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• Best Non-Microsoft/.NET Development Blogs and Podcasts

  - by Mark Lubin

  I really don't want to rile anyone's feathers and I really enjoy blogs like Joel, Coding Horror, Scott Hanselman, etc. However, what are some good blogs/podcasts that focus on other platforms besides Microsoft based ones or maybe even no particular platform at? In particular I am interested in areas like Python, Ruby, Java, C, but any area besides Microsoft fits the bill. There may be other similar questions to this but I think this one is unique since we might get some answers we wouldn't see otherwise, that is, everyone knows Coding Horror is great. Please try to refrain from religious debates; the content of the blog is more important than the platform they are talking about, I just want to get an idea of what is out there and worth the time.

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• Weighted random selection using Walker's Alias Method (c# implementation)

  - by Chuck Norris

  I was looking for this algorithm (algorithm which will randomly select from a list of elements where each element has different probability of being picked (weight) ) and found only python and c implementations, after I did a C# one, a bit different (but I think simpler) I thought I should share it, and ask your opinion ? this is it: using System; using System.Collections.Generic; using System.Linq; namespace ChuckNorris { class Program { static void Main(string[] args) { var oo = new Dictionary<string, int> { {"A",7}, {"B",1}, {"C",9}, {"D",8}, {"E",11}, }; var rnd = new Random(); var pick = rnd.Next(oo.Values.Sum()); var sum = 0; var res = ""; foreach (var o in oo) { sum += o.Value; if(sum >= pick) { res = o.Key; break; } } Console.WriteLine("result is "+ res); } } } if anyone can remake it in f# please post your code

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• Processing a tab delimited file with shell script processing

  - by Lilly Tooner

  Hello, normally I would use Python/Perl for this procedure but I find myself (for political reasons) having to pull this off using a bash shell. I have a large tab delimited file that contains six columns and the second column is integers. I need to shell script a solution that would verify that the file indeed is six columns and that the second column is indeed integers. I am assuming that I would need to use sed/awk here somewhere. Problem is that I'm not that familiar with sed/awk. Any advice would be appreciated. Many thanks! Lilly

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• chat application: pubsubhub vs xmpp

  - by sofia

  I'm unsure on the best stack to build a chat application. Currently I'm thinking of two main options: facebook tornado cons: does not use the main chat protocol xmpp but pubsubhubbub pros: i really like its simplicity for development (webserver + webframework); pubsubhubbub also seems simpler as a protocol than xmpp; and i know python xmpp + bosch, punjab, ejabberd cons: don't know erlang; overall seems a bit harder to develop pros: uses xmpp protocol The chat app will need to have the following: Private messages Public rooms Private rooms Chat history for rooms (not forever, just the last n messages) html embedding url to chat room Both options seem scalable so that's not really my worry (we're thinking of running the app in amazon's ec2 as well). I know there's a project that builds a xmpp server using tornado but it's not ready for production use and our deadline isn't that big. Basically my main worry is ease of development vs somehow regretting later using pubsubhubbub to develop a chat app but I read somewhere that PubSubHubbub might eventually replace XMPP as REST replaced SOAP - so what do you think?

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• Should I learn C?

  - by Justin Standard

  Original Question: Should I Learn C? In the theme of the stackoverflow podcast, here's a fun question: should I learn C? I expect Jeff & Joel will have something to say on this. Some info on my background: Primarily a Java programmer on "enterprisy" systems. Favorite languages: python, scheme 7 years programming experience A very small amount of C++ experience, practically no C experience No immediate "need" to learn C So should I learn C? If so, why? If not, why? C or Assembly? Lots of folks recomending Assembler, so add on question: Is it better to learn C or Assembler? If Assembler, which one? Recommended assemblers so far: Motorolla 68000 Intel Assembler (does he mean x86?) MASM32

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• Django: making raw SQL query, passing multiple/repeated params?

