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• Handle mysql restart in SQLAlchemy

  - by wRAR

  My Pylons app uses local MySQL server via SQLAlchemy and python-MySQLdb. When the server is restarted, open pooled connections are apparently closed, but the application doesn't know about this and apparently when it tries to use such connection it receives "MySQL server has gone away": File '/usr/lib/pymodules/python2.6/sqlalchemy/engine/default.py', line 277 in do_execute cursor.execute(statement, parameters) File '/usr/lib/pymodules/python2.6/MySQLdb/cursors.py', line 166 in execute self.errorhandler(self, exc, value) File '/usr/lib/pymodules/python2.6/MySQLdb/connections.py', line 35 in defaulterrorhandler raise errorclass, errorvalue OperationalError: (OperationalError) (2006, 'MySQL server has gone away') This exception is not caught anywhere so it bubbles up to the user. If I should handle this exception somewhere in my code, please show the place for such code in a Pylons WSGI app. Or maybe there is a solution in SA itself?

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• Eclipse users: Do you use Aptana too?

  - by Glenn

  This San Mateo development company makes a freely downloadable convenient packaging of many plugins for Eclipse called Aptana. I was recently in an environment where Aptana came pre-installed. Not only is it a good IDE for RoR, it also does a somewhat decent job (sans debugging) for PHP, Python, HTML, CSS, and Javascript. According to their own web site, their IDE also supports Adobe Air and the iPhone. If you are currently using Eclipse, then do you also use Aptana too? What, if any, are the drawbacks to using Aptana?

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• Where can I find the gtk-builder-convert script?

  - by Marty

  I've built a small GUI app for work that uses some .glade files for pop-up windows. Recently, the ground beneath me was shifted - my environment was upgraded. Newer pyGTK versions require GTKBuilder and .xml files instead of Glade and .glade files and now my poor app is broken. I need to convert the .glade file to the newer .xml file. Problem is Glade-3 is not on our system, and I can't find gtk-builder-convert on the web. I've looked at the Gnome GIT Browser, don't know where to start looking or how to search it. Would anyone be kind enough to point me to the gtk-builder-convert python script?

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• How to generate GIR files from the Vala compiler?

  - by celil

  I am trying to create python bindings to a vala library using pygi with gobject introspection. However, I am having trouble generating the GIR files (that I am planning to compile to typelib files subsequently). According to the documentation valac should support generating GIR files. Compiling the following helloworld.vala public struct Point { public double x; public double y; } public class Person { public int age = 32; public Person(int age) { this.age = age; } } public int main() { var p = Point() { x=0.0, y=0.1 }; stdout.printf("%f %f\n", p.x, p.y); var per = new Person(22); stdout.printf("%d\n", per.age); return 0; } with the command valac helloworld.vala --gir=Hello-1.0.gir doesn't create the Hello-1.0.gir file as one would expect. How can I generate the gir file?

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• Suggestions for a mashup application

  - by Raffo

  I have to write a mashup application for an university course and I have to use some APIs, but I need to choose by myself what to use and what the final application should do. Unfortunately I never made an application like this, so I'm not sure what to do... I don't want to code a stupid app which uses google maps' APIs since the web seems to be full of stuff like this. Have you got any suggestion for me? Is there any mashup web app you want that's still not there?? I can use JAVA, GWT (and google app engine of course) or python, but I also accept suggestions for other languages. Thank you in advance!

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• Gtk+ vs Qt language bindings

  - by Adam Smith

  Put shortly: For those familiar with language bindings in Qt and Gtk+. E.g. python and ruby. Are there any quality or capability difference? More background: I know C++ and Qt very well. Minimal experience with Gtk+. I know C++ is not ideal for language bindings due to the lack of a well defined ABI (application binary interface). I also read that Gtk+ was designed to be bound to other languages. So I wonder how this manifets itself in practice. Are the Gtk+ bindings better maintained or work better in some way than their Qt counterparts? I am presently quite interested in the Go language, and they have started developing Gtk+ bindings. However C++ bindings is far away. It makes me wonder whether learning Gtk+ is worth it.

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• creating PHP C/C++ extension modules using SWIG

  - by morpheous

  I have written some C/C++ extension modules for PHP, using the 'old fashioned way' - i.e. by using the manual way (as described by Sarah Golemon in her book). This is too fiddly for me, and since I am lazy, and would like to automate as much as possible. Also, I have used SWIG now to generate extensions to Python, and I am getting to like using it quite a lot. I am thinking of using SWIG to generate my future PHP extensions. I am using PHP v5.2 (and above) on my production servers. My questions are: Is SWIG PHP interface stable yet (i.e. ready for production)? If you answered yes to question 1 -are YOU using it in YOUR production site? Are there any 'gotchas' I need to be aware of when creating PHP extension ,modules using SWIG?

