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• scoping problem in recursive closure

  - by wiso

  why this work: def function1(): a = 10 def function2(): print a function2() but this not: def function1(): a = 10 def function2(): print a a -= 1 if a>0: function2() function2() error: UnboundLocalError: local variable 'a' referenced before assignment

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• assign a xaml file in a frame source dynamically

  - by ashishtripathi.hcu

  I have this code in a xaml file now in a event handler code i want to assign a xaml file in a frame source dynamically the code in xaml file is .. here this assignment of source is working but how to do that in a .cs file. ProjectTab.Sourse=???

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• `var = something rescue nil` behaviour

  - by JP

  In ruby you can throw a rescue at the end of an assignment to catch any errors that might come up. I have a function (below: a_function_that_may_fail) where it's convenient to let it throw an error if certain conditions aren't met. The following code works well post = {} # Other Hash stuff post['Caption'] = a_function_that_may_fail rescue nil However I'd like to have post['Caption'] not even set if the function fails. I know I can do: begin post['Caption'] = a_function_that_may_fail recsue end but that feels a little excessive - is there a simpler solution?

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• Trying to write a loop that uses an OutputStream to write to a text file.

  - by Steve McLain

  I'm not a java programmer, I'm a VB programmer. I am doing this as part of an assignment, however, I'm not asking for help on something assignment related. I'd like to figure out how to get the OutputStreamWriter to work properly in this instance. I just want to capture the values I'm generating and place them into a text document. The file is generated, but only one entry exists, not the 40 I'm expecting. I could do this in a heartbeat with VB, but java feels very strange to me right now. Your help is appreciated. Thanks, Steve Here's the code: public static void main(String[] args){ long start, end; double result,difference; try {//OutputStream code assistance from http://tutorials.jenkov.com/java-io/outputstreamwriter.html OutputStream outputStream = new FileOutputStream("c:\\Temp\\output1.txt"); Writer out = new OutputStreamWriter(outputStream); for(int n=1; n<=20; n++){ //Calculate the Time for n^2. start = System.nanoTime(); //Add code to call method to calculate n^2 result = mN2(n); end = System.nanoTime(); difference = (end - start); //Output results to a file out.write("N^2 End time: " + end + " Difference: " + difference + "\n"); out.close(); } } catch (IOException e){ } try { OutputStream outputStream = new FileOutputStream("c:\\Temp\\output1.txt"); Writer out = new OutputStreamWriter(outputStream); for(int n=1; n<=20; n++){ //Calculate the Time for 2^n. start = System.nanoTime(); //Add code to call method to calculate 2^n result = m2N(n); end = System.nanoTime(); difference = (end - start); //Output results to a file out.write("N^2 End time: " + end + " Difference: " + difference + "\n"); out.close(); } } catch (IOException e){ } } //Calculate N^2 public static double mN2(double n) { n = n*n; return n; } //Calculate 2N public static double m2N (double n) { n = 2*n; return n; }

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• When where and how can i change the __class__ attr of an object in Python?

  - by Juanjo Conti

  I'd like to be able to do: >>> class a(str): ... pass ... >>> b = a() >>> b.__class__ = str Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: __class__ assignment: only for heap types

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• close button only for some tabs in Qt

  - by Costy

  Hello, I am using Qt for an assignment I have for college, and I want to use QTabWidget to display a chat window much like Pidgin's. I want to make the "group chat" tab always open and impossible to close and the rest of the "private channel" tabs closable. QTabWidget's setTabsClosable(bool) is not helping ... any ideas? ty

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• One-liner to determine who wins in Rock, Paper, Scissors

  - by asmeurer

  So I am writing a simple Rock, Paper, Scissors game in C (it's for an assignment by the way, though the main thing is to learn sockets. Also, I suspect it will be due before I get a good answer). I have it setup as Rock=0, Paper=1, and Scissors=2. Is there an easy one-liner to determine who wins? I tried playing around with it on paper, but I couldn't figure out any patterns.

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• What are the Jena methods used to access an ontology?

  - by amoosh

  Hello I'm new to ontologies, my assignment is to create an ontology using Protege V4.0.2, (which I've done) and to create a website over that ontology(which I'm working on), i just need the basics on how to search the ontology using the Jena library I dont have any specifics because i haven't yet started. but i'm in a time crunch, and i need to now exactly how i'm goning to do it

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• What programming languages/platforms are suitable for writing to a database?

  - by matt

  I'm working on a class assignment that involves reading an XML document and inserting the contents into a database. Language choice is wide open - so I figure, why not consider all my options! What languages are able and appropriate for working with databases?

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• Regular Expression question

  - by Mohammad Kotb

  Hi, In my academic assignment, I want make a regular expression to match a word with the following specifications: word length greater than or equal 1 and less than or equal 8 contains letters, digits, and underscore first digit is a letter only word is not A,X,S,T or PC,SW I tried for this regex but can't continue (My big problem is to make the word not equal to PC and SW) ([a-zA-Z&&[^AXST]])|([a-zA-Z][\w]{0,7}) But in the previous regex I didn't handle the that it is not PC and SW Thanks,

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• Good use of recursivity in chess programming?

  - by JDelage

  Hi, As part of a homework assignment, I have to program a simple chess game in Java. I was thinking of taking the opportunity to experiment with recursion, and I was wondering if there's an obvious candidate in chess for recursive code? Thank you, JDelage

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• How can a new hire/intern make a good impression?