  - by AP257

  Hopefully this should be a fairly straightforward question, I just don't know enough about Python and Django to answer it. I've got a raw SQL query in Django that takes six different parameters, the first two of which (centreLat and centreLng) are each repeated: query = "SELECT units, (SQRT(((lat-%s)*(lat-%s)) + ((lng-%s)*(lng-%s)))) AS distance FROM places WHERE lat<%s AND lat>%s AND lon<%s AND lon>%s ORDER BY distance;" params = [centreLat,centreLng,swLat,neLat,swLng,neLng] places = Place.objects.raw(query, params) How do I structure the params object and the query string so they know which parameters to repeat and where?

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• install play-framework in Ubuntu 9.10

  - by Shekhar

  I have copied zipped file from the playframework.org website and unzipped it at a location. I have inserted it in my .bashrc profile to set up as PATH environment. But still, the play command is not accessible from anywhere. And even in the installed directory of the framework, the play file is not running as it is. I have to prefix python before any play command to run it. Am i making a mistake somewhere? Please help me.

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• Django deployment: PIL and virtualenv problem

  - by AndriJan

  Hey guys, I'm deploying a Django site on my Vserver (Debian Lenny) and I'm having problem with PIL. I'm using virtualenv as well. When I'm in the virtualenv and type pip install -U PIL everything installs fine and I get this: *** TKINTER support not available --- JPEG support available --- ZLIB (PNG/ZIP) support available *** FREETYPE2 support not available *** LITTLECMS support not available And when I go in to the shell (python manage.py shell) and type from PIL import Image I get no error. But when I use it in the Django project (uploading an image in the admin for example) I just get No module named PIL I don't think it's a problem with the model because it works fine on the development machine but here is part of the class: class Category(models.Model): name = models.CharField(max_length=255, verbose_name="Name") logo = models.ImageField(upload_to='images/category/', blank=True, null=True, verbose_name="Logo") I'm going out of my mind about this. I feel like this is a very common issue but I've been trying to google this all day with no luck. Thanks in advance, AndriJan

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• iPhone Feedback Service with PHP

  - by Anish

  HI All, Has anybody been able to extract the device tokens from the binary data that iPhone APNS feedback service returns using PHP? I am looking for something similar to what is been implementented using python here http://www.google.com/codesearch/p?hl=en&sa=N&cd=2&ct=rc#m5eOMDWiKUs/APNSWrapper/%5F%5Finit%5F%5F.py&q=feedback.push.apple.com As per the Apple documentation, I know that the first 4 bytes are timestamp, next 2 bytes is the length of the token and rest of the bytes are the actual token in binary format. (http://developer.apple.com/IPhone/library/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CommunicatingWIthAPS/CommunicatingWIthAPS.html#//apple%5Fref/doc/uid/TP40008194-CH101-SW3) I am successfully able to extract the timestamp from the data feedback service returns, but the device token that I get after i convert to hexadecimal using the PHP's built in method bin2hex() is actually different than original device token. I am doing something silly in the conversion. Can anybody help me out if they have already implemented APNS feedback service using PHP? TIA, -Anish

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• Graphviz DOT arrange Nodes in circles

  - by Ivo Wetzel

  OK here's my problem, I'm generating a graph of a python module, including all the files with their functions/methods/classes. I want to arrange it so, that nodes gather in circles around their parent nodes, currently everything is on one gargantuan horizontal row, which makes the thing 50k pixels wide and also let's the svg converter fail(only renders about the half of the graph). I went trough the docs(http://www.graphviz.org/doc/info/attrs.html) but couldn't find anything that seems to do the trick. So the question is: Is there a simple way to do this or do I have to layout the whole thing by myself? :/

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• Selenium and Headless Environment

  - by sdmythos_gr

  I recently installed Python 2.7, Robot Framework and the Selenium Library (I still don't know if I succeded though...) on a Red Hat Server to run some test on a web application. So I tried a simple test case using the robot framework to see if Selenium Library is functional, just to Open a web page, nothing more... Selenium Server is up and running according to the result of ps, and firefox binaries are in the PATH... Running the test case from the Robot Framework (with the pybot testcasename.tsv) I get an exception: ERROR: Problem capturing a screenshot to string: java.awt.AWTException: headless environment So, what is the Headless Environment? Does anyone have an idea if there is something else that needs to be istalled or to be configured as well?