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• Building highly scalable web services

  - by christopher-mccann

  My team and I are in the middle of developing an application which needs to be able to handle pretty heavy traffic. Not facebook level but in the future I would like to be able to scale to that without massive code re-writes. My thought was to modularise out everything into seperate services with their own interfaces. So for example messaging would have a messaging interface that might have send and getMessages() as methods and then the PHP web app would simply query this interface through soap or curl or something like that. The messaging application could then be any kind of application so a Java application or Python or whatever was suitable for that particular functionality with its own seperate database shard. Is this a good approach?

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• Multi-platform development from one computer

  - by iama

  I am planning to build a new development computer for both Windows & Linux platforms. On Windows, my development would be primarily in .NET/C#/IIS/MSSQL Server. On Linux—preferably Ubuntu—my development would be in Ruby and Python. I am thinking of buying a laptop with Windows 7 pre-installed with 4GB RAM, Intel Core 2 Duo, and 320 GB HD; running 2 VMs for both Windows and Linux development with the host OS as my work station. Of course, I would be running DBs and web servers on the respective platforms. Is this a typical setup? My only concern is running two VMs side by side. Not sure if this configuration would be optimal. Alternative would be to do my Windows development on the host Windows 7 OS. What are your thoughts?

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• Can I specify the order of how changes happen in an single App Engine transaction ? Is it equal to t

  - by indiehacker

  If I passed a list of key ids as an argument in a transaction, would the change associated with the first key in the list happen first? And if not, how do I specify the order that I want the changes to happen in? As a concrete example, consider this code below from Google Docs Transactions--would changes to the first item in acc.key() happen first? class Accumulator(db.Model): counter = db.IntegerProperty() Docshttp://code.google.com/appengine/docs/python/datastore/transactions.html: def increment_counter(key, amount): obj = db.get(key) obj.counter += amount obj.put() q = db.GqlQuery("SELECT * FROM Accumulator") acc = q.get() db.run_in_transaction(increment_counter, acc.key(), 5)

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• django left join with null

  - by SledgehammerPL

  The model: class Product(models.Model): name = models.CharField(max_length = 128) def __unicode__(self): return self.name class Receipt(models.Model): name = models.CharField(max_length=128) components = models.ManyToManyField(Product, through='ReceiptComponent') class Admin: pass def __unicode__(self): return self.name class ReceiptComponent(models.Model): product = models.ForeignKey(Product) receipt = models.ForeignKey(Receipt) quantity = models.FloatField(max_length=9) unit = models.ForeignKey(Unit) def __unicode__(self): return unicode(self.quantity!=0 and self.quantity or '') + ' ' + unicode(self.unit) + ' ' + self.product.genitive The idea: there are a components on stock. I'd like to find out which recipes I can made with components which I have. It's not easy - but possible - I made a SQL view, which gets the solution. But I'm learning python and Django so I'd like to make it Django-style ;D The concept of solution: get the set of recipes which has at last one component: list_of_available_components = ReceiptComponent.objects.filter(product__in=list_of_available_products).distinct() list_of_related_receipts = Receipt.objects.filter(receiptcomponent__in = list_of_available_components).distinct() get recipes (from list_of_related_receipts) which has not at last one component list_of_incomplete_recipes = (SELECT * FROM drinkbook_receiptcomponent LEFT JOIN drinkstore_stock_products USING(product_id) WHERE drinkstore_stock_products.stock_id IS NULL AND receipt_id IN (SELECT receipt_id FROM drinkbook_receiptcomponent JOIN drinkstore_stock_products USING(product_id))) get recipes (from list_of_related_receipts) which are not in "list_of_incomplete_recipes"

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• How many layers are between my program and the hardware?

  - by sub

  I somehow have the feeling that modern systems, including runtime libraries, this exception handler and that built-in debugger build up more and more layers between my (C++) programs and the CPU/rest of the hardware. I'm thinking of something like this: 1 + 2 OS top layer Runtime library/helper/error handler a hell lot of DLL modules OS kernel layer Do you really want to run 1 + 2?-Windows popup (don't take this serious) OS kernel layer Hardware abstraction Hardware Go through at least 100 miles of circuits Eventually arrive at the CPU ADD 1, 2 Go all the way back to my program Nearly all technical things are simply wrong and in some random order, but you get my point right? How much longer/shorter is this chain when I run a C++ program that calculates 1 + 2 at runtime on Windows? How about when I do this in an interpreter? (Python|Ruby|PHP) Is this chain really as dramatic in reality? Does Windows really try "not to stand in the way"? e.g.: Direct connection my binary < hardware?

