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• What are the common programming mistakes in Python?

  - by Paul McGuire

  I was about to tag the recent question in which the OP accidentally shadowed the builtin operator module with his own local operator.py with the "common-mistakes" tag, and I saw that there are a number of interesting questions posted asking for common mistakes to avoid in Java, Ruby, Scala, Clojure, .Net, jQuery, Haskell, SQL, ColdFusion, and so on, but I didn't see any for Python. For the benefit of Python beginners, can we enumerate the common mistakes that we have all committed at one time or another, in the hopes of maybe steering a newbie or two clear of them? (In homage to "The Princess Bride", I call these the Classic Blunders.) If possible, a little supporting explanation on what the problem is, and the generally accepted resolution/workaround, so that the beginning Pythoner doesn't read your answer and say "ok, that's a mistake, how do I fix it?"

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• Data truncation when retrieving data from MySQL database with prepared statements

  - by KSiimson

  I have a script that retrieves multiple products using prepared statements. Like putting loops into loops, I have prepared statements in prepared statements - so there is a prepared statement for retrieving all products, a prepared statement to retrieve all images for that product, a prepared statement to get all attributes for that products, and so on. This does not work with one MySQLi instance, so I use multiple MySQLi objects that are opened and closed when needed. It usually works fine, but sometimes, especially when displaying multiple products, some data is truncated. For example - MicoLoans becomes MicoLoa. There was an actual spelling mistake here - now when I changed MicoLoans to MicroLoans, the same page displayed MicroLoa... So the same number of characters was truncated from the end. It is sort of consistent where it appears - for example there can be descriptions for 8 products, and description of 1 product is heavily truncated. When I add 9th product, the short description is still truncated for that same product as before. Any ideas?

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• What is everything involved from typing in code to executing a program?

  - by Befall

  I realized, when just asking a question, I don't understand all the components that are part of the coding process. This seems a silly question, but I can't find a definitive answer on Google, Wiki, nothing. What exactly are all the parts called, and how do they work and intertwine? I'm talking whatever you type code into, whatever checks that for errors, compiles it, and runs it. I'd appreciate any links, repeats, etc. I apologize for such a bland, stupid question.

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• How to change order in ordered+persisted collection?

  - by Jaroslav Záruba

  I just need to change order of items in a (previously persisted) ordered collection... I tried simply passing the re-arranged collection to a setter: after committing a transaction the collection is gone. Then I tried to clear() the existing collection and addAll() afterwards: clear() makes persistent manager to mark all the elements as deleted. (But obviously I would like to be able to work with the collection items in the very transaction.) (The collection is not in a default fetch group, so I tried the above also with the named fetch group added into the fetch plan. No luck.) This must be the most stupid question, but I ran out of ideas and I'm stuck here two days already. I swear I googled. :(

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• Magento layout override!

  - by Farid

  Hi, I'm kind of new to the Magento, so forgive me for my stupid question! As I understand the whole concept of Magento is base on overriding the basic components that's are available with in the Magento. So based on my understanding I've decided to update the layout of onepage checkout in Magento. I've created my own layout and in the config file set that my layout updates the checkout module layout. But the problem is it's actually does not update the base layout, it replaces it self with base layout! Should it be act like this or am I wrong?!

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• UIImageView "Sprite Movement" How?

  - by Tate Allen

  Hi all, I am trying to make a game for the iPhone/iPod Touch. I am somewhat new to iPhone programming and extremely new to iPhone game programming so try to bear with me if this is a stupid question. How to I make my character, a UIImageView, move to the right or left, along the x axis. Just a simple translation across the screen. This is very frustrating so if you could link me to a tutorial or something like that, it would be much appreciated. Thanks in advance, Tate

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• How do I dynamically name objects in Java?

  - by hatboysam

  Let's say I needed to make a series of String[] objects. I know that if i wanted to make a string array called "test" to hold 3 Strings I could do String[] test = new String[3]; But let's say I needed to make a series of these arrays and I wanted them to be named, 1,2, 3, 4, 5... etc. For however many I needed and I didn't know how many I'd need. How do I achieve a similar effect to this: for (int k=0; k=5; k++){ String[] k = new String[3]; } Which would created 5 string arrays named 1 through 5. Basically I want to be able to create array objects with a name detemined by some other function. Why can't I seem to do this? Am I just being stupid?

