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• Selecting keys based on metadata, possible with Amazon S3?

  - by nbv4

  I'm sending files to my S3 bucket that are basically gzipped database dumps. They keys are a human readable date ("2010-05-04.dump"), and along with that, I'm setting a metadata field to the UNIX time of the dump. I want to write a script that retrieve the latest dump from the bucket. That is to say I want the the key with the largest unix time metadata value. Is this possible with Amazon S3, or is this not how S3 is meant to work? I'm using both the command line tool aws, and the python library boto

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• View plain text files with different background colors in Mac OSX, for different programming languag

  - by Werner

  Hi, I work with Mac OS X Leopard. I usually have 5 or 10 text files opened at the same time with different programming languages; one for a bash script, another for a python one, etc. When I use exposé all of them look the same, so it is difficult to select them. I wonder how could I work with just plain text files in OSX, so when they are opened in an editor the background color changes or some other thign, so when using exposé it is clear to me which window belongs to what language. I thought about inserting some kind of info to the last line of each document, and then creat some applescript that converts it to RTF or someother text document which includes color in bacjground, so then it is opened with textmate or someother app. Do you know a better approach for this? Thanks

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• Linux friendly (.NET/Mono) browser object?

  - by HankB

  Hi folks, A friend of mine (familiar with C# and .NET on Windows) has asked how to port some functionality to a Linux host. This functionality is based on a JSP web page that fetches some data from the host server and displays it in a banner on a page. His Win/C#/.NET code simply creates a browser object which loads the page and he then inspects the resulting object to extract the data. I'm wondering what alternatives exist to duplicate this function on Ubuntu Linux. I'm not certain that the necessary libraries exist on this installation. I can assume that things like Perl and Python are ubiquitous, but I am not familiar with any libraries that include a browser object capable of executing javascript and exposing the results to another program. Any suggestions that lead in this direction are welcome. Thanks!

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• Hidden Features of Visual Studio (2005-2008)?

  - by shoosh

  VS is such a massively big product that even after years of working with it I sometimes stumble upon a new/better way to do things or things I didn't even know were possible. For instance- Crtl-R,Ctrl-W - show white spaces. essential for editing python build scripts. Under "HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\8.0\Text Editor" Create a String called Guides with the value "RGB(255,0,0), 80" to have a red line at column 80 in the text editor. What other hidden features have you stumbled upon?

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• When compiling programs to run inside a VM, what should march and mtune be set to?

  - by Russ

  With VMs being slave to whatever the host machine is providing, what compiler flags should be provided to gcc? I would normally think that -march=native would be what you would use when compiling for a dedicated box, but the fine detail that -march=native is going to as indicated in this article makes me extremely wary of using it. So... what to set -march and -mtune to inside a VM? For a specific example... My specific case right now is compiling python (and more) in a linux guest inside a KVM-based "cloud" host that I have no real control over the host hardware (aside from 'simple' stuff like CPU GHz m CPU count, and available RAM). Currently, cpuinfo tells me I've got an "AMD Opteron(tm) Processor 6176" but I honestly don't know (yet) if that is reliable and whether the guest can get moved around to different architectures on me to meet the host's infrastructure shuffling needs (sounds hairy/unlikely). All I can really guarantee is my OS, which is a 64-bit linux kernel where uname -m yields x86_64.

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• Issuing native system commands in Scala

  - by Tony

  I want to issue a native system command from a Scala program, and perhaps trap the output. ("ls" comes to mind. There may be other ways to get directory information without issuing the command, but that's beside the point of my question.) It would correspond to os.system(...) in Python. I've looked in "Programming in Scala". I've looked in O'Reilly's "Programming Scala". I've Googled several combinations of terms. No luck yet. Can someone out there give me an example, or point me at a resource where I can find an example?

