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  • Hidden features of Python

    - by jelovirt
    What are the lesser-known but useful features of the Python programming language? Try to limit answers to Python core One feature per answer Give an example and short description of the feature, not just a link to documentation Label the feature using bold title as the first line This question is along the lines of : 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 JavaScript

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  • Problem solving-pascal

    - by lancelot-clair
    Salutations, Need some help writing this; a pseudocode that accepts as input the name and sections(160, 220, 280, 350, 425) of a masquerader, continue to run until a blank name is input. After that, pseudocode should process the amount the masquerader pay.Then pseudocode code output masqueraders name and amount to pay. Then use programming language Pascal to write this. Thanks, appreciate your response.

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  • Converting from RGB to HSL with Objective C

    - by treeba
    I'm quite new to objective c but have been programming for a while. I started creating a function that would convert from RGB to HSL and back again but I get a feeling it is way too long and headed in the wrong direction. Does anyone know of a simple way to perform this conversion?

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  • Effects of HTTP/TCP connection handshakes and server performance

    - by Blankman
    When running apache bench on the same server as the website like: ab -n 1000 -c 10 localhost:8080/ I am most probably not getting accurate results when compared to users hitting the server from various locations. I'm trying to understand how or rather why this will effect real world performance since a user in china will have different latency issues when compared to someone in the same state/country. Say my web server has a maximum thread limit of 100. Can someone explain in detail how end user latency can/will effect server performance. I'm assuming here that each request will be computed equally at say 10ms. What I'm not understand is how external factors can effect overal server performance, specifically internet connections (location, or even device like mobile) and http/tcp handshakes etc.

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  • Get 2 recoeds from PLSQL Cursor

    - by Hany
    Hi Guys... my Question is short, I create a cursor to get some values from my table I want to get the current record of cursor (the fetched record) and the next record from the cursor without fetching it, cause I want to make a calculation over the current record and the next record. in traditional Programming it's a simple operation you can do it with for index by increasing it by 1. do you have any suggestion :) thx

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  • c++ FFT Beat detection library?

    - by mokaschitta
    Hi, I am currently looking around for a good allround beat detection library / source code in C++ since I found it really hard to achieve satisfying results with the beat detection code I wrote myself using this tutorial: http://www.gamedev.net/reference/programming/features/beatdetection/ It's especially really hard if you want to make it work with any kind of music so I was wondering if there is something usable out there allready? Thanks!

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  • UIImage color changing?

    - by senthilmuthu
    hi, how can i change the UIImage's Color through Programming,any help pls?if i send UIImage, its color must be changed ..any help please? if i change rgb color like the following through bitmaphandling it did not work.i have given blackcolor's RGB value like 0,0,0.....

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  • A good web data extraction/screen scraper program?

    - by Taylor
    I need to capture product data from a site on a regular basis and wondered if any one knows of a good software program? I've trialed Mozenda but its a monthly subscription and pricey in the long term. Obviously something thats free would be best but I don't mind paying either. Just need a decent program thats reliable and doesn't require much programming knowledge.

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  • How can I limit my data usage over tethering on Windows?

    - by Casebash
    The excess data charges if I go over my tethering data limit are ridiculously. Fennec already stated the question well. Because of this, and on general principle, I'd like to have some tools which permit me to do things like: Monitor the amount of bandwidth that I've used I think I can do this from Sprint too, but on-the-computer is nice too on-the-computer gives me a possibility of breaking it down by application See what sort of programs are using the Internet connection I could use, like, Wireshark, but that's a bit too micro-level to be practical Keep those programs, and the operating system, from doing things like "downloading an operating system update" while on the mobile hotspot Related I want to monitor and limit OS X's data transfer while I'm tethering via my iPhone

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  • Rails on server syntax error?

