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• What is a practical way to debug Rails?

  - by Joshua Fox

  I get the impression that in practice, debuggers are rarely used for Rails applications. (Likewise for other Ruby apps, as well as Python.) We can compare this to the usual practice for Java or VisualStudio programmers--they use an interactive debugger in a graphical IDE. How do people debug Rails applications in practice? I am aware of the variety of debuggers, so no need to mention those, but do serious Rails programmers work without them? If so, why do you choose to do it this way? It seems to me that console printing has its limits when debugging complex logic.

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• I don't really understand "Backend/Serverside" when it comes to web-development?

  - by Mercfh

  In the Web development world, what exactly do backend/server-side programmers do? I guess I don't really understand the whole concept. I've done the HTML/CSS layouts and website design and a little bit of SQL with PHP (still enhancing my skills, it's more of a side project for me). I've also done a small amount of JavaScript/JQuery. But I don't understand the "backend" work, such as the scripting languages (Rails/Python/etc) and such. What exactly do you "do" with them? Are there any books on the subject? I'm not even sure what it means. Is it kinda like what Web Application Frameworks do? Or not so much?

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• How to draw image in memory manually in pyglet?

  - by Mossen

  In pyglet, I want to create an image buffer in memory, then set the bytes manually, then draw it. I tried making a 3x3 red square like this in my draw() function: imageData = pyglet.image.ImageData(3, 3, 'RGB', [1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0 ]) imageData.blit(10, 10) ...but at runtime, Python complains: ctypes.ArgumentError: argument 9: <type 'exceptions.TypeError'>: wrong type Is this the right approach? Am I missing a step? How can I fix this?

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• Game Engine that allows for objects being placed in-game

  - by user185812

  I am looking for a game engine with multiplayer support that allows for players to place objects in the terrain. (eg. in TF2 one can place teleporters, etc...or in minecraft one can place blocks). I don't need the placeable objects to be interactive like in TF2, but I just need an engine that won't make me code this from scratch. I have decent knowledge of Python, PHP, HTML, C++ and C# (and a small knowledge of Lua scripting, although I have only been at it for a few months) so I should be able to handle most engines. So far I have looked at UDK and Cryengine, and wasn't thrilled with either.

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• What would be a best way to code a rudimentary LIMS?

  - by Sam

  Hi, I hope that I am asking the right question at right place. If not, please do not hesitate to point me to the right place. I am working in a laboratory, where computers/programming/programmers are all used only as support. But I believe that we need better information organization and management. Given the diverse information generated in the lab I believe that we need some sort of Laboratory Information Management System. Is there a good starting point to do this? I am myself not a trained programmer. I can code reasonably well in python and R, and if necessary I can learn MySql, php.

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• add-apt-repository not working UbuntuGnome 12.10

  - by nickcannariato

  When I try to add a ppa using the command: sudo add-apt-repository [insert ppa] the output I get is: Error in sitecustomize; set PYTHONVERBOSE for traceback: EOFError: EOF read where not expected Traceback (most recent call last): File "/usr/bin/add-apt-repository", line 3, in <module> from __future__ import print_function EOFError: EOF read where not expected This is the desktop version. It's a clean install and I didn't get any log errors on install. I haven't added or removed any python versions. Can someone set me straight on how to fix this?

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• What can I do with dynamic typing that I can not do with static typing

  - by Justin984

  I've been using python for a few days now and I think I understand the difference between dynamic and static typing. What I don't understand is why it's useful. I keep hearing about its "flexibility" but it seems like it just moves a bunch of compile time checks to runtime, which means more unit tests. This seems like an awfully big tradeoff to make for small advantages like readability and "flexibility". Can someone provide me with a real world example where dynamic typing allows me to do something I can't do with static typing?

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• Complexity of a web application

  - by Dominik G

  I am currently writing my Master's Thesis on maintainability of a web application. I found some methods like the "Maintainability Index" by Coleman et.al. or the "Software Maintainability Index" by Muthanna et.al. For both of them one needs to calculate the cyclomatic complexity. So my question is: Is it possible to measure the cyclomatic complexity of a web application? In my opinion there are three parts to a web application: Server code (PHP, C#, Python, Perl, etc.) Client code (JavaScript) HTML (links and forms as operators, GET-parameters and form fields as operands!?) What do you think? Is there another point of view on the complexity of web application? Did I miss something?