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• PyQt error: No such signal QObject::dataChanged

  - by DSblizzard

  PyQt application works fine, but when I close it Python shows this message: "Object::connect: No such signal QObject::dataChanged(QModelIndex,QModelIndex)" What is the cause of this? There isn't dataChanged signal in the program. EDIT: Almost minimal program which causes error: import sys from PyQt4.QtCore import * from PyQt4.QtGui import * from PyQt4.QtSql import * import ui_DBMainWindow global Mw, Table, Tv Id, Name, Size = range(3) class TTable(): pass Table = TTable() class TMainWindow(QMainWindow, ui_DBMainWindow.Ui_MainWindow): def __init__(self, parent = None): global Table QMainWindow.__init__(self, parent) self.setupUi(self) self.showMaximized() self.mapper = QDataWidgetMapper(self) self.mapper.setModel(Table.Model) def main(): global Mw, Table, Tv QApp = QApplication(sys.argv) DB = QSqlDatabase.addDatabase("QSQLITE") DB.setDatabaseName("1.db") Table.Model = QSqlTableModel() Table.Model.setTable("MainTable") Table.Model.select() Mw = TMainWindow() QApp.exec_() if __name__ == "__main__": main()

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• Error about 'invalid JSON' with couchDB view but the json's fine...

  - by Chris Huang-Leaver

  I am trying to setup the following view on CouchDB { "_id":"_design/id", "_rev":"1-9be2e55e05ac368da3047841f301203d", "language":"javascript", "views":{ "by_id":{ "map" : "function(doc) { emit(doc.id, doc)}" },"from_user_id":{ "map" : "function(doc) { if (doc.from_user_id) {emit(doc.from_user_id, doc)}}"}, "from_user":{ "map" : "function(doc) { if (doc.from_user) {emit(doc.from_user, doc)}}"}, "to_user_id":{ "map" : "function(doc) {if (doc.to_user_id){ emit(doc.to_user_id, doc)}}"}, "to_user":{ "map" : "function(doc) {if (doc.to_user){ emit(doc.to_user, doc)}}" }, "max_id":{ "map" : "function(doc) { if (doc.id) {emit(doc._id, eval(doc.id))}}", "reduce" :"function(key,value) { a = value[0]; for (i=1; i <value.length; ++i){a = Math.max(a,value[i])} return a}" } } } when I try to 'PUT' this using curl: curl -X PUT -d keys.json $CDB/_design/id {"error":"bad_request","reason":"invalid UTF-8 JSON"} I know it's not invalid JSON, because I tested it using the 'json' library built into Python 2.6, it loads fine. JS screw ups give me the error 'must evaluate to a function' What else might be wrong with it?

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• Colour Name to RGB/Hex/HSL/HSV etc

  - by Abs

  Hello all, I have come across this great function/command. Colour to RGB, you can do this: col2rgb("peachpuff") //returns hex It will return one hex value. I want to extend this using Perl, Python or PHP but I want to be able to pass in, for example, "yellow" and the function returns all types of yellows - their hex/rgb/?/etc value. I already have a quick solution implemented, which involves mapping colour names to hex values but now I want to get more precise and use some formulas etc to determine what's what. However, as usual, I don't have a clue on how to do this! So I appreciate any implementation advice on how to do this. Thanks all

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• CodeIgniter & Datamapper as frontend, Django Admin as backend, database tables inconsistent

  - by Rasiel

  I created a database for a site i'm doing using Django as the admin backend. However because the server where the site is hosted on, won't be able to support Python, I find myself needing to do the front end in PHP and as such i've decided to use CodeIgniter along with Datamapper to map the models/relationship. However DataMapper requires the tables to be in a specific format for it to work, and Django maps its tables differently, using the App name as the prefix in the table. I've tried using the prefix & join_prefix vars in datamapper but still doesn't map them correctly. Has anyone used a combination of this? and if so how have the fixed the issue of db table names being inconsistent? Is there anything out there that i can use to make them work together?