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• jQuery Sparklines: $.getJSON data can't be read

  - by Bob Jansen

  I'm trying to generate a pie graph with Sparklines but I'm running into some trouble. I can't seem to figure out what I'm doing wrong, but I feel it is a silly mistake. I'm using the following code to generate a sparkline chart in the div #traffic_bos_ss: //Display Visitor Screen Size Stats $.getJSON('models/ucp/traffic/traffic_display_bos.php', { type: 'ss', server: server, api: api, ip: ip, }, function(data) { var values = data.views; //alert(values); $('#traffic_bos_ss').sparkline(values, { type: "pie", height: "100%", tooltipFormat: 'data.screen - {{value}}', }); }); The JSON string fetched: {"screen":"1220x1080, 1620x1080, 1920x1080","views":"[2, 2, 61]"} For some reason Sparklines does not process the variable values. When I alert the variable it outputs "[2, 2, 61]". Now the jQuery code does work when I replace the snippet: var values = data.views; with var values = [2, 2, 61]; What am I doing wrong?

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• Is there a way that I can hard code a const XmlNameTable to be reused by all of my XmlTextReader(s)?

  - by highone

  Before I continue I would just like to say I know that "Premature optimization is the root of all evil." However this program is only a hobby project and I enjoy trying to find ways to optimize it. That being said, I was reading an article on improving xml performance and it recommended sharing "the XmlNameTable class that is used to store element and attribute names across multiple XML documents of the same type to improve performance." I wasn't able to find any information about doing this in my googling, so it is likely that this is either not possible, a no-no, or a stupid question, but what's the harm in asking?

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• Reversing column values in mysql command line

  - by user94154

  I have a table posts with the column published, which is either 0 (unpublished) or 1 (published). Say I want to make all the published posts into unpublished posts and all the unpublished posts into published posts. I know that running UPDATE posts SET published = 1 WHERE published = 0; UPDATE posts SET published = 0 WHERE published = 1; will end up turning all my posts into published posts. How can I run these queries in the mysql command line so that it truly "reverse" the values, as opposed to the mistake outlined above? Thanks

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• PyDev and Django: how to restart dev server?

  - by Rosarch

  I'm new to Django. I think I'm making a simple mistake. I launched the dev server with Pydev: RClick on project Django Custom command runserver The server came up, and everything was great. But now I'm trying to stop it, and can't figure out how. I stopped the process in the PyDev console, and closed Eclipse, but web pages are still being served from http://127.0.0.1:8000. I launched and quit the server from the command line normally: python manage.py runserver But the server is still up. What am I doing wrong here?

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• Java: how to name boolean properties

  - by NoozNooz42

  I just had a little surprise in a Webapp, where I'm using EL in .jsp pages. I added a boolean property and scratched my head because I had named a boolean "isDynamic", so I could write this: <c:if test="${page.isDynamic}"> ... </c:if> Which I find easier to read than: <c:if test="${page.dynamic}"> ... </c:if> However the .jsp failed to compile, with the error: javax.el.PropertyNotFoundException: Property 'isDynamic' not found on type com... I turns out my IDE (and it took me some time to notice it), when generating the getter, had generated a method called: isDynamic() instead of: getIsDynamic() Once I manually replaced isDynamic() by getIsDynamic() everything was working fine. So I've got really two questions here: is it bad to start a boolean property's name with "is"? wether it is bad or not, didn't IntelliJ made a mistake here by auto-generating a method named isDynamic instead of getIsDynamic?

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• What's the ROI of using a build tool like ant or nant?

  - by leeand00

  To me this sounds like a really stupid question. Why would you not use a build tool? However, I need to explain my co-worker why he should be using a build tool of some sort. He's getting really into the idea of working as a team with more programmers, but he isn't understanding the bigger picture of what needs to change in the build process in order to work with a larger team; (i.e. defensive programming/unit testing your code, having a bug database, programming modular libraries, and using sub-repositories to store modules in version control. This is a rather large stack of technologies that I need to prove the ROI of...so I figured I'd start with the ROI of using a build tool rather than just...say...clicking compile.

