need that, we cannot use floats. A notable example is monetary computations, it covers 99% of the use for decimal numbers in computers. For this reason, we should never use floats to add 10 cents to a dollar. The use of decimals for monetary calculations is mandatory. Floats are written as decimal fractional numbers in program code, and they are printed as decimal fractional numbers on the screen. A novice programmer may for this reason easily mistake floats for being decimals. But inside the computer floats are something very different. Floats do not represent decimal fractional numbers. Floats represent binary fractional numbers. Decimal numbers are base-10, binary numbers are base-2. Floats and decimals are similar but different. It is much easier to manipulate for computers than decimals. Digital electronics by convention only has two states, TTL voltage levels 0.0 V and 5.0 V, which are taken to mean 0 and 1 in binary (or false and true in boolean) respectively. Computers work internally with binary numbers. Floats are preferred to decimals in e.g. numerical maths and other scientific computing for their better performance speed wise. Knowledge of the behaviour of floats, e.g. how they cause rounding and truncation errors, is pivotal in that field of computer science. For most purposes, we could replace floats with decimals. But then we would suffer a major speed penalty. Decimals are only precise if the input values can be represented precisely by decimal fractions. If we typed 1.1 and took that to mean one dollar and 10 cents, then certainly exactly 1.1 was what we meant. But if we ment 1.1 centigrades read from a mercury thermometer, we would actually (by convention) mean something between 1.05 and 1.14 centigrades. Decimals also fail to be exact if we try to compute things like 1.0/3.0. 1/3 does not have an exact representation in decimal, and we get an approximation from the computer. For purposes where exact precision is not needed, decimals are neither better nor worse than floats. This accounts for 99% of the cases where fractional numbers are used on a computer. More about floating point numbers here: http://www.math.byu.edu/~schow/work/IEEEFloatingPoint.htm Sturla Molden -- http://mail.python.org/mailman/listinfo/python-list
escaping only double quotes
Hi, I have a string which is constructed like this: string = Butler's 15\ TV s = my string goes here %s % string the single string, unfortunately, gets escaped which is something I want to avoid because I have to load the data into a database using the json format and I get an invalid escape error if the single quote is escaped. Is there a way to accomplish this? Thanks and regards Francesco -- http://mail.python.org/mailman/listinfo/python-list
Re: Question involving a Python app...
On Aug 31, 8:25 am, [EMAIL PROTECTED] wrote: On Aug 31, 9:52 am, sberry [EMAIL PROTECTED] wrote: I am a Flash developer (also a Python dev) and I use an editor called SEPY Actionscript Editor. The latest release version does not support Flash CS3, so I downloaded the source from subversion, edited it, and recompiled to get a version that worked with CS3. Right now, in order to run the program I have to do a command line python main.pyw. The question now is this: Others in my company would like to use the version I have compiled without installing Python, wxPython, 4suite, antlr, and a whole bunch of other Python libs. So, how do I create an executable (on Windows) to install the program so it will run without the aforementioned framework being installed? I know this isn't really an entirely Pythonic question, but this group has always been very helpful in the past. Thanks I find GUI2exe to be very easy to use. It's just py2exe with a GUI frontend. Seehttp://xoomer.alice.it/infinity77/main/GUI2Exe.htmlfor more information. Mike Thanks for the help... and for giving it so quickly - I can always count on this group. Problems though... I was successful at creating the dist dir with my executable file, but when I try to run it I get an error.log file with the following: type 'exceptions.IOError' [Errno 9] Bad file descriptor [53]: main.pyw [29]: SEPY.pyo [16]: core\__init__.pyo [5]: core\documents\__init__.pyo [11]: core\documents\compare.pyo [15]: core\documents\editor.pyo [13]: core\io\__init__.pyo [6]: core\io\xml\__init__.pyo [11]: core\io\xml\autoformat.pyo [29]: Ft\Xml\Domlette.pyo [355]: Ft\Xml\InputSource.pyo [584]: Ft\Xml\Catalog.pyo [62]: warnings.pyo [126]: warnings.pyo [122]: Ft\__init__.pyo Can anyone help explain what I am missing here? THANKS! -- http://mail.python.org/mailman/listinfo/python-list
Looking for Delaunay triangulation module...