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• High CPU load - Ubuntu 14.04

  - by watt

  I noticed that sometimes when browsing (with other processes in the background), I get very high CPU load for the browser process (over 100%) and the computer becomes really slow. I tried switching from Firefox (with just a few extensions) to Chromium, but same thing happens without me visiting graphics-intense sites, flash sites or anything like that. I also noticed python or node (when running "make") produce the same high CPU load from time to time so this is not necessarily browser-related. When I only have a browser open, it doesn't seem to happen and everything is fine in Windows 7. I switched from unity to gnome3 with no effect. Specs: lenovo w510 (4gb RAM, i7 q820 @ 1.73) + up to date Ubuntu 14.04 64bit. Printscreen: http://imgur.com/8MZJNKC Do you guys have any idea why this might happen? Please let me know if there's other info you need. Thanks!

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• Should a programmer know Linux ?

  - by Maxtor

  I'm a PHP/Python programmer learning Java and C#(.NET). My main OS is windows 7 but I've used Linux and currently dual-booting with Ubuntu. My Linux knowledge however, is pretty limited. I can work with the command line on simple tasks but that's pretty much it. I don't do any shell scripting, don't know very well the most important commands, nor the system in general. My interests are web development, mobile apps and maybe some embedded stuff in the future. Should I get myself familiarized more with Linux ? Even if at the moment I'm not that interested in it? Is it a must for future job positions considering my field of interest? Thank you.

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• How could this diagram of the current most lucrative technologies be improved?

  - by Edward Tanguay

  I'm giving a talk in April 2011 on the "Developer English" and showing my non-developer audience, mostly English teachers, various diagrams to explain how developers see their industry etc. One of these diagrams is "Hot Technologies", basically, if you want to become a developer, what technologies should you learn to have the highest chance of (1) getting a job (2) making a good salary, and (3) work with the most exciting technology. This is a draft I made just to get some ideas out, basically C#, PHP, Java are where the bulk of the jobs are. Mobile development has a big future. JavaScript is becoming more and more important, and I want to list "minor technologies" such a Python, Ruby on Rails to the side, I assume e.g. that in general, there are a much smaller percentage of jobs in these technologies as in C#, PHP, Java. How could this diagram be improved?

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• Beginners' Guide to Development

  - by Bombillazo

  Hello. So I have some experience programming in Java, and at the moment I am learning how to use Python. I have read on the process of game design and such. I also have media covered, got experience with graphics and audio. My question is geared more towards the actual tools to use for making games, developing. I am willing to commit to a long term development cycle, as I will be doing this as a hobby. I've heard of Flash, Gamemaker, etc. I don't intend to create my own Game Engine, so I was looking for a platform that is extensible and easy to program with an OOP mind frame. As a plus it would be great of said game could be played directly from a website. TIA!

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• Using idle time in turn-based (RPG) games for updating

  - by The Communist Duck

  If you take any turn based RPG game there will be large periods of time when nothing is happening because the game is looping over 'wait_for_player_input'. Naturally it seems sensible to use this time to update things. However, this immediately seems to suggest that it would need to be threaded. Is this sort of design possible in a single thread? loop: if not check_something_pressed: update_a_very_small_amount else keep going But if we says 'a_very_small_amount' is only updating a single object each loop, it's going to be very slow at updating. How would you go about this, preferably in a single thread? EDIT: I've tagged this language-agnostic as that seems the sensible thing, though anything more specific to Python would be great. ;-)

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• Thoughts of Cloud Development/Google App Engine

  - by jiewmeng

  I use mainly PHP for web development, but recently, I started thinking about using Google App Engine. It doesn't use PHP which I am already familiar with, so there will be a steeper learning curve. Probably using Python/Django. But I think it maybe worthwhile. Some advantages I see: Focus on App/Development. No need to setup/maintain server ... no more server configs Scales automatically Pay for what you use. Free for low usage Reliable, it's Google after all Some concerns though: Does database with no joins pose a problem for those who used App Engine before? Do I have to upload to Google just to test? Will it be slow compared to testing locally? What are your thoughts and opinions? Why would you use or not use App Engine?