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• DataGridView's SelectionChange event firing more than once on DataBinding

  - by Shantanu Gupta

  This Code triggers selection change event twice. how can I prevent it ? Currently i m using a flag or focused property to prevent this. But what is the actual way ? I am using it on winfoms EDIT Mistake in writing Question, here is the correct code that i wanted to ask private void frmGuestInfo_Load(object sender, EventArgs e) { this.dgvGuestInfo.SelectionChanged -= new System.EventHandler(this.dgvGuestInfo_SelectionChanged); dgvGuestInfo.DataSource=dsFillControls.Tables["tblName"]; this.dgvGuestInfo.SelectionChanged += new System.EventHandler(this.dgvGuestInfo_SelectionChanged); } private void dgvGuestInfo_SelectionChanged(object sender, EventArgs e) { }

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• Newbie PHP coding problem: header function (maybe, I need someone to check my code)

  - by Haskella

  Hi, consider the following PHP code: <?php $searchsport = $_REQUEST['sport']; $sportarray = array( "Football" => "Fb01", "Cricket" => "ck32", "Tennis" => "Tn43", ); header("Location: ".$sportarray[$searchsport].".html"); //directs user to the corresponding page they searched if ($searchsport == NULL) { header("Location: youtypednothing.html"); //directs user to a page I've set up to warn them if they've entered nothing } else { header("Location: sportdoesnotexist.html"); //if sport isn't in my root, a warning will appear } ?> I think the code comments are self-explanatory, basically when I type Tennis on my form.html it will send data to this php file and process and direct me to Tn43.html which is my tennis page. Unfortunately, it doesn't work and I really want to know why... (I know I've made some huge silly mistake). PS: Is header the right function to use when doing some redirecting?

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• Disallow using comma operator

  - by RiaD

  I never use the comma operator. But sometimes, when I write some recursions, I make a stupid mistake: I forget the function name. That's why the last operand is returned, not the result of a recursion call. Simplified example: int binpow(int a,int b){ if(!b) return 1; if(b&1) return a*binpow(a,b-1); return (a*a,b/2); // comma operator } Is it possible get a compilation error instead of incorrect, hard to debug code?

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• HOw I can verify my SQL / SQL Pl syntax

  - by rima

  Hi all Sorry my English is bad.I hope u can get what I want. I have lots of *.sql files that i want to write a program to compile them and if there is any issue(problem or mistake) report me. One of my friend write an IDE for java,as I remember he use javac to generate the codes error,in other hand maybe u see when u try to write code in a Visual stadio or Netbean the IDE generate errors for u.so now I want to know any one have any idea how I can do it for my sql files? In other mean I want to write a Editor for SQL files(PL/SQL) that compile my code and tell me what is my error. this problem raise up when I try to compile all of them in SQL PLUS,it's so boring. please help me...

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• how to modify this jquery syntax

  - by Gandalf StormCrow

  Hi all, this example below works when hover event is trigered and when its not, its working for elements already in DOM, but when element created dynamically it doesn't work, I realize I need to use jQuery live() or delegate() for this, the thing is I tried to modify it and its not producing the results as expected, here is the working code : $(".sidebar li").hover( function(){ $(this).css("background-color", "#F9F4D0"); $(this).append($('<button class="promoter" type="button" title="Active promotion"></button>')); }, function(){ $(this).css("background-color", "#F9FAFA"); $(this).children("button").remove(); } ); Here is the bit when I wanted to add live but it's not producing correct results : $(".sidebar li").live('hover', function(){ $(this).css("background-color", "#F9F4D0"); $(this).append($('<button class="promoter" type="button" title="Active promotion"></button>')); }, function(){ $(this).css("background-color", "#F9FAFA"); $(this).children("button").remove(); } ); Where did I made mistake, thank you

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• Help for a Sql statement

  - by stighy

  Hy at all, today is the day of ...question. I've a single table, with a relation master-detail like this: RecordID MasterID Field1 Field2 .... NrDetail 1 0 xxx yyyy 1 2 0 aaaa bbbb 2 3 1 hhhhh ssss 0 4 2 eee sssss 0 5 2 jjj hhhh 0 As you can see, NrDetail contain the total of "child record". Unfortunately, i've to create this field... and i would like to write it in my table. So my SQL question is: how to do this type of SQL to write the field NrDetail ? Something like: UPDATE table SET NrDetail= (SELECT COUNT(*) as Total FROM table WHERE MasterID= RecordID) But i think there's some mistake... Thank you in advance !

