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• Using Variables for Class Names in Python?

  - by Sam McAfee

  I want to know how to use variables for objects and function names in Python. In PHP, you can do this: $className = "MyClass"; $newObject = new $className(); How do you do this sort of thing in Python? Or, am I totally not appreciating some fundamental difference with Python, and if so, what is it?

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• commands executing in piping in UNIX

  - by Happy Mittal

  when I write a command $ echo date then it prints "date" as it is i.e it doesn't run date program. But when I write $ echo date | wc then correct answer is produced as if date was run. How piping is making difference here ? Please explain.

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• Confused about type conversion in C++

  - by Venkats

  In C++, the following lines have me confused: int temp = (int)(0×00); int temp = (0×00int); What is the difference between those 2 lines?

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• Update one list from another

  - by lacqui

  I have two multi-select lists in HTML - one of categories, and another of items. What I want is that, when an item selected in the "category" list, everything in the "items" list from that category is also selected. For example, if "Categories" contains "Animal", "Mineral", and "Vegetable", and "Items" contains "Dog", "Cat", "Monkey", "Diamond", "Granite", "Carrot", "Tomato": If "Animal" is selected in one list, "Dog", "Cat", and "Monkey" should be selected; any other selections should remain as they are. I'm using a Symfony PHP backend on the server, if that makes any difference

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• MailMessage Question/Confusion

  - by j-t-s

  Using this: MailMessage mm = new MailMessage(); What is the difference between: mm.Sender = sender; and mm.From = from; ? Thank you

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• Communication between Activities: Intent or Service: what is faster?

  - by Sebi

  Is there a significant difference in time needed for sending data over a service or by using an intent? Are there general advices when to use service and when to use intents?

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• differences between socket and port in database context

  - by Yang

  hi guys, when i am using 'localhost' as the host for mysql database, sequel pro alert me that i will be using socket, if i am using '127.0.0.1', i am actually using the ip address and port 3306 to locate the server. is there any difference?

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• Better to use an OR or an AND when checking for NULLs in C if statements?

  - by Crazy Chenz

  Came across a line in OpenSSL that made me do a double take... if (!*pos) return NULL; if (!*pos || ((*pos)->flags == FLAGS)) return blah; Is there a (performance/security/concurrecy) difference in doing that instead of: if (!*pos) return NULL; if (*pos && ((*pos)->flags == FLAGS)) return blah; Thanks, Chenz

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• I am working with Visual Studio 2008. Actually there is References folder missing

  - by Azhar

  I am working with Visual Studio 2008. Actually there is References folder missing in its solution explorer. When I create a New web Application it has References folder but when I add new .aspx file it also adds .aspx.designer.cs file with it and its does not show master page option in add dialogue. but in the old web application it shows the master page option where master page file is already added. whats the difference between these two solutions.

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• Why would you need a slash at the end of a URL?

  - by Daniel

  Is there a difference between these URLs in regards to having slashes at the end of the URL? https://drchrono.com/about_us https://drchrono.com/about_us/ Do web frameworks and web servers (e.g. Apache, Nginx, Django) handle these requests differently?

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• Differences in the different ways to make concurrent programs

  - by dotnetdev

  Hi, What is the difference between: Starting a new thread Using TPL Using BackgroundWorker All of these create concurrency but what are the low-level differences between these? Do all 3 make threads anyway? Thanks

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• Shallow copy versus Deep Copy of user defined types.

  - by Codenotguru

  what is the difference between a shallow copy and deep copy with respect to user defined types and why do we need to perform a deep copy during copy construction for user defined types??

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• Dynamically resizing CFWINDOW to fit content

  - by Ryan French

  Hi all, Am currently working on a site that uses a lot of cfwindow objects and I was wondering if anyone knows of a way to dynamically resize the window so that all the content fits in without the need for scroll bars. I have tried using the overflow=visible configuration but it doesnt seem to make a difference. Thanks in advance for any advice.

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• Comment Starting with /*!

  - by Phonethics

  My editor (geany) changes the comment colour when the comments starts with /*! Whats the difference between /* ... */ and /*! ... */

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• How to stop Powershell insisting on one dash in parameters?