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• Is J2EE/EJBs a dying trend?

  - by Taranfx

  I might be wrong on this, but I no longer see heavy Business and Web services being hosted using J2ee technologies (Especially EJBs). Having known the power and scalability of J2ee applications, what is keeping developers/decision makers to restrict themselves to Core Java (POJOs) or even other web technologies like PHP, python. Is it the development time? Is it the Ease of configuration? (I feel this should not be a strong reason with Java EE 6, things are simplified) Of course scripting languages are faster to develop, we cannot ignore the fact that they are inherently not-as-scalable as Java Applications are (using App servers)

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• What are modern and old compilers written in?

  - by ulum

  As a compiler, other than an interpreter, only needs to translate the input and not run it the performance of itself should be not that problematic as with an interpreter. Therefore, you wouldn't write an interpreter in, let's say Ruby or PHP because it would be far too slow. However, what about compilers? If you would write a compiler in a scripting language maybe even featuring rapid development you could possibly cut the source code and initial development time by halv, at least I think so. To be sure: With scripting language I mean interpreted languages having typical features that make programming faster, easier and more enjoyable for the programmer, usually at least. Examples: PHP, Ruby, Python, maybe JavaScript though that may be an odd choice for a compiler What are compilers normally written in? As I suppose you will respond with something low-level like C, C++ or even Assembler, why? Are there compilers written in scripting languages? What are the (dis)advantages of using low or high level programming languages for compiler writing?

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• Freeware Programmer Calculator

  - by AdamC

  There have been lots of times in the past where a good programmer-oriented calculator would've saved me a lot of time. Lately, I've been doing quite a lot of bit manipulation, and having to do build/run to debug my calculations feels really slow. I've looked for something like this in the past, but found nothing that worked very well. The only thing that comes close is this one from AnalogX, but I can't get it to work or really do anything on my vista box which is where I'm doing most of my work at the moment. (btw - please send comments about my vista usage here;). Anyway, I'm looking for something for simple calculations using a C-like syntax with support for proper precenedce, operators, etc. Bonus points for cross-platform. The python interpreter was a great idea and is totally cross-platform. For windows only SpeQ is amazing. Thanks for the suggestions.

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• How to throttle login attemps in Java webapp?

  - by Jörn Zaefferer

  I want to implement an efficient mechanism to throttle login attemps in my Java web application, to prevent brute-force attacks on user accounts. Jeff explained the why, but not the how. Simon Willison showed an implementation in Python for Django: That doesn't really help me along as I can't use memcached nor Django. Porting his ideas from scratch doesn't seem like a great either - I don't want to reinvent the wheel. I found one Java implementation, though it seems rather naiive: Instead of a LRU cache, it just clears all entries after 15 minutes. EHCache could be an alternative for memcached, but I don't have any experience with it and don't really want to intoduce yet another technology if there are better alternatives for this task. So, whats a good way to implement login throttling in Java?

