string-interpolation

问题 Although Django Django does not yet support Python 3, it eventually will, so I want to keep my code the more "future-proof" possible. Since Python 2.7 the string interpolation operator ( % ) is being deprecated. And I realized that every string that needs to be translated is using the % interpolation syntax. And in the Django docs there is no mention of the new str.format method (the "new" official way of string formatting)... Maybe there is a limitation of the gettext library, but I don't

问题 In MVC 6 source code I saw some code lines that has strings leading with $ signs. As I never saw it before, I think it is new in C# 6.0. I'm not sure. (I hope I'm right, otherwise I'd be shocked as I never crossed it before. It was like: var path = $"'{pathRelative}'"; 回答1: You're correct, this is a new C# 6 feature. The $ sign before a string enables string interpolation. The compiler will parse the string specially, and any expressions inside curly braces will be evaluated and inserted into

问题 What protocol do I have to implement to control the way an object is represented within a string interpolation in Swift? I wan't to specify what get's printed in something like this: struct A{ } var a = A() println("\(a)") 回答1: You need to implement the Printable protocol: This protocol should be adopted by types that wish to customize their textual representation. This textual representation is used when objects are written to an OutputStreamType . protocol Printable { var description:

问题 I'm trying to implement a custom string interpolation method with a macro and I need some guidance on using the API. Here is what I want to do: /** expected * LocatedPieces(List(("\nHello ", Place("world"), Position()), ("\nHow are you, ", Name("Eric"), Position(...))) */ val locatedPieces: LocatedPieces = s2""" Hello $place How are you, $name """ val place: Piece = Place("world") val name: Piece = Name("Eric") trait Piece case class Place(p: String) extends Piece case class Name(n: String)

问题 I am trying to make a simple link to google maps with a dynamic address inserted into the href field. I have tried the code below plus tons of other messing around with no luck. How do you interpolate a dynamic ember string in a handlebars href field? I am using ember,rails, and handlebars. I know how to use bindAttr if I had the entire url stored with my model but I only have the address. Putting the google url with every model seemed unnecessary if i could just call it once in the view. <h1

问题 C# 6.0 brings this nifty new formatting operation indicated by a $ Instead of doing this String lastName = "Doena"; String firstName = "DJ"; Console.WriteLine(String.Format("{1} {0}", lastName, firstName)); you can do this Console.WriteLine($"{firstName} {lastName}"); But what about number formats. What if I have this: Decimal price = 9999.95m; Decimal freebie = 0; const String format = "#,##0.##"; Console.WriteLine(String.Format("{0:" + format + "}\t{1:" + format + "}", price, freebie)); I

问题 Short and simple. Does the new string interpolation in C# 6.0 rely on reflection? I.e. does string myStr = $"Hi {name}, how are you?"; use reflection at runtime to find the variable "name" and its value? 回答1: No. It doesn't. It is completely based on compile-time evaluation. You can see that with this TryRoslyn example that compiles and decompiles this: int name = 4; string myStr = $"Hi {name}, how are you?"; Into this: int num = 4; string.Format("Hi {0}, how are you?", num); string

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . I'd like to end up with the string "/a_setting/c\blah = something" where attribute gets evaluated to its value: blah. However, I'm seeing the following behavior where the preceding backslash seems to stop the evaluation of the variable: attribute = "blah" "/a_setting/c\#{attribute} = something" =>

问题 In Angular2, why if i put a property in a simple view, like this: <span>{{allowServer}}</span> it change whenever its value change on its .ts file, and if i put it like this: <button class="btn btn-primary" disabled={{allowServer}} >server</button> the button doesn't get the new value disabled? So, what is the rule for which I have to use interpolation instead of binding syntax? [disabled]=allowServer 回答1: [prop]="value" is for object binding to properties (@Input() of an Angular component or

问题 AKA Template Literals, String Interpolation. (Wiki here.) Why are they useful? When should I not use them? How are these features similar and different from using JSX with React? How can I use String.raw() effectively as mentioned in the bottom of the wiki? 回答1: The string templating (or string interpolation) feature is ubiquitous in many programming languages. You should use it when you have a distinct or recurring template that you wish to fill in with the variables in current scope. It