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• Converting an equation into a way java script can interpret it

  - by GeorgeTaylor

  So I have this code that is meant to do this equation: (1 / 15) * arccos(-tan(L) * tan(23.44 * sin(360 * (D + 284) / 365))) and for testing purposes alert it! But for some reason it returns "NaN". I've probably done something really stupid :P var now = new Date(); var start = new Date(now.getFullYear(), 0, 0); var diff = now - start; var oneDay = 1000 * 60 * 60 * 24; var d = Math.floor(diff / oneDay); var lat = position.coords.latitude; var long = position.coords.longitude; var tanlat = Math.atan(lat); var tantwentythree = Math.tan(23.44); var dayplus = d + 284; var sinday = Math.sin(360 * dayplus); var arccos = Math.acos(tanlat); var start = 1 / 15; var equation = start * arccos * tantwentythree * sinday / 365; alert(equation);

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• Put logic behind generated LinqToSql fields

  - by boris callens

  In a database I use throughout several projects, there is a field that should actually be a boolean but is for reasons nobody can explain to me a field duplicated over two tables where one time it is a char ('Y'/'N') and one time an int (1/0). When I generate a datacontext with LinqToSql the fields off course gets these datatypes. It would be nice if I don't have to drag this stupid choice of datatype throughout the rest of my application. Is there a way to give the generated classes a little bit of logic that just return me return this.equals('Y'); and return this==1; Preferably without having to make an EXTRA field in my partial class. It would be a solution to give the generated field a totally different name that can only be accessed through the partial class and then generate the extra field with the original name with my custom logic in the partial class. I don't know how to alter the accesibility level in my generated class though.. Any suggestions?

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• Program seems to get stuck ?

  - by Frank

  I have a Java program, I did some change and the strange thing is no matter what I do now, it will output the same result before my change, I looked into my system (Windows Vista), and clicked on "Generate a system health report", the result says : Symptom : A service is reported as having an unexpected error code Cause : One or more services has failed. The service did not stop gracefully, suggesting the service may have crashed or one of its components stopped in an unsupported way. Details : Service exited with code not equal to 0 or 1077 Resolution : Restart the service It doesn't say which service, and I defragmented my drives a few times, it still gave me the same report. I also checked my memory, it says no problem with ram. Everything else is ok, I re-started the windows a few times, got more free space on my C: drive, yet the Java program is still not responding to my new changes, unless I intentionally make a mistake, it gives me compile error, but if it can compile successfully, it still gives me the results before the change. What can I do to fix this ? Frank

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• SQL Server Import table keeping default values

  - by Chrissi

  I am importing a table from one database to another in SQL Server 2008 by right-clicking the target database and choosing Tasks Import Data... When I import the table I get the column names and types and all the data fine, but I lose the primary key, identity specifications and all the default values that were set in the source table. So now I have to set all the default values for each column again manually. Is there any way to get the default values with the import, or even after with a Query? I am VERY new to this and flailing in the dark, so forgive me if this is a really stupid question...

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• F# Interactive bug?

  - by John Reynolds

  I've tried the following code in VS2010: open System.Security.Cryptography let rsaTest1 = let ecKey = [|0uy..143uy|] // junk data for testing let ecKeyMod = ecKey.[8..8+128-1] let ecKeyExp = ecKey.[136..136+8-1] let rsa = RSAParameters(Modulus = ecKeyMod, Exponent = ecKeyExp) rsa let rsaTest2 = let ecKey = [|0uy..143uy|] // junk data for testing let rsa = RSAParameters(Modulus = ecKey.[8..8+128-1], Exponent = ecKey.[136..136+8-1]) rsa If I highlight all code and send it to F# Interactive (Alt+Enter), then rsaTest1 works, but rsaTest2 gives an error message, System.NullReferenceException: Object reference not set to an instance of an object. at <StartupCode$FSI_0004>.$FSI_0004.main@() in P:\proj\Tachograph\Project\CompuTachTest\CompuTachTest\rsaTest.fsx:line 16 However, if I change rsaTest2 from a value into a function and call it, let rsaTest2 () = let ecKey = [|0uy..143uy|] // junk data for testing let rsa = RSAParameters(Modulus = ecKey.[8..8+128-1], Exponent = ecKey.[136..136+8-1]) rsa let x = rsaTest2 () then there is no error. F# bug or my mistake?

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• Why many "normal" string in my flashlog file

  - by randy

  I suddenly find that there are many "normal" trace in my file flashlog.txt (supposed at your Window's location:{SysDrive}:\Documents and Settings{yourName}\Application Data\Macromedia\Flash Player\Logs). normal normal normal normal normal normal 1/10/2011 15:32:13.008 [INFO] org.spicefactory.parsley.core.view.impl.DefaultViewManager Add view root: null/flash.display::Stage normal normal normal But when I run the application with the FlashBuilder, the logging in the consul page is ok, it doesn't include any "normal" String. I am very confused by this, I thought that the output of the flashlog.txt file should be the same as that of the consul of FlashBuilder.And I don't think I have added such a stupid trace in my code. The question is how can I find out where these "normal" trace come from and how to remove it. This problem is resolved by restarting the computer as suggested.

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