Can anybody point me to a Delaunay triangulation module (for Win32)? I'm currently using http://flub.stuffwillmade.org/delny/ under Linux, but I have been unable to find a build for Windows. I don't have the tools (or skills) to build libqhull and Pythion extensions on Win32). I've also found the delaunay module in scipy's sandbox. I could never get that module to work under Linux, and I can't build it for Windows anyway. So for lack of a delaunay module, I'm stuck trying to port my application to Win32. I've spent some time Googling and found various references to pur Python delaunay modules that were abandoned because they were slow (though I haven't been able to find any of the actual modules). Slow is better than none. ;) -- Grant Edwards grante Yow! An air of FRENCH FRIES at permeates my nostrils!! visi.com -- http://mail.python.org/mailman/listinfo/python-list
So what exactly is a complex number?
Like in math where you put letters that represent numbers for place holders to try to find the answer type complex numbers? -- http://mail.python.org/mailman/listinfo/python-list
JavaScript
Guys, anybody know if is possible to press a button linked a javascript function using python? My Firefox send something like that: POST /msgs.aspx TOKEN=B8B83BGDBC191B9FE0A0BE1393294FABsig=gpaiOqbp0Nr %2BoecRLF4FGGDOAao %3DtoUserId=1331299rawAddedDate=118854fromUserId=23029Action.delete=Send +data python has modules for forms and other things... and for it? Thank you for help... zowtar -- http://mail.python.org/mailman/listinfo/python-list
Re: Fatal Python error using ctypes python exceptions
mmacrobert schrieb: Hi Everyone, I've created a 'C' dll that is accessed via ctypes library containing a bunch of functions. I've successfully been able to use the functions. However, I would like to throw python exceptions from some of them. I throw them using: ::PyErr_SetString(::PyExc_RuntimeError, theErrorString); I crash the console when this function is invoked in the 'C' domain. I get an error stating: Fatal Python error: PyThreadState_Get: no current thread when the calling code in python is: try: cdll.MyDll.ThrowingFunction() except: print An error has occurred The dll is just a plain win32 'C' dll, built with an MS compiler. How do I throw python exceptions correctly? Is there some kind of init function that needs to be called? For libraries loaded with cdll.MyDll or CDLL(MyDll) ctypes releases the GIL before calling the function, and reacquires the GIL afterwards. This has the consequence that you cannot use any Python api functions inside the dll functions (because there is no ThreadState, just like the error message says). If you want to throw Python exceptions in the dlls functions, or use other Python apis, you must use the 'Python calling convention'. For this calling convention the GIL is NOT released and reacquired, but after the function call returns PyErr_Occurred() is called and an exception raised in the calling code - exactly what you want. The 'Python calling convention' is used when you load the library with pydll.MyDll or PyDLL(MyDll). Additional remark: You can have functions with different calling conventions in the same dll, just load it with different library loaders and you're fine. Thomas -- http://mail.python.org/mailman/listinfo/python-list
Re: status of Programming by Contract (PEP 316)?
Paul Rubin http://[EMAIL PROTECTED] wrote: ... Hi Alex, I'm a little confused: does Production Systems mean stuff like the Google search engine, which (as you described further up in your message) achieves its reliability at least partly by massive redundancy and failover when something breaks? The infrastructure supporting that engine (and other things), yes. In that case why is it so important that the software be highly reliable? Is a software Think common-mode failures: if a program has a bug, so do all identical copies of that program. Redundancy works for cheap hardware because the latter's unreliability is essentially free of common-mode failures (when properly deployed): it wouldn't work against a design mistake in the hardware units. Think of the famous Pentium division bug: no matter how many redundant but identical such buggy CPUs you place in parallel to compute divisions, in the error cases they'll all produce the same wrong results. Software bugs generally work (or, rather, fail to work;-) similarly to hardware design bugs. There are (for both hw and sw) also classes of mistakes that don't quite behave that way -- occasional glitches that are not necessarily repeatable and are heavily state-dependent (race conditions in buggy multitasking SW, for example; and many more examples for HW, where flaky behavior may be triggered by, say, temperature situations). Here, from a systems viewpoint, you might have a system that _usually_ says that 10/2 is 5, but once in a while says it's 4 instead (as opposed to the Pentium division bug case where it would always say 4) -- this is much more likely to be caused by flaky HW, but might possibly be caused by the SW running on it (or the microcode in between -- not that it makes much of a difference one way or another from a systems viewpoint). Catching such issues can, again, benefit from redundancy (and monitoring, watchdog systems, health and sanity checks running in the background, c). Quis custodiet custodes is an interesting problem here, since bugs or flakiness in the monitoring/watchdog infrastructure have the potential to do substantial global harm; one approach is to invest in giving that infrastructure an order of magnitude more reliability than the systems it's overseeing (for example by using more massive and *simple* redundancy, and extremely straightforward architectures). There's ample literature in the matter, but it absolutely