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• Efficient storage/retrieval method for replayable comet style applications (Google Wave, Etherpad)

  - by Gareth Simpson

  I am considering a web application that would have the same kind of multi user, automatic saving, infinite undo / replay capabilities that you see in Google Wave and Etherpad (albeit on a drastically smaller scale and userbase). Before I go away and reinvent the wheel, is this something that has already been addressed as either a piece of technology or library, or even just a design pattern. I know this isn't necessarily the best Stack Overflow question as there is probably not a "right" answer, but my Google-fu has failed me and I'd just like a reading list! Ordinarily I would be developing under python/django but this is not a firm requirement just a preference :)

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• Handling missing/incomplete data in R

  - by doug

  As you would expect from a DSL aimed at data analysts, R handles missing/incomplete data very well, for instance: Many R functions have an 'na.rm' flag that you can set to 'T' to remove the NAs, but if you want to deal with this before the function call, then: to replace each 'NA' w/ 0: ifelse(is.na(vx), 0, vx) to remove each 'NA': vx = vx[!is.na(a)] to remove entire each row that contains 'NA' from a data frame: dfx = dfx[complete.cases(dfx),] All of these functions remove 'NA' or rows with an 'NA' in them. Sometimes this isn't quite what you want though--making an 'NA'-excised copy of the data frame might be necessary for the next step in the workflow but in subsequent steps you often want those rows back (e.g., to calculate a column-wise statistic for a column that has missing rows caused by a prior call to 'complete cases' yet that column has no 'NA' values in it). to be as clear as possible about what i'm looking for: python/numpy has a class, 'masked array', with a 'mask' method, which lets you conceal--but not remove--NAs during a function call. Is there an analogous function in R?

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• Vim or Emacs for software development

  - by Justin

  I'm not trying to start any wars here, just get some good info. I'm getting a little exhausted using numerous IDE's for development (VS, XCode, Eclipse/Netbeans, and TextMate) and am looking for a replacement I can use on all the different machines I interact with. What are some of the pros of Vim/Emacs for things like Languages supported Syntax highlighting (for things such as c, objc-c, c#, java, python, haskell, html, javascript, xml etc...) Code completion Code folding Working with a directory of files (like have a solution/project opened) Possible debugger support What are some of the main things you like about (Emacs/Vim, and please no flames only what you really like) Thanks =) *(yes.. I have scoured the net reading this vs that etc. but I'd like more of a 'why you love it' vs 'this is better than that because...')

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• Transform PDF to HTML, keep layout

  - by Tgr

  What methods are there to transform a PDF to HTML? It could be anything - online service, software, library. (Opensource preferred. In the last case, php or python would be preferred.) It has to keep the original layout (including page numbers, footnotes and such), keep the images (combining them to one single background image per page is acceptable) and keep the links. It should preferably output valid XHTML and clean up PDF features such as ligatures, but if there is some post-processing required, I can live with that. Something with a clean, relatively semantic HTML output would be great. The closest one I found was zamzar.org, but it choked on links. (Also, the HTML output is an ugly heap of absolutely positioned divs and needs post-processing because of encoding problems.)

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• Getters and Setters: Code smell, Necessary Evil, or Can't Live Without Them [closed]

  - by Avery Payne

  Possible Duplicate: Allen Holub wrote “You should never use get/set functions”, is he correct? Is there a good, no, a very good reason, to go through all the trouble of using getters and setters for object-oriented languages? What's wrong with just using a direct reference to a property or method? Is there some kind of "semantical coverup" that people don't want to talk about in polite company? Was I just too tired and fell asleep when someone walked out and said "Thou Shalt Write Copious Amounts of Code to Obtain Getters and Setters"? Follow-up after a year: It seems to be a common occurrence with Java, less so with Python. I'm beginning to wonder if this is more of a cultural phenomena (related to the limitations of the language) rather than "sage advice". The -1 question score is complete for-the-lulz as far as I am concerned. It's interesting that there are specific questions that are downvoted, not because they are "bad questions", but rather, because they hit someone's raw nerve.

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• If OOP makes problems with large projects, what doesn't?

  - by osca

  I learned Python OOP at school. My (good in theory, bad in practice) informatics told us about how good OOP was for any purpose; Even/Especially for large projects. Now I don't have any experience with teamwork in software development (what a pity, I'd like to program in a team) and I don't know anything about scaling and large projects either. Since some time I'm reading more and more about that object-oriented programming has (many) disadvantages when it comes to really big and important projects/systems. I got a bit confused by that as I always thought that OOP helped you keep large amounts of code clean and structured. Now why should OOP be problematic in large projects? If it is, what would be better? Functional, Declarative/Imperative?