    - by Danny McClelland
    Hi Everyone, I am trying to get my rails application running on my web server, but when I run the rake db:migrate I get the following error: r oot@oak [/home/macandco/rails_apps/survey_manager]# rake db:migrate (in /home/macandco/rails_apps/survey_manager) == Baseapp: migrating ======================================================== -- create_table(:settings, {:force=>true}) -> 0.0072s -- create_table(:users) -> 0.0072s -- add_index(:users, :login, {:unique=>true}) -> 0.0097s -- create_table(:profiles) -> 0.0084s -- create_table(:open_id_authentication_associations, {:force=>true}) -> 0.0067s -- create_table(:open_id_authentication_nonces, {:force=>true}) -> 0.0064s -- create_table(:roles) -> 0.0052s -- create_table(:roles_users, {:id=>false}) -> 0.0060s rake aborted! An error has occurred, all later migrations canceled: 555 5.5.2 Syntax error. g9sm2526951gvc.8 Has anyone come across this before? Thanks, Danny Main Migration file c lass Baseapp < ActiveRecord::Migration def self.up # Create Settings Table create_table :settings, :force => true do |t| t.string :label t.string :identifier t.text :description t.string :field_type, :default => 'string' t.text :value t.timestamps end # Create Users Table create_table :users do |t| t.string :login, :limit => 40 t.string :identity_url t.string :name, :limit => 100, :default => '', :null => true t.string :email, :limit => 100 t.string :mobile t.string :signaturenotes t.string :crypted_password, :limit => 40 t.string :salt, :limit => 40 t.string :remember_token, :limit => 40 t.string :activation_code, :limit => 40 t.string :state, :null => :false, :default => 'passive' t.datetime :remember_token_expires_at t.string :password_reset_code, :default => nil t.datetime :activated_at t.datetime :deleted_at t.timestamps end add_index :users, :login, :unique => true # Create Profile Table create_table :profiles do |t| t.references :user t.string :real_name t.string :location t.string :website t.string :mobile t.timestamps end # Create OpenID Tables create_table :open_id_authentication_associations, :force => true do |t| t.integer :issued, :lifetime t.string :handle, :assoc_type t.binary :server_url, :secret end create_table :open_id_authentication_nonces, :force => true do |t| t.integer :timestamp, :null => false t.string :server_url, :null => true t.string :salt, :null => false end create_table :roles do |t| t.column :name, :string end # generate the join table create_table :roles_users, :id => false do |t| t.column :role_id, :integer t.column :user_id, :integer end # Create admin role and user admin_role = Role.create(:name => 'admin') user = User.create do |u| u.login = 'admin' u.password = u.password_confirmation = 'advices' u.email = '[email protected]' end user.register! user.activate! user.roles << admin_role end def self.down # Drop all BaseApp drop_table :settings drop_table :users drop_table :profiles drop_table :open_id_authentication_associations drop_table :open_id_authentication_nonces drop_table :roles drop_table :roles_users end end

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  • delphi prism online resources

    - by omair iqbal
    google search on ''delphi prism' , ''delphi prism resources'' or ''delphi prism code snippets'' reveal almost no good site at all are there any good programming site(s) with some good amount of code snippets and tutorials on delphi prism thanks in advance

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  • Is MVVM pointless?

    - by joebeazelman
    Is orthodox MVVM implementation pointless? I am creating a new application and I considered Windows Forms and WPF. I chose WPF because it's future-proof and offer lots of flexibility. There is less code and easier to make significant changes to your UI using XAML. Since the choice for WPF is obvious, I figured that I may as well go all the way by using MVVM as my application architecture since it offers blendability, separation concerns and unit testability. Theoretically, it seems beautiful like the holy grail of UI programming. This brief adventure; however, has turned into a real headache. As expected in practice, I’m finding that I’ve traded one problem for another. I tend to be an obsessive programmer in that I want to do things the right way so that I can get the right results and possibly become a better programmer. The MVVM pattern just flunked my test on productivity and has just turned into a big yucky hack! The clear case in point is adding support for a Modal dialog box. The correct way is to put up a dialog box and tie it to a view model. Getting this to work is difficult. In order to benefit from the MVVM pattern, you have to distribute code in several places throughout the layers of your application. You also have to use esoteric programming constructs like templates and lamba expressions. Stuff that makes you stare at the screen scratching your head. This makes maintenance and debugging a nightmare waiting to happen as I recently discovered. I had an about box working fine until I got an exception the second time I invoked it, saying that it couldn’t show the dialog box again once it is closed. I had to add an event handler for the close functionality to the dialog window, another one in the IDialogView implementation of it and finally another in the IDialogViewModel. I thought MVVM would save us from such extravagant hackery! There are several folks out there with competing solutions to this problem and they are all hacks and don’t provide a clean, easily reusable, elegant solution. Most of the MVVM toolkits gloss over dialogs and when they do address them, they are just alert boxes that don’t require custom interfaces or view models. I’m planning on giving up on the MVVM view pattern, at least its orthodox implementation of it. What do you think? Has it been worth the trouble for you if you had any? Am I just a incompetent programmer or does MVVM not what it's hyped up to be?