needs a *systems* approach: focusing just on the HW, just on the SW, or just on the microcode in-between;-), just can't help much. some good hits they should display) but the server is never actually down, can you still claim 100% uptime? I've claimed nothing (since all such measurements and methodologies would no doubt be considered confidential unless and until cleared for publication -- this has been done for a few whitepapers about some aspects of Google's systems, but never to the best of my knowledge for the metasystem as a whole), but rather pointed to http://uptime.pingdom.com/site/month_summary/site_name/www.google.com, a publically available site which does publish its methodology (at http://uptime.pingdom.com/general/methodology); summarizing, as they have no way to check that the results are right for the many sites they keep an eye on, they rely on the HTTP result codes (as well as validity of HTTP headers returned, and of course whether the site does return a response at all). problem. Of course then there's a second level system to manage the restarts that has to be very reliable, but it doesn't have to deal with much weird concocted input the way that a public-facing internet application has to. Indeed, Production Systems' software does *not* have to deal with input from the general public -- it's infrastructure, not user-facing applications (except in as much as the users are Google engineers or operators, say). IOW, it's *exactly* the code that has to be very reliable (nice to see that we agree on this;-), and therefore, if as you then said Russ's point stands, would NOT be in Python -- but it is. So, I disagree about the standing status of his so-called point. Therefore I think Russ's point stands, that we're talking about a different sort of reliability in these highly redundant systems, than in the systems Russ is describing. Russ specifically mentioned *mission-critical applications* as being outside of Python's possibilities; yet search IS mission critical to Google. Yes, reliability is obtained via a systems approach, considering HW, microcode, SW, and other issues yet such as power supplies, cooling units, network cables, etc, not as a single opaque big box but as an articulated, extremely complex and large system that needs testing, monitoring, watchdogging, etc, at many levels -- there is no other real way to make systems reliable (you can't do it by just looking at components in isolation). Note that this does have costs and therefore it needs to be
Re: status of Programming by Contract (PEP 316)?
Michele Simionato [EMAIL PROTECTED] wrote: ... I would not call that an attack. If you want to see an attack, wait for Alex replying to you observations about the low quality of code at Google! ;) I'm not going to deny that Google Groups has glitches, particularly in its user interface (that's why I'm using MacSOUP instead, even though Groups, were it perfect, would offer me a lot of convenience). We have a LOT of products (see http://www.google.com/intl/en/options/index.html, plus a few more at http://labs.google.com/; http://en.wikipedia.org/wiki/List_of_Google_products for an overview, http://searchengineland.com/070220-091136.php for a list of more lists...), arguably too many in the light of the It's best to do one thing really, really well ``thing we've found to be true''; given the 70-20-10 rule we use (we spend 70% of our resources on search and ads [and of course infrastructure supporting those;-)], 20% on adjacent businesses such as News, Desktop and Maps, 10% on all the rest combined), products in the other (10%) category may simply not receive sufficient time, resources and attention. We've recently officially raised Apps to the status of a third pillar for Google (after Search and Ads), but I don't know which of our many products are officially within these pillar-level Apps -- maybe a good starting hint is what's currently included in the Premier Edition of Google Apps, i.e.: Gmail (with 99.9% uptime guarantee), Google Talk, Google Calendar, Docs Spreadsheets, Page Creator and Start Page. I do notice that Google Groups is currently not in that elite (but then, neither are other products we also offer in for-pay editions, such as Google Earth and Sketchup) but I have no insider information as to what this means or portends for the future (of course not: if I _did_ have insider information, I could not talk about the subject!-). Notice, however, that none of these points depend on use of Python vs (or side by side with) other programming languages, DbC vs (or side by side with) other methodologies, and other such technical and technological issues: rather, these are strategical problems in the optimal allocation of resources that (no matter how abundant they may look on the outside) are always scarce compared to the bazillion ways in which they _could_ be employed -- engineers' time and attention, machines and networking infrastructure, and so forth. Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: list index()
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote: ... Why wouldn't the one obvious way be: def inAnotB(A, B): inA = set(os.listdir(A)) inBs = set(os.listdir(B)) return inA.difference(inBs) If you want a set as the result, that's one possibility (although possibly a bit wasteful as you're building one more set than necessary); I read the original request as implying a sorted list result is wanted, just like os.listdir returns (possibly sorted in case-independent order depending on the underlying filesystem). There's no real added value in destroying inA's ordering by making it a set, when the list comprehension just naturally keeps its ordering. Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: So what exactly is a complex number?