  - by Tristan

  In a week I start at my first real programming internship for a multinational company, I want to know, aside from "hard work" what can I do to prepare for this? How do I be a good new employee? (FYI, my first assignment is to help the team with "enhancements to our test driver to automate our regression testing" on an air traffic control system written in ADA)

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• Vim replacing tabs with double spaces

  - by oxinabox.ucc.asn.au

  So I've written some code of an assignment and i forgot the universities polocy of indent with 2spaces. Normally I'ld have put a: vim: ts=2:tw=2: et: at the top of my files, but this time i forgot. How should I go about replacing all tabs with 2 space? would s// work? (repalcing and with the respectiove characters.

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• Doxygen dependencies to manage during install

  - by aCuria

  Hi, i am supposed to document my code with doxygen for a homework assignment, but i have problems getting doxygen to run. I have a Doxyfile provided, and have just installed doxygen on my machine. When i enter the command to run doxygen, "doxygen Doxyfile" I get the following error: failed to run html help compiler on index.hhp can anyone clue me into what i am doing wrong? Thanks

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• How can I show characters for an ASP.net password textbox control after assigning its .Text property

  - by Rob Segal

  I am assigning a value to .Text of a textbox retrieved from a database in Page_Load() but no characters are shown in the textbox after doing this. The value is indeed there when I try to read from it after the assignment. I would like to present some characters to the user even though they are the "dotted" password characters so they know a password has been entered here. Is it possible to do this?

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• Passing window handler for the SFML

  - by Ockonal

  Hello, I'm using SFML Input system for my own application. Here is my code: size_t windowHnd = %MY_WINDOW_HANDLER%; sf::Window MyWindow(windowHnd); const sf::Input& MyInput = MyWindow.GetInput(); cannot convert ‘sf::Window’ to ‘size_t’ in assignment In official documentation I found sf::Window constructor signature: WindowHandle Handle What is the correct way to pass window handler for the SFML?

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• How to add a margin to a CheckedListBox in .NET?

  - by Xanatos

  I'm writing an windforms application using .NET (actually IronPython, but that's not relevant), and I have a CheckedListBox object in my GUI. It's working fine, it has about 20 items in a multicolumn layout. But I can't figure out how to give the thing a nice internal margin--I want to insert around 20 or 30 pixels of whitespace around the top, bottom, left, and right edges of the checkboxes. To be clear, I want the whitespace to appear between the border of the CheckedListBox and the Checkboxes inside it, not outside the whole component. Hopefully this is an easy answer, and I'm just missing it cause I'm new to programming in windows. If its not possible, I guess that'd be good to know too, so I don't waste anymore time with it. (If I were doing this in Swing (Java) I would be looking to set the Insets on my component, or maybe build up a compound border with some empty space in it.)

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• Why does std queue not define a swap method specialisation

  - by Jamie Cook

  I've read that all stl containers provide a specialisation of the swap algorithm so as to avoid calling the copy constructor and two assignment operations that the default method uses. However, when I thought it would be nice to use a queue in some code I was working on I noticed that (unlike vector and deque) queue doesn't provide this method? I just decided to use a deque instead of a queue, but still I'm interested to know why this is?

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• What kind of events should be created for a CRUD application?

  - by Mohit Deshpande

  I have an application that is centered around a database (ORM is LINQ-SQL) that has a table called Assignment. I am using the repository pattern to manipulate the database. My application is basically going to perform CRUD operations. I am new to delegates and events and I am asking you what events I should create (like maybe AssignmentCreating, AssignmentCreated) and what kind of delegate to use (like maybe a custom delegate or just an EventHandler)?

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• Is it good practice to generally make heavyweight classes non-copyable?

  - by Emile Cormier

  I have a Shape class containing potentially many vertices, and I was contemplating making copy-constructor/copy-assignment private to prevent accidental needless copying of my heavyweight class (for example, passing by value instead of by reference). To make a copy of Shape, one would have to deliberately call a "clone" or "duplicate" method. Is this good practice? I wonder why STL containers don't use this approach, as I rarely want to pass them by value.

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• VS debugging and watching a variable for changes

  - by Shawn Mclean

  I have a property inside a class that is getting changed by something. The only place I change the value of this code is a line that looks like this: pushpin.Position.Altitude = -31; During visual studio debugging, is there a way to watch .Altitude for any changes made, preferably it breaks at the assignment statement that changes the value. If this is the correct way to track down this problem, could I have a step-by-step tutorial/instruction on how to do this? Thanks.

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• Oracle Database introduction and literature

  - by Marco Nätlitz

  Hi folks, got an new assignment covering Oracle databases. My problem now is that I am completely new to the Oracle system and never worked with it before. I need to develop a concept covering the installation and configuration of the server. Afterwards I need to migrate the old server to the new while ensuring date consistence. I just wanted to ask if you guys have some useful links for introduction and of course good literature / books on this topic? Thanks and cheers from Cologne Marco

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• assigning a list in python

  - by mekasperasky

  pt=[2] pt[0]=raw_input() when i do this , and give an input suppose 1011 , it says list indexing error- " list assignment index out of range" . may i know why? i think i am not able to assign a list properly . how to assign an array of 2 elements in python then?

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• C readline function

  - by nunos

  In an assignment for college it was suggested to use the c readline function in an exercise. I have searched for its reference but still haven't found it. Does it really exist? In which header? Can you please post the link to the reference? Thanks.

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• What is the most efficient way to determine if a directed graph is singly connected?

  - by zebraman

  I am working on an assignment where one of the problems asks to derive an algorithm to check if a directed graph G=(V,E) is singly connected (there is at most one simple path from u to v for all distinct vertices u,v of V. Of course you can brute force check it, which is what I'm doing right now, but I want to know if there's a more efficient way. Could anyone point me in the right direction?

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