  - by Julian Birch

  It seems that somebody has subtly changed the way that parameter switches are parsed on powershell. On some machines "split-path c:\x\y --parent" works. On some it fails. Can anyone tell me a) what causes the difference and b) how can I stop it?

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• grails mockFor closure wierdness

  - by hvgotcodes

  Right, so when I set up my mock using the testing plugin's mockFor method, I expect a method that returns null. If I do myControl.demand.theMethod {return null} in the debugger, the value that I set the 'theMethod' call result to is some closure in the debugger. If I do myControl.demand.theMethod {->return null} the value is null, as expected. I dont understand the difference....

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• Bouncy Castle provider don't work in Linux Ubuntu

  - by Tom Brito

  I've successful installed Bouncy Castle in a Windows environment, but the same steps isn't working for Linux Ubuntu (V9.04). Does anyone know any difference from installing Bouncy Castle in Windows and Linux? Or any bug with Bouncy Castle in Linux Ubuntu 9.04?

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• Reflection: different ways to retrieve property value

  - by jules

  I'm retrieving an IEnumerable list of properties via following code: BindingFlags bindingFlag = BindingFlags.Instance | BindingFlags.Public; var dataProperties = typeof(myParentObject).GetProperties(bindingFlag); Then I'm iterating through the list and retrieving the value for each property. I've come across two different approaches to doing this, and just wondered what the difference is between them: 1) object propertyValue = property.GetGetMethod().Invoke(myObject, null); 2) object propertValue = property.GetValue(myObject, null)

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• Which DateTime module is best for manipulating an XML date and time

  - by justintime

  I am trying to parse a date from a GPX (XML track format) that looks like 2009-08-02T12:11:06Z My initial approach was to use DateTime::Format::RFC3339 But DateTime:Format::XSD seems to do a similar job. Is there a difference between the applicability of these modules.

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• Why does this eval not work in Ruby

  - by Anil

  Can you explain this? I want to eval values and calculations from two different sources. One source gives me the following info(programmatically): 'a = 2' The second source gives me this expression to evaluate: 'a + 3' This works: a = 2 eval 'a + 3' This also works: eval 'a = 2; a + 3' But what I really need is this, and it doesn't work: eval 'a = 2' eval 'a + 3' I would like to understand the difference, and how can I make the last option work. Thanks for your help.

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• Python `if x is not None` or `if not x is None`?

  - by orokusaki

  I've always thought of the if not x is None version to be more clear, but Google's style guide implies (based on this excerpt) that they use if x is not None. Is there any minor performance difference (I'm assuming not), and is there any case where one really doesn't fit (making the other a clear winner for my convention)?* *I'm referring to any singleton, rather than just None. ...to compare singletons like None. Use is or is not.

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• C# Lambda expression syntax, is brackets necessary?

  - by DevNovice

  I'm new in C# and earlier I saw the lambda expression is like (params) = { expression;} but in LINQ, I saw examples like IEnumerable customerFirstNames = customers.Select(cust = cust.FirstName); No brackets. Are they the same or is there any difference? Thanks a lot.

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• Creating instance in java class

  - by aladine

  Please advise me the difference between two ways of declaration of java constructor public class A{ private static A instance = new A(); public static A getInstance() { return instance; } public static void main(String[] args) { A a= A.getInstance(); } } AND public class B{ public B(){}; public static void main(String[] args) { B b= new B(); } } Thanks

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• Example of xargs' -x option in action

  - by Ole Tange

  GNU xargs has option '-x'. The man page says: -x Exit if the size (see the -s option) is exceeded. But xargs seems to not care if -x is set or not. I have been unable to make an example in which the -x has any effect at all. Please provide two examples in which the only difference is an added -x and that produce different output.

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• #pragma once Versus #if !defined MYHEADER_INCLUDED_

  - by bdhar

  What is/are the differences (in performance/usability/functionality) in using #pragma once and #if !defined MYHEADER_INCLUDED_ constructs? Or what is the difference between the two?

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