On Thu, 2007-08-30 at 20:11 -0500, Lamonte Harris wrote: Like in math where you put letters that represent numbers for place holders to try to find the answer type complex numbers? Is English your native language? I'm having a hard time decoding your question. -- Carsten Haese http://informixdb.sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list
Complex Numbers
-- Forwarded message -- From: Lamonte Harris [EMAIL PROTECTED] To: python-list@python.org Date: Thu, 30 Aug 2007 20:11:14 -0500 Subject: So what exactly is a complex number? Like in math where you put letters that represent numbers for place holders to try to find the answer type complex numbers? Not quite. Consider the square root of -1. It's not real because you can't square a real number and get a negative, so we define i (or, perhaps j) to be the square root of -1. An imaginary number is of the form Ai, where A is real. So 2i, -3.14i are imaginary. Complex Numbers are of the form A + Bi Where A and B are real (so they have a real component and am imaginary component). So yo might see 2 + 3i, etc. You'll see them a lot in engineering. -- http://mail.python.org/mailman/listinfo/python-list
Re: strings (dollar.cents) into floats
sturlamolden wrote: On 31 Aug, 02:12, Wildemar Wildenburger [EMAIL PROTECTED] wrote: I've heard (ok, read) that several times now and I understand the argument. But what use is there for floats, then? When is it OK to use them? There are fractions that can be exactly represented by floats that cannot be exactly represented by decimals. Would you care to give an example? There are fractions that can be exactly represented by decimals that cannot be exactly represented by floats. Which one is better? Which do we prefer? What a float cannot do is to represent a decimal fractional number (e.g. 1.1) exactly. If we need that, we cannot use floats. A notable example is monetary computations, it covers 99% of the use for decimal numbers in computers. For this reason, we should never use floats to add 10 cents to a dollar. The use of decimals for monetary calculations is mandatory. That last sentence is patent nonsense, and completely untrue. Many satisfactory financial applications have been written using only floating-point arithmetic. Indeed I believe the accountant's Swiss army knife, the Excel spreadsheet, uses floating-point numbers exclusively. What you say about floating-point have speed advantages is true, but you go too far in claiming that decimal arithmetic is mandatory for monetary calculations. That's about as sensible as saying that base 12 and base 20 arithmetic units were required to calculate in pounds, shillings and pence. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden --- Asciimercial -- Get on the web: Blog, lens and tag the Internet Many services currently offer free registration --- Thank You for Reading - -- http://mail.python.org/mailman/listinfo/python-list
Re: So what exactly is a complex number?
On 8/31/07, Carsten Haese [EMAIL PROTECTED] wrote: On Thu, 2007-08-30 at 20:11 -0500, Lamonte Harris wrote: Like in math where you put letters that represent numbers for place holders to try to find the answer type complex numbers? Is English your native language? I'm having a hard time decoding your question. I'm pretty sure he was describing middle school algebra. -- http://mail.python.org/mailman/listinfo/python-list
Re: Setting a read-only attribute
[EMAIL PROTECTED] wrote:
On Aug 31, 6:14 pm, Alexandre Badez [EMAIL PROTECTED] wrote:
On Aug 30, 11:35 pm, [EMAIL PROTECTED] [EMAIL PROTECTED]
wrote:
I have an object and wish to set an attribute on it which,
unfortunately for me, is read-only.
How can I go about this?
Cheers.
-T
Could you show the object you want to set his attribute?
Until that, it's difficult to answer to you.
PS: If the attribut is on read only, their must a good reason for
that ;)
Hi all,
Thanks for all the responses. What I'm trying to do is kludge around
something. sys.settrace takes a method whose arguments are (frame,
event, arg). I want to have a tracer class which can be instantiated
and listen in on these trace calls.