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  • Code to send email not working.

    - by RPK
    When I am trying to execute following code to email the contact form details, it is not executing properly. Instead, when the contact form's Submit button is clicked, it just shows the below source code in the browser. What's wrong? <?php error_notice(E_ALL^E_NOTICE); $firstname = $_POST['fname']; $emailaddress = $_POST['eaddress']; $mobile = $_POST['cellno']; $phone = $_POST['landline']; $country = $_POST['ucountry']; $city = $_POST['ucity']; $subjects = $_POST['usubjects']; $message = $_POST['umessage']; // EDIT THE 2 LINES BELOW AS REQUIRED $email_to = "[email protected]"; $email_subject = $subjects; function died($error) { // your error code can go here echo "We are very sorry, but there were error(s) found with the form your submitted. "; echo "These errors appear below.<br /><br />"; echo $error."<br /><br />"; echo "Please go back and fix these errors.<br /><br />"; die(); } // validation expected data exists if(!isset($firstname) || !isset($emailaddress) || !isset($subjects) || !isset($message)) { died('We are sorry, but there appears to be a problem with the form your submitted.'); } $error_message = ""; $email_exp = "^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$"; if(!eregi($email_exp,$emailaddress)) { $error_message .= 'The Email Address you entered does not appear to be valid.<br />'; } $string_exp = "^[a-z .'-]+$"; if(!eregi($string_exp,$firstname)) { $error_message .= 'The First Name you entered does not appear to be valid.<br />'; } if(strlen($message) < 2) { $error_message .= 'The Comments you entered do not appear to be valid.<br />'; } $string_exp = "^[0-9 .-]+$"; if(!eregi($string_exp,$phone)) { $error_message .= 'The Telphone Number you entered does not appear to be valid.<br />'; } if(strlen($error_message) > 0) { died($error_message); } $email_message = "Form details below.\n\n"; function clean_string($string) { $bad = array("content-type","bcc:","to:","cc:","href"); return str_replace($bad,"",$string); } $email_message .= "First Name: ".clean_string($firstname)."\n"; $email_message .= "Last Name: ".clean_string($mobile)."\n"; $email_message .= "Email: ".clean_string($emailaddress)."\n"; $email_message .= "Telephone: ".clean_string($phone)."\n"; $email_message .= "City: ".clean_string($city)."\n"; $email_message .= "Telephone: ".clean_string($country)."\n"; $email_message .= "Comments: ".clean_string($message)."\n"; // create email headers $headers = 'From: '.$email_from."\r\n". 'Reply-To: '.$email_from."\r\n" . 'X-Mailer: PHP/' . phpversion(); @mail($email_to, $email_subject, $email_message, $headers); ?>

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  • Anonymous methods/functions: a fundamental feature or a violation of OO principles?

    - by RD1
    Is the recent movement towards anonymous methods/functions by mainstream languages like perl and C# something important, or a weird feature that violates OO principles? Are recent libraries like the most recent version of Intel's Thread Building Blocks and Microsofts PPL and Linq that depend on such things a good thing, or not? Are languages that currently reject anonymous methods/functions, like Java, making wise choices in sticking with a purely OO model, or are they falling behind by lacking a fundamental programming feature?

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  • UUID library for C?

    - by ptomato
    I'm looking for a UUID library for programming in C, that has a reasonable probability of being installed (or at least installable by package manager) on most modern Linux desktops, and works with pkg-config. The following two possibilities seem most obvious: OSSP UUID Libuuid from e2fsprogs Does anybody have experience with these two and can recommend one over the other, or a third possiblity?

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  • Get two records from PLSQL cursor

    - by Hany
    My question is short. I create a cursor to get some values from my table. I want to get the current record of cursor (the fetched record) and the next record from the cursor without fetching it, because I want to make a calculation over the current record and the next record. In traditional programming it's a simple operation; you can do it with a for index by increasing it by 1. Do you have any suggestions?