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• How to ask the boss to pay for training courses

  - by jiceo

  Recently I came upon a well known local consulting company that has some interesting courses I'd like to take. The course is not cheap enough for me to pay out of my own pocket and not feel bad afterwards. The thing is that my startup company uses one set of framework (Python+Django) for most of the stuff I have to deal with, but the course covers Ruby on Rails 3. Since I've not had exposure to Ruby on Rails, and after seeing so many people speak highly of the course, I really thought it would be a good opportunity. I know that I'd have to approach my boss at the angle of 'how this might benefit the company' but other than this, any suggestions?

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• Oracle announces Brand New Tuxedo 11g Release

  - by ruma.sanyal

  Today Oracle introduced two brand new products within the Tuxedo product line of its application grid portfolio. Oracle Tuxedo Application Runtime for CICS and Batch and Oracle Application Rehosting Workbench provide the ability to automate rehosting of mainframe Online and Batch applications to open systems running under Oracle Tuxedo. Oracle Application Rehosting Workbench automates adaptation of COBOL programs, JCL conversion for batch applications, and migration of VSAM files and DB2 data schema. Migration cost, risk, and project length and complexity are dramatically reduced with over 90% of application assets re-hosted on open systems 'as-is'. Impact on the organization is minimized - users are protected from change by support for 3270 green screens, and developers continue to use familiar CICS APIs, batxh functions, and common utilities. Other major features of this release are as follows: - Hotpluggability through introduction of Oracle Tuxedo JCA Adapter - Metadata driven application development using SCA programming model - Support for Python and Ruby languages to develop business services - Improved scalability and availability, TSAM enhancements Register for a live webinar with Oracle Fusion Middleware Senior VP Hasan Rizvi Read the press release Find more details on these exciting new products

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• Changing Platform

  - by Liam McLennan

  From time to time a developer makes a break from their platform of choice (.NET, Java, VB, Access, COBOL) and moves to perceived greener pastures. Zed Shaw did it, jumping from Ruby to Python, and Mike Gunderloy went from .NET to Rails. But it can be difficult to change platform. My clients don’t come to me looking for  a software developer, they come looking for a .NET developer. This is a tragic side effect of big software companies marketing. If your village is under attack by bandits, would you turn away the first seven samurai who offered to help because you didn’t like their swords? What matters is how effectively they can defend your village. You should not tell your carpenter what sort of hammer to use and you should not tell your software developer what platform to use.

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• alsHigh CPU load - Ubuntu 14.04

  - by watt

  I noticed that sometimes when browsing (with other processes in the background), I get very high CPU load for the browser process (over 100%) and the computer becomes really slow. I tried switching from Firefox (with just a few extensions) to Chromium, but same thing happens without me visiting graphics-intense sites, flash sites or anything like that. I also noticed python or node (when running "make") produce the same high CPU load from time to time so this is not necessarily browser-related. When I only have a browser open, it doesn't seem to happen and everything is fine in Windows 7. I switched from unity to gnome3 with no effect. Specs: lenovo w510 (4gb RAM, i7 q820 @ 1.73) + up to date Ubuntu 14.04 64bit. Printscreen: http://imgur.com/8MZJNKC Do you guys have any idea why this might happen? Please let me know if there's other info you need. Thanks!

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• How does a self-taught programmer know when he's ready to look for a job?

  - by user645663

  I've been studying computer science on my own for a few years, but I don't personally know anyone who programs. I was wondering how you know when you're ready to start looking for a job? Personally I'm pretty good with Python and Scheme. I know basic data structures and big O. I've written a Scheme interpreter in C and a couple in Scheme and a few other small/medium sized programs. I have a blog, which I'm starting to transfer my knowledge into to be able to "prove" I know how to code. Am I ready to start looking? And on a related note, am I going to be able to get a job with no experience/education?