Another way to go about it *might* be to have a module-level list of
registered Tracer objects which a module-level trace method informs of
events. It would probably be easier. In fact, I'll go do that.
*That said*, I still think it makes sense to be able to have objects
register with sys.settrace.
So what I did then was declare a static method with the same pattern
expected by sys.settrace. I then want to use something like __dict__
or __setattr__ to give that method a reference to the owning object.
And this is what I'm trying to do -- declare a static method, then un-
static it by adding a reference to the callable object...
Here's some code:
import sys
class Tracer:
'''
Instantiate this in order to access program trace information.
'''
def _getcallback(self):
@staticmethod
def callback(frame, event, arg):
print tracing ..., tracerReference
#print line , frame.f_lineno, frame.f_locals
return callback
def startTrace(self):
callback = self._getcallback()
callback.__dict__['tracerReference'] = self
sys.settrace(callback)
def foo(dict):
for i in range(2):
pass
if __name__ == __main__:
t = Tracer()
t.startTrace()
foo({1 : 5})
Surely the thing to do, if I understand you, is to declare callback as a
standard method and then pass a reference to a bound method (the most
obvious candidate being self.callback) to sys.settrace().
[EMAIL PROTECTED] ~/Projects/Python
$ cat test05.py
import sys
class Tracer:
'''
Instantiate this in order to access program trace information.
'''
def callback(self, frame, event, arg):
print tracing ..., self
print line , frame.f_lineno, frame.f_locals
def startTrace(self):
sys.settrace(self.callback)
def foo(dict):
for i in range(2):
pass
if __name__ == __main__:
t = Tracer()
t.startTrace()
foo({1 : 5})
[EMAIL PROTECTED] ~/Projects/Python
$ python test05.py
tracing ... __main__.Tracer instance at 0x7ff2514c
line 19 {'dict': {1: 5}}
[EMAIL PROTECTED] ~/Projects/Python
$
Does this do what you want?
regards
Steve
--
Steve Holden+1 571 484 6266 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://del.icio.us/steve.holden
--- Asciimercial --
Get on the web: Blog, lens and tag the Internet
Many services currently offer free registration
--- Thank You for Reading -
--
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Re: status of Programming by Contract (PEP 316)?
Russ wrote: I've always wondered... Are the compilers (or interpreters), which take these programs to machine code, also formally proven correct? No, they are not formally proven correct (too complicated for that), but I believe they are certified to a higher level than your typical compiler. I think that Ada compilers used for certain safety-critical applications must meet higher standards than, say, GNU Ada, for example. And the OS in which those programs operate, are they also formally proven correct? Same as above, if I am not mistaken. And the hardware, microprocessor, electric supply, etc. are they also 'proven correct'? I think the microprocessors used for flight control, for example, are certified to a higher level than standard microprocessors. How would you prove a power supply to be correct? I'm sure they meet higher reliability standards too. ... I believe ..., ... if I am not mistaken, I think Well, all this certainty you are expressing will surely allow this bozo to sleep more soundly in his bed. Frankly I am getting a little tired of they way you are unable to even recognize that your readers may well have a sensible appreciation of the difficulties about which you write. As has been pointed out already, many readers here are extremely experienced programmers. You said in an earlier post that's not an insult, but that isn't really up to you to decide. If it gives offense then it probably is, whether it was intended to do so or not. You don't seem to appreciate the insulting nature of your tone, and calling people bozos is not likely to endear you to most c.l.py readers since it comes off as arrogant. Given that you now profess no absolute certainty on fairly simple matters connected to safety-critical systems I wish you'd step down off your platform and join the rest of us. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden --- Asciimercial -- Get on the web: Blog, lens and tag the Internet Many services currently offer free registration --- Thank You for Reading - -- http://mail.python.org/mailman/listinfo/python-list
Re: strings (dollar.cents) into floats
