How to concatenate two lists in Python?

How to concatenate two lists in Python?

How do I concatenate two lists in Python?Example:listone = [1, 2, 3]listtwo = [4, 5, 6]Expected outcome:>>> joinedlist[1, 2, 3, 4, 5, 6] 1:Python makes this ridiculously easy. You can use the + operator to combine them:listone = [1,2,3]l

What exactly do “u” and “r” string flags do, and what are raw string literals?

What exactly do “u” and “r” string flags do, and what are raw string literals?

While asking this question, I realized I didn't know much about raw strings. For somebody claiming to be a Django trainer, this sucks.I know what an encoding is, and I know what u alone does since I get what is Unicode.But what does r do ex

Passing Parameters JavaFX FXML

Passing Parameters JavaFX FXML

How can I pass parameters to a secondary window in javafx? Is there a way to communicate with the corresponding controller?For example:The user chooses a customer from a TableView and a new window is opened, showing the customer's info.Stag

What does a “Cannot find symbol” compilation error mean?

What does a “Cannot find symbol” compilation error mean?

Please explain the following about the "Cannot find symbol" error:What does this error mean?What things can cause this error?How does the programmer go about fixing this error?This question is designed to be a comprehensive question about "

Hibernate: Dirty Checking and Only Update of Dirty Attributes?

Hibernate: Dirty Checking and Only Update of Dirty Attributes?

In the "good old JDBC days" I wrote a lot of SQL code that did very targeted updates of only the "attributes/members" that were actually changed:For example, consider an object with the following members:public String name;public String add

Javascript Proxy support in Babel

Javascript Proxy support in Babel

I'm using babelify version 6.3.0 set to stage 0. ES6 / ES7 are working great. However when I try to use Javascript's proxy functionality:set product(product={}) { this._product = new Proxy({}, {})}I get:ReferenceError: Can't find variabl

How to properly cascade delete managed objects in Core Data?

How to properly cascade delete managed objects in Core Data?

I have a Core Data model which has three entities: A, B, and C. A has a one-to-many relationship with B, and B has a many-to-many relationship with C. The delete rule for A -> B is "Cascade", and B -> A is "No Action". The delete rule for B

Why does Visual Studio disable the media buttons?

Why does Visual Studio disable the media buttons?

I've got iTunes running and the media buttons on my computer work with it. I've installed mmkeys.dll which has been recommended for making iTunes work with media keys in the background and it works fine with all apps - firefox, thunderbird,

Is there any documented free R-Tree implementation for .NET?

Is there any documented free R-Tree implementation for .NET?

I found some open source R-Tree implementations in C#, but none with documentation nor signs of being used by someone else than the developer. 1:The NetTopologySuite is a JTS port to C# and it contains a STRtree class which is a read-onl

NetFx40_LegacySecurityPolicy in design-time mode

NetFx40_LegacySecurityPolicy in design-time mode

Is there any way to make legacy design-time code execute with NetFx40_LegacySecurityPolicy switched on?More specificaly, is there any way to make DevExpress 8.2 winforms designer work in VisualStudio 2010?I got errors due to this issue and

Routing to the actions with same names but different parameters

Routing to the actions with same names but different parameters

I have this set of routes: routes.MapRoute( "IssueType", "issue/{type}", new { controller = "Issue", action = "Index" } ); routes.MapRoute( "Default", // Route name

When does a dictionary throw an IndexOutOfRangeException on Add or ContainsKey?

When does a dictionary throw an IndexOutOfRangeException on Add or ContainsKey?

On a busy ASP .NET website, I have a Dictionary, which acts as a cache, basically storing key/value pairs for later retrieval.On high load, the Dictionary some times get into a state, where it always throws an IndexOutOfRangeException whene

CoreData: “Dangling reference to an invalid object.” error

CoreData: “Dangling reference to an invalid object.” error

I'm working on a Cocoa-Touch app, it uses CoreData and has some NSPersistentObject subclasses generated by the XCode model editor.I've noticed that recently, when saving the context I get an error which has as user info the following part:(

Why doesn't C have binary literals?

Why doesn't C have binary literals?

I am frequently wishing I could do something like this in c:val1 &= 0b00001111; //clear high nibbleval2 |= 0b01000000; //set bit 7val3 &= ~0b00010000; //clear bit 5Having this syntax seems like an incredibly useful addition to C with no dow

Image rounded corners in QML

Image rounded corners in QML

To my surprise, the Image component has no radius property. I tried emulating the rounded corners by putting the image in a rounded Rectangle, but it does not clip the corners.Rectangle { anchors.right: rectContentBg.left anchors.top:

jstack - well-known file is not secure

jstack - well-known file is not secure

I am running tomcat 5.5 on x86_64 CentOS 5.7 using 32-bit Oracle Java 1.6.0.JVM process used by tomcat has 6421 pid. Tomcat is working fine.When run jstack it fails with:[[email protected] ~]# jstack 64216421: well-known file is not secureTo get a

Failed to clear temp storage

Failed to clear temp storage

Failed to clear temp storage: It was determined that certain files are unsafe for access within a Web application, or that too many calls are being made on file resources. SecurityErrorI'm getting this error in console. I have a script name

iOS 8 removing build from review in iTunesConnect

iOS 8 removing build from review in iTunesConnect

I just uploaded a new build to the iTunesConnect in preparation for the iOS 8 release. The app status is "Waiting For Review". However, I want to reject the uploaded binary and upload a new one. According to Apple docs (section: Removing a

Response.Redirect occasionally ignores URL encoding

Response.Redirect occasionally ignores URL encoding

In the website I'm currently building we need a large number of dynamic redirects, in order to maintain flow through parts of the site.I'm currently using response.redirect to achieve this, with the redirection URL being dynamically generat

PDF Manipulation on iPhone SDK

PDF Manipulation on iPhone SDK

I have been reading Apple's docs and they recommend using UIWebView. This is all well and good until you want to go to a page number and also search PDF's.Is there any 3rd Party libraries, (free or paid) that do this at all? As a minimum

ImageMagick Install Windows

ImageMagick Install Windows

I am trying to install ImageMagick on Windows. What I did is install Windows RailsInstaller created my version and now I need to use ImageMagick but for some reason it doesn't work.I took the binary source code and install and run it from t

What is the overhead in splitting a for-loop into multiple for-loops, if the total work inside is th

What is the overhead in splitting a for-loop into multiple for-loops, if the total work inside is th

This question already has an answer here: Why are elementwise additions much faster in separate loops than in a combined loop? 9 answers Pe

If my url contains route parameters, then hash links reroute in angular

If my url contains route parameters, then hash links reroute in angular

If I have a one level route, then the hash links work as expected with no rerouting. However I have some urls that are country/kh and if I try using hash tags such as country/kh#projects, the page reroutes, which is very annoying.So, if im

What is fastest way to convert bool to byte?

What is fastest way to convert bool to byte?

What is fastest way to convert bool to byte?I want this mapping: False=0, True=1Note: I don't want to use any if statements or other conditional statements. I don't want the CPU to halt or guess next statement.Update:For those who want to s

IOError: [Errno 22] invalid mode ('wb') or filename:

IOError: [Errno 22] invalid mode ('wb') or filename:

I keep getting the following error. IOError: [Errno 22] invalid mode ('wb') or filename: 'C:\\Users\\Viral Patel\\Documents\\GitHub\\3DPhotovoltaics\\Data_Output\\Simulation_Data\\Raw_Data\\Raw_Simulation_Data_2014-03-24 17:21:20.5450