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• Django sys.path.append for project *and* app needed under WSGI

  - by GerardJP

  Hi all, Could somebody give me a pointer on why I need to add my project root path to the python path as well as the application itself in my WSGI file? Project base is called 'djapp', the application is called 'myapp'. sys.path.append(os.path.dirname(os.path.abspath(__file__)) + '/..') sys.path.append(os.path.dirname(os.path.abspath(__file__)) + '/../djapp') os.environ['DJANGO_SETTINGS_MODULE'] = 'djapp.settings' If I omit the line with "/../djapp/" the log tells my that 'myapp' can not be imported, even though 'djapp.settings' is. (validating 'djapp' was imported) It al runs properly with the ./manage.py command. there's a __init__ in the project folder. For testings sake, I see the same issue using addsitedir: site.addsitedir('/home/user/web/project/') site.addsitedir('/home/user/web/project/djapp') Thanx a lot. Gerard.

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• Is there a "Language-Aware" diff?

  - by JS

  (Appologies for the poor title. I'm open to suggestions for a better one. "Language-gnostic", perhaps?) Does there exist a diff utility (preferably *nix-based) that will diff files based on how a (selectable) language compiler would view the code? For example, to a Python compiler, these two 'graphs are identical: # The quick brown fox jumped vs: # The quick brown # fox jumped Telling most diffs (at least the one's I'm familiar with) to ignore spaces and linebreaks still causes them to flag a difference due to the extra '#'. "Language-sensitivity" would sure help to cut down on the "noise". Ideally, it would work in xemacs....(<-- probably pushing my luck? :-)

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• tools for testing vim plugins

  - by intuited

  I'm looking for some tools for testing vim scripts. Either vim scripts that do unit/functional testing, or classes for some other library (eg Python's unittest module) that make it convenient to run vim with parameters that cause it to do some tests on its environment, and determine from the output whether or not a given test passed. I'm aware of a couple of vim scripts that do unit testing, but they're sort of vaguely documented and may or may not actually be useful: vim-unit: purports "To provide vim scripts with a simple unit testing framework and tools" first and only version (v0.1) was released in 2004 documentation doesn't mention whether or not it works reliably, other than to state that it is "fare [sic] from finished". unit-test.vim: This one also seems pretty experimental, and may not be particularly reliable. May have been abandoned or back-shelved: last commit was in 2009-11 ( 6 months ago) No tagged revisions have been created (ie no releases) So information from people who are using one of those two existent modules, and/or links to other, more clearly usable, options, are very welcome.

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• .NET & ASP vs PHP

  - by gargantaun

  Earlier today I asked wether it would be a good idea to develop websites using C#. Most of the answers pointed towards .NET and ASP. Currently I develop with PHP. I've dabbled with Python and RoR but I always come back to PHP. This is the first time I've looked at .NET and ASP. A bucket load of Google searches later I'm not really seeing much support for ASP online but then it all seems a bit Biased towards PHP/Apache/MySQL. It looks like there's a fair amount of .NET and ASP folk around here so I figured it's worth a shot asking for their input in attempt to try and address the balance in my own head. It can't all be bad. What advantages are there to .NET and ASP over PHP?

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• Is there a language designed for code golf?

  - by J S

  I am not really a fan of code golf, but I have to wonder, is there an esoteric language designed for it? I mean a language with following properties: Common programs may be expressed in very short amount of characters It uses ASCII character set effectively (for example, common operators are not identifiers, so they don't have to be separated by whitespace, character usage is distributed more or less evenly because we cannot use Huffman coding and so on) Except the terse syntax, it should have very expressible and clean semantics (like, let's say, Python or Scheme); it shouldn't be difficult to program in It doesn't need features for large scale programs, such as OOP, but it definitely should allow custom functions and data structures It should have a large standard library, identifiers in this library should be as short as possible Maybe it should be called CG? Languages that can be a source of inspiration are Forth, APL and Joy.

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• PHP - Frameworks, ORM, Encapsulation.

  - by Ian

  Programming languages/environments aside, are there many developers who are using a framework in PHP, ORM and still abide by encapsulation for the DAL/BLL? I'm managing a team of a few developers and am finding that most of the frameworks require me to do daily code inspection because my developers are using the built in ORM. Right now, I've been using a tool to generate the classes and CRUD myself, with an area for them to write additional queries/functions. What's been happening though, is they are creating vulnerabilities by not doing proper checks on data permission, or allowing the key fields to be manipulated in the form. Any suggestions, other than get a new team and a new language (I've seen Python/Ruby frameworks have the same issues).