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• IBus icon is missing at startup?

  - by quanta

  After some installing, tweaking, ... the IBus icon is missing at startup, although it's working fine: $ ps -ef | grep [i]bus quanta 1918 1890 0 09:54 ? 00:00:01 /usr/bin/ibus-daemon --xim quanta 1946 1918 0 09:54 ? 00:00:00 /usr/lib/i386-linux-gnu/ibus/ibus-gconf quanta 1948 1918 0 09:54 ? 00:00:00 /usr/bin/python /usr/share/ibus/ui/gtk/main.py quanta 1951 1 0 09:54 ? 00:00:00 /usr/lib/i386-linux-gnu/ibus/ibus-x11 --kill-daemon quanta 1987 1918 0 09:54 ? 00:00:00 /usr/lib/ibus-unikey/ibus-engine-unikey --ibus I can make it appear by restarting the ibus-daemon: $ ibus-daemon -x -r -d I also have tried to add the IBus to the System tray whitelist but nothing changes. How can I troubleshoot this issue?

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• How can Swift be so much faster than Objective-C?

  - by Yellow

  Apple launched its new programming language Swift today. In the presentation, they made some performance comparisons between Objective-C and Python. The following is a picture of one of their slides, of a comparison of those three languages performing some complex object sort: There was an even more incredible graph about a performance comparison working on some encryption algorithm. Obviously this is a marketing talk, and they didn't go into detail on how this was implemented in each. I leaves me wondering though: how can a new programming language be so much faster? In this example, surely you just have a bad Objective-C compiler or you're doing something in a less efficient way? How else would you explain a 40% performance increase? I understand that garbage collection/automated reference control might produce some additional overhead, but this much?

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• How to install Neatx-Server on ubuntu 12.10?

  - by user111245

  After try: 1. sudo apt-get install python-software-properties && sudo add-apt-repository ppa:freenx-team 2. sudo add-apt-repository ppa:nathan-renniewaldock/ppa && sudo add-apt-repository ppa:freenx-team 3. sudo add-apt-repository ppa:freenx-team None can let the sudo apt-get update to be succeed. Not to mention sudo apt-get install neatx-server. (found no neatx-server) Is there a solution for that? thanks~

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• If Scheme is untyped, how can it have numbers and lists?

  - by Dokkat

  Scheme is said to be just an extension of the Untyped Lambda Calculus (correct me if I am wrong). If that is the case, how can it have Lists and Numbers? Those, to me, look like 2 base types. So I'd say Racket is actually an extension of the Simply Typed Lambda Calculus. No? Question: Is Scheme's type system actually based or more similar to Simply Typed or Untyped Lambda Calculus? In what ways does it differ from Untyped and or Simply Typed Lambda Calculus? (The same question is valid for "untyped" languages such as Python and JavaScript - all of which look like they have base types to me.)

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• How can I relaunch juju daemons without stop/starting local LXC VMs

  - by vaab

  I'm using juju in local mode with LXC. I updated juju on the host with a classical: apt-get install juju And had a plentyful of python errors in juju debug-log probably because juju processes weren't restarted. In order to restart juju processes, I had to do a complete: juju destroy-environment juju bootstrap which deleted all contents in /var/lib/lxc. I was warned, and this was not an issue, but will be when I'll be in a production environment. Is there a way to relaunch juju daemons without stop/starting LXC local VMs ?

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• Why was Objective-C popularity so sudden on TIOBE index?

  - by l46kok

  I'd like to ask a question that is pretty similar to the one being asked here, but for Objective-C. According to TIOBE rankings, the rise of popularity of Objective-C is unprecedented. This is obviously tied to the popularity of Apple products, but I feel like this might be a hasty conclusion to make since it doesn't really explain the stagnant growth of Java (1. There are way more Android O/S devices distributed worldwide, 2. Java is used in virtually every platform one can imagine) Now I haven't programmed in Objective-C at all, but I'd like to ask if there are any unique features or advantages about the language itself compared to other prevalent languages such as C++, Java, C#, Python etc. What are some other factors that contributed into the rise of Objective-C in this short span of time?

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