On 8/31/07, Steve Holden [EMAIL PROTECTED] wrote: sturlamolden wrote: On 31 Aug, 02:12, Wildemar Wildenburger [EMAIL PROTECTED] wrote: I've heard (ok, read) that several times now and I understand the argument. But what use is there for floats, then? When is it OK to use them? There are fractions that can be exactly represented by floats that cannot be exactly represented by decimals. Would you care to give an example? There are fractions that can be exactly represented by decimals that cannot be exactly represented by floats. Which one is better? Which do we prefer? What a float cannot do is to represent a decimal fractional number (e.g. 1.1) exactly. If we need that, we cannot use floats. A notable example is monetary computations, it covers 99% of the use for decimal numbers in computers. For this reason, we should never use floats to add 10 cents to a dollar. The use of decimals for monetary calculations is mandatory. That last sentence is patent nonsense, and completely untrue. Many satisfactory financial applications have been written using only floating-point arithmetic. Indeed I believe the accountant's Swiss army knife, the Excel spreadsheet, uses floating-point numbers exclusively. This is true, although Excel munges it's FP to provide expected results. It depends on what you consider a financial application though. Excel, while in extremely broad use, is not used to implement any of the systems which actually define money, like the back end financial systems at banks and credit unions. In my experience, by far the most common method of calculating financial numbers is actually using integer amounts, and then applying well-defined rounding rules which I can't be bothered to look up the name for. For what it's worth, the work that I do with money (which is middleware doing data transport, not calculations or billing) uses either string representations or fixed point. What you say about floating-point have speed advantages is true, but you go too far in claiming that decimal arithmetic is mandatory for monetary calculations. That's about as sensible as saying that base 12 and base 20 arithmetic units were required to calculate in pounds, shillings and pence. I believe that to the degree that real accounting was done in those currencies it did in fact use non-decimal bases. Just as people don't use decimal time values (except us crazy computer folk), you're write 1 pound 4 shillings, not 1.333... pounds. -- http://mail.python.org/mailman/listinfo/python-list
Re: escaping only double quotes
string = Butler's 15\ TV s = my string goes here %s % string Couldn't find anything wrong in string = Butler's 15\ TV s = my string goes here %s % string -- http://mail.python.org/mailman/listinfo/python-list
Re: escaping only double quotes
You could write a simple escape function.
def escape(html):
Return the given TEXT with ampersands, quotes and carets
encoded.
return html.replace('', 'amp;').replace('',
'lt;').replace('', 'gt;').replace('', 'quot;').replace(',
'#39;')
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Re: JavaScript
python has modules for forms and other things... and for it? Check out httplib and urlib2, it might be useful for you. -- http://mail.python.org/mailman/listinfo/python-list
Is there a simple way to exit a while loop on keystroke?
I am new to python, and have written a simple program to read a port via telnet. I would like it to run until any key is pressed. Of course I wouldn't mind requiring a specific keystroke in the future, but I would think this is simpler for now. I have used kbhit() and getch() many times in C, but I can't find anything similar in Python. I am using Linux also, so the msvcrt code isn't an option. I have tried sys.stdin.read(), but that hangs UNTIL a key is pressed. Thanks -- http://mail.python.org/mailman/listinfo/python-list
platform system may be Windows or Microsoft since Vista
Let's suppose you get Python for Vista Windows today from
http://www.python.org/download/.
Should you then conclude that the tests:
if platform.system() in ('Windows', 'Microsoft'):
if not (platform.system() in ('Windows', 'Microsoft')):
are now exactly what you should write for that 2.5.1 Python, when you
must resort to os-specific tools like DeviceIoControl, in place of the
slightly simpler tests that worked before:
if platform.system() == 'Windows': # Microsoft
if platform.system() != 'Windows': # Microsoft
?
Curiously yours, thanks in advance,
P.S. Groups search assures me clp hasn't previously reviewed: platform
system Windows Microsoft
P.P.S. I ask because this August I rediscovered this 28 May Python
uname vs. Win kernel32.getVersionEx issue indexed by Google as
follows:
http://mail.python.org/pipermail/patches/2007-June/022947.html
...
Patches item #1726668, was opened at 2007-05-28 03:23
On Microsoft Vista platform.system() returns 'Microsoft' and
platform.release() returns 'Windows'
Under Microsoft Windows XP SP2 platform.system() returns 'Windows' and
platform.release() returns 'XP'.
This is problem was caused by a change in the output of the ver
command. In Windows XP SP2 ver outputted 'Microsoft Windows XP
[Version 5.1.2600]' In Microsoft Vista ver outputted 'Microsoft
Windows [Version 6.0.6000]'. The lack of the 3rd word before version
causes _syscmd_ver(...) in platform.py to return 'Microsoft' for
system instead of 'Microsoft Windows'. This causes uname() to return
the incorrect values. Both system() and release() call uname().
...
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