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• Is there a smart web developer language skill combination?

  - by Cryo

  I'm no newbie to programming, but I'm making the move to a career in web development, and I've noticed that so many job postings have different combinations of skill requirements: (PHP, C#, XML, XHTML/CSS, ASP, .NET, jQuery, YUI, Joomla, Ruby, Perl, Python, Java, Javascript... the list goes on.) As of now, I've started learning XHTML, CSS, JavaScript, jQuery, PHP, and mySQL, but with so many combinations, I want to plan ahead to have a marketable combination of skills as early on as possible. Am I on the right path? What is vital for a marketable web programmer's arsenal? Thanks for your thoughts.

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• Offline mode app in a (HTML5) browser possible?

  - by Horace Ho

  Is it possible to build an application inside in browser? An application means: 1 Where there is connection (online mode) between the browser and an remote application server: the application runs in typical web-based mode the application stores necessary data in offline storage, to be used in offline mode (2) the application sync/push data (captured during offline mode) back to the server when it is resumed from offline mode back to online mode 2 Where there is no connection (offline mode) between the browser and an remote application server: the application will still run (javascript?) the application will present data (which is stored offline) to user the application can accept input from user (and store/append in offline storage) Is this possible? If the answer is a yes, is there any (Ruby/Python/PHP) framework being built? Thanks

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• Custom SQL Server driver

  - by hoodoos

  I had a crazy thought about writing my own SQL Server driver to make it work something like non-blocking http client, so it won't be thread thirsty and could handle lots of db queries within one thread. I tried to look over google for some guidelines about implementing SQL Server client protocol, but found none really, where do those guys get information about it when they write own implementations for PHP or python? I need a really low level to be documented so I can implement all phases of working with a connection through sockets. And would be really nice to have a an example in c# language. :)

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• Validation errors from Google App Engine Logout link

  - by goggin13

  I am making a web page using the Google App Engine. I am validating my pages, and found that the logout link that is generated by the call to the users api (in python) users.create_logout_url(request.uri) does not validate as XHTML 1.0 Strict. The href in the anchor tag looks like this: /_ah/login?continue=http%3A//localhost%3A8080/&action=Logout Including a link with this anchor text throws three different validation errors: *general entity "action" not defined and no default entity *reference to entity "action" for which no system identifier could be generated *EntityRef: expecting ';' Here is a dummy page with the anchor tag in it, if you want to try it on w3c validator.Dummy Page. The logout link wont work, but you can see how the page is valid without it, but the actual text inside the href tag breaks the validation. Any thoughts on whats going on? Thank you!

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• use qt and django to create desktop apps

  - by sandra

  Hi guys, I had this idea of creating desktop apps using django. The principe being: - Write the django app, and use something like cherrypy to serve it. - Write a Qt app in C++ to access it and this by using QtWebview (webkit) I'd like to "bundle" this in a single app. The lighter, the better :) So here are my questions and if you have better ideas and suggestions, please share them :) Is it possible to serve a django app with a c++ one? (a c++ server embedding python)? anyone did this before? Do you have some articles, blog posts? Thanks a lot!

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• manage.py runserver not working

  - by Dan Appleyard

  I am new to django and python in general, so pardon me for any simple mistakes I may be doing. I am trying to setup my first django project on my local windows vista machine. I have created the project successfully with no problems. The issue I am coming across is when my settings.py has values for my database keys, the manage.py runserver command is failing. If I have values in settings before I run the command, as soon as I run it I get errors. If I have already run the command and the server is running, as soon as I edit the settings file with values, the errors show up in my still open command prompt. The inner most exception seems to "Error loading MySQLdb module: No module named MYSQLdb". If I leave the settings.py blank, the command executes with no problems. Any advice would be greatly appreciated! Thanks

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• rsvg doesn't render linked images

  - by colinmarc

  I use the python rsvg bindings to render an svg image into cairo and save to file, which mostly works. But if the svg file contains a linked image, like so: <image href="static/usrimgs/tmpDtIKpx.png" x="10" y="10" width="600px" height="400px"></image> the image doesn't show up in the final file (the rest of the svg renders just fine). The relative path is correct based on where the script is running, but I'm guessing there's some problem with the fact that it would normally be a relative URL, not a relative filepath. How do I get around this?

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