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  • How to set android lock screen image

    - by robintw
    Hi, I'm just getting started with android programming, and want to see if there is a way to programmatically set the lock screen image. I've found various ways of setting the wallpaper in the API, but I can't seem to find the equivalent ways of setting the lock screen image. I've seen various posts saying that customising the lock screen by adding widgets or bits of applications is not possible, but surely there must be a way to set the image programmatically? Cheers, Robin

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  • My acer aspire laptop suddenly stopped working, just a blank screen

    - by mazda
    My acer aspire laptop suddenly stopped working while it was connected to my nokia mobile modem through usb. It stopped with power swich staying on and no response to clicking off, no irregular sound, nothing but just a blank screen. I disconnected the power and battery quickly but power switch did not respond at all and even the power indicator didn't turn on again. the display was also gone after disconecting the power and removing battery. It has no response or any sign of power while both battery and power supply are working. What do you think? A completely dead mainboard? Does the MB has any safty board or fuse that could be replaced? Any suggestion will be appreciated, Thank you.

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  • Haskell newbie on types

    - by garulfo
    I'm completely new to Haskell (and more generally to functional programming), so forgive me if this is really basic stuff. To get more than a taste, I try to implement in Haskell some algorithmic stuff I'm working on. I have a simple module Interval that implements intervals on the line. It contains the type data Interval t = Interval t t the helper function makeInterval :: (Ord t) => t -> t -> Interval t makeInterval l r | l <= r = Interval l r | otherwise = error "bad interval" and some utility functions about intervals. Here, my interest lies in multidimensional intervals (d-intervals), those objects that are composed of d intervals. I want to separately consider d-intervals that are the union of d disjoint intervals on the line (multiple interval) from those that are the union of d interval on d separate lines (track interval). With distinct algorithmic treatments in mind, I think it would be nice to have two distinct types (even if both are lists of intervals here) such as import qualified Interval as I -- Multilple interval newtype MInterval t = MInterval [I.Interval t] -- Track interval newtype TInterval t = TInterval [I.Interval t] to allow for distinct sanity checks, e.g. makeMInterval :: (Ord t) => [I.Interval t] -> MInterval t makeMInterval is = if foldr (&&) True [I.precedes i i' | (i, i') <- zip is (tail is)] then (MInterval is) else error "bad multiple interval" makeTInterval :: (Ord t) => [I.Interval t] -> TInterval t makeTInterval = TInterval I now get to the point, at last! But some functions are naturally concerned with both multiple intervals and track intervals. For example, a function order would return the number of intervals in a multiple interval or a track interval. What can I do? Adding -- Dimensional interval data DInterval t = MIntervalStuff (MInterval t) | TIntervalStuff (TInterval t) does not help much, since, if I understand well (correct me if I'm wrong), I would have to write order :: DInterval t -> Int order (MIntervalStuff (MInterval is)) = length is order (TIntervalStuff (TInterval is)) = length is and call order as order (MIntervalStuff is) or order (TIntervalStuff is) when is is a MInterval or a TInterval. Not that great, it looks odd. Neither I want to duplicate the function (I have many functions that are concerned with both multiple and track intevals, and some other d-interval definitions such as equal length multiple and track intervals). I'm left with the feeling that I'm completely wrong and have missed some important point about types in Haskell (and/or can't forget enough here about OO programming). So, quite a newbie question, what would be the best way in Haskell to deal with such a situation? Do I have to forget about introducing MInterval and TInterval and go with one type only? Thanks a lot for your help, Garulfo

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  • How to open an iPhone compatible M3U file on Windows?

    - by user1158667
    This is how the M3U file looks like: #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1400000 http://maskedip/http_livestr.str?r=true&id=mbit-test&k=testkey #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=900000 http://maskedip/http_livestr.str?r=true&id=test&k=testkey #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=450000 http://maskedip/http_livestr.str?r=true&id=mobile-test&k=testkey #EXT-X-STREAM-INF:PROGRAM-ID=1,CODECS="mp4a.40.2",BANDWIDTH=64000 http://maskedup/http_livestr.str?r=true&id=test-audio&k=testkey Clicking on http://maskedip/http_livestr.str?r=true&id=mbit-test&k=testkey then returns another M3U file in this format: #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1361 #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1361.ts #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1362.ts #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1363.ts #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1364.ts #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1365.ts #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1366.ts #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1367.ts #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1368.ts #EXTINF:10, http://maskedip/http_ls/testkey/mbit-test1/1369.ts Anyways, VLC won't recognize it. How can I play this on the PC?

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