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• Django : mysql : 1045, "Access denied for user

  - by PlanetUnknown

  I have the whole setup working for months on my local computer. I'm installing on a remote site now. Created a fresh mysql DB, and created a new user ("someuser") and gave it complete grants, like so - GRANT ALL PRIVILEGES ON . TO 'someuser'@'localhost' IDENTIFIED BY 'somepassword' WITH GRANT OPTION; I have sync'd the db, using "python manage.py syncdb" and the correct tables were created. My settings.py has this same user. But when I try to login a user through the application, and it hits the DB, I see the following in the logs - (1045, "Access denied for user 'someuser'@'localhost' (using password: YES)") I logged in through mysql (installed on the same box as django) and checked the grants and it correctly shows - Grants for djangouser@localhost GRANT ALL PRIVILEGES ON * . * TO 'someuser'@'localhost' IDENTIFIED BY PASSWORD '*thesaltedpasswordOverHere' WITH GRANT OPTION I don't want to use the root user/password for django, since it doesn't seem the correct way. Any pointers as to what might be wrong ?

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• Variadic functions and arguments assignment in C/C++

  - by Rizo

  I was wondering if in C/C++ language it is possible to pass arguments to function in key-value form. For example in python you can do: def some_function(arg0 = "default_value", arg1): # (...) value1 = "passed_value" some_function(arg1 = value1) So the alternative code in C could look like this: void some_function(char *arg0 = "default_value", char *arg1) { ; } int main() { char *value1 = "passed_value"; some_function(arg1 = value1); return(0); } So the arguments to use in some_function would be: arg0 = "default_value" arg1 = "passed_value" Any ideas?

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• How can I integrate a bitbucket repository with the hosted on-demand version of FogBugz?

  - by carrier

  I use the on-demand (hosted) version of FogBugz. I would like to start using Mercurial for source control. I would like to integrate FogBugz and a BitBucket repository. I gave it a bit of a try but things weren't going very well. FogBugz requires that you hook up your Mercurial client to a fogbugz.py python script. TortoiseHg doesn't seem to have the hgext directory that they refer to in instructions. So has anyone successfully done something similar?

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• Making DiveIntoPython3 work in IE8 (fixing a Javascript performance issue)

  - by srid

  I am trying to fix the performance problem with Dive Into Python 3 on IE8. Visit this page in IE8 and, after a few moments, you will see the following popup: I traced down the culprit down to this line in j/dip3.js ... find("tr:nth-child(" + (i+1) + ") td:nth-child(2)"); If I disable it (and return from the function immediately), the "Stop executing this script?" dialog does not appear as the page now loads fairly fast. I am no Javascript/jquery expert, so I ask you fellow developers as to why this query is making IE slow. Is there a fix for it? Edit: you can download the entire webpage (980K) for local viewing/editing.

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• How does one go about understanding GNU source code?

  - by Max Dwayne

  I'm really sorry if this sounds kinda dumb. I just finished reading K&R and I worked on some of the exercises. This summer, for my project, I'm thinking of re-implementing a linux utility to expand my understanding of C further so I downloaded the source for GNU tar and sed as they both seem interesting. However, I'm having trouble understanding where it starts, where's the main implementation, where all the weird macros came from, etc. I have a lot of time so that's not really an issue. Am I supposed to familiarize myself with the GNU toolchain (ie. make, binutils, ..) first in order to understand the programs? Or maybe I should start with something a bit smaller (if there's such a thing) ? I have little bit of experience with Java, C++ and python if that matters. Thanks!

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• BASH Install Of Wordpress, Without Visiting wp-admin/install.php

  - by user916825

  I wrote this little BASH script that creates a folder,unzips Wordpress and creates a database for a site. The final step is actually installing Wordpress, which usually involves pointing your browser to install.php and filling out a form in the GUI. I want to do this from the BASH shell, but can't figure out how to invoke wp_install() and pass it the parameters it needs: -admin_email -admin_password -weblog_title -user_name (line 85 in install.php) Here's a similar question, but in python #!/bin/bash #ask for the site name echo "Site Name:" read name # make site directory under splogs mkdir /var/www/splogs/$name dirname="/var/www/splogs/$name" #import wordpress from dropbox cp -r ~/Dropbox/Web/Resources/Wordpress/Core $dirname cd $dirname #unwrap the double wrap mv Core/* ./ rm -r Core mv wp-config-sample.php wp-config.php sed -i 's/database_name_here/'$name'/g' ./wp-config.php sed -i 's/username_here/root/g' ./wp-config.php sed -i 's/password_here/mypassword/g' ./wp-config.php cp -r ~/Dropbox/Web/Resources/Wordpress/Themes/responsive $dirname/wp-content/t$ cd $dirname CMD="create database $name" mysql -uroot -pmypass -e "$CMD" How do I alter the script to automatically run the installer without the need to open a browser?