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• chat application: pubsubhubbub vs xmpp

  - by sofia

  I'm unsure on the best stack to build a chat application. Currently I'm thinking of two main options: facebook tornado cons: does not use the main chat protocol xmpp but pubsubhubbub pros: i really like its simplicity for development (webserver + webframework); pubsubhubbub also seems simpler as a protocol than xmpp; and i know python xmpp + bosch, punjab, ejabberd cons: don't know erlang; overall seems a bit harder to develop pros: uses xmpp protocol The chat app will need to have the following: Private messages Public rooms Private rooms Chat history for rooms (not forever, just the last n messages) html embedding url to chat room Both options seem scalable so that's not really my worry (we're thinking of running the app in amazon's ec2 as well). I know there's a project that builds a xmpp server using tornado but it's not ready for production use and our deadline isn't that big. Basically my main worry is ease of development vs somehow regretting later using pubsubhubbub to develop a chat app but I read somewhere that PubSubHubbub might eventually replace XMPP as REST replaced SOAP - so what do you think?

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• Best way to unit-test WCF REST/SOAP service while dynamically generating stubs

  - by James Black

  I have a webservice written with WCF 4.0 that exposes REST and SOAP functions, and I want to set up my unit tests so that as I work on my web services I can quickly test by having the test framework start up the service, outside of IIS, and then do the tests. I want it to be dynamically generated as I am not certain what the interface will look like, and it is easier to not worry about having to generate the stubs before I start the tests. But, I couldn't get Groovy to work with my web service, so I am curious if Iron Python or Iron Ruby would work well for this, or is there another .NET language that may work well for this.

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• Parsing SGF files in C#

  - by mafutrct

  The text-based Smart Game Format has become the sole file format for exchanging Go game records by now. I stared with disbelieve that there are almost no parsers available. Google yielded a few results in antique Java and Python, but no modern implementations. I am curious if I have to write my own parser. Do you know of a modern implementation in C# or Java? In case there really are no parsers available, how should I implement one? Are there general guidelines or tools (in a C# environment) I should know of? This is an example file: (;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2] RU[Japanese]SZ[19]KM[6.50] PW[White]PB[Black] ;B[pd] ;W[dc] ;B[dq] ;W[pp] ;B[ce] (;W[ed] ;B[ci] ;W[kc]) (;W[do] ;B[dl] ;W[gp] ;B[eo] ;W[en] ;B[fo]))

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• PrestaShop vs. Shopify

  - by Zach L.

  I have seen several Questions comparing different ECommerce CMS's: Prestashop compared to Zen-Cart and osCommerce Magento or Prestashop, which is better? Best php/ruby/python e-commerce solution I was hoping to get some people to weigh in with which they prefer for a relatively small E-shop. I am now primarily looking at PrestaShop and Shopify. I really like that Shopify does the hosting, has quality service, and is simple to understand and theme. However PrestaShop is free and seems to be able to do just as much if not more than Shopify. I have decided that Magento is too clunky for the project, and have read that many other solutions (osCommerce, ZenCart, OpenCart) are outdated, buggy, or just inferior. Thank you!

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• Hidden Features of MXML

  - by Ole Jak

  What are some of the hidden features of MXML? MXML being used in Flex Framework became quite popular language (because Flash Player is something every PC has and Flash Builder, Flash Catalist are quite popular Adobe programms) So at least from the existing features, do you know any that are not well known but very useful. Of course, this question is along the lines of: Hidden Features of ActionScript Hidden Features of JavaScript Hidden Features of CSS Hidden Features of C# Hidden Features of VB.NET Hidden Features of Java Hidden Features of ASP.NET Hidden Features of Python Hidden Features of TextPad Hidden Features of Eclipse Hidden Features of HTML Please specify one feature per answer. Note that it's not always a great idea to use these hidden features; often times they are surprising and confusing to others reading your code.

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• Create a permalink with Javascript

  - by Jon Romero

  I have a textbox where a user puts a string like this: "hello world! I think that __i__ am awesome (yes I am!)" I need to create a correct url like this: hello-world-i-think-that-i-am-awesome-yes-i-am How can be done using reg expressions? Also, is it possible to do it with Greek (for example)? "Ge?a s?? ??sµe" turns to geia-sou-kosme In other programming languages (python/ruby) I am using a translation array. Should I do the same here?

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