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• Static Website - Converting to Dynamic, need to import information from database on different host

  - by gvernold

  This seems really complicated to ask about so I hope someone can help: We have a long time running static website held with a hosting company that provide PHP, Ruby-on-Rails and Drupal/Joomla support. A little limited I know but we got reasonably decent search engine rankings and didn't want them to drop. We have two much more recently created sites on another host written in Python/Django. The original site is now too big to handle statically and we want to create a more dynamic site in its place without changing servers/webhosts. The data we want to provide the 'new' dynamic site is from the same database providing the Django sites. What is the best solution to build the new site with? Is it better to create PHP pages that connect to the database on the other host? Ruby-on-rails seems like a very fast development environment not too dissimilar to Django, would we be able to fetch data from the existing databases into a rails site and use similar urls to our old static pages?

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• script to convert css sheet from px to em

  - by Sy Moen

  Anyone know of a script (php, python, perl, bash, whatever) that will convert a stylesheet from px to em? Like, it would take input of the filename and base font-size (default 16) and convert all px instances to em? eg: convertpx2ems --file stylesheet.css --base-font-size 16 would convert this: button { font-size:14px; padding:8px 19px 9px; } to something like this: button { font-size: .875em; padding: .5em 1.188em .563em; } ...maybe, is there a way to do this with sass?

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• Why is django admin not accepting Nullable foreign keys?

  - by p.g.l.hall

  Here is a simplified version of one of my models: class ImportRule(models.Model): feed = models.ForeignKey(Feed) name = models.CharField(max_length=255) feed_provider_category = models.ForeignKey(FeedProviderCategory, null=True) target_subcategories = models.ManyToManyField(Subcategory) This class manages a rule for importing a list of items from a feed into the database. The admin system won't let me add an ImportRule without selecting a feed_provider_category despite it being declared in the model as nullable. The database (SQLite at the moment) even checks out ok: >>> .schema ... CREATE TABLE "someapp_importrule" ( "id" integer NOT NULL PRIMARY KEY, "feed_id" integer NOT NULL REFERENCES "someapp_feed" ("id"), "name" varchar(255) NOT NULL, "feed_provider_category_id" integer REFERENCES "someapp_feedprovidercategory" ("id"), ); ... I can create the object in the python shell easily enough: f = Feed.objects.get(pk=1) i = ImportRule(name='test', feed=f) i.save() ...but the admin system won't let me edit it, of course. How can I get the admin to let me edit/create objects without specifying that foreign key?

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• create_or_update in ModelForm

  - by ykaganovich

  I want to have a ModelForm that can create_or_update a model instance based on the request parameters. I've been trying to cobble something together, but am realizing that my python fu is not strong enough, and the ModelForm implementation code is a quite hairy. I found this create_or_update snipplet for working with a Model, but I think it would be incredibly useful if it were integrated with a ModelForm. I would expect it to behave similarly to ModelForm.save(): class BetterModelForm(forms.ModelForm): def init(self, *args, **kwargs) def create_or_update(self): #magic return (instance, created, updated) Conversely I'd also be interested in hearing compelling reasons why this is not a good idea.

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• Why doesn't IronRuby have the same tools that IronPython does?

  - by rsteckly

  Hi, I've been using Ruby as my main scripting language for years but switched to .NET several years ago. I'd like to continue using Ruby (primarily for testing) BUT the toolset for IronRuby is really nonexistent. Why? In Python, meanwhile, there are project templates and full intellisense support. Why isn't there something like that for IronRuby? The only thing I've been able to find on it is "there are no plans for VS integration at this time." Why???

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• Using Regex groups in bash

  - by AlexeyMK

  Greetings, I've got a directory with a list of pdfs in it: file1.pdf, file2.pdf, morestuff.pdf ... etc. I want to convert these pdfs to pngs, ie file1.png, file2.png, morestuff.png ... etc. The basic command is, convert from to, But I'm having trouble getting convert to rename to the same file name. The obvious 'I wish it worked this way' is convert *.pdf *.png But clearly that doesn't work. My thought process is that I should utilize regular expression grouping here, to say somethink like convert (*).pdf %1.png but that clearly isn't the right syntax. I'm wondering what the correct syntax is, and whether there's a better approach (that doesn't require jumping into perl or python) that I'm ignoring. Thanks!

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• Graphic programming over video playback

  - by ignatius

  I want to make some GUI mockup program for video player, so my idea is just to show some menu pictures over real video being playback. I have working program made with C and SDL just to load pictures and make a slideshow, but i don´t know how to put this over video with transparencies. Do you have a hint? ps. i usually program with python and C, so if there is any solution with this two i highly appreciate. Thanks!

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