infinite

问题 Is there something like an "infinite dictionary" in Python? More precisely, is there something where - i can put in values like in a dictionary, - but maybe also a function which tells me how to map a key to a value, - and maybe also something that maps a key to a (finite) set of keys and then gives the corresponding value? Formulated in another way, what I want to have is the following "thing": I initialize it in a way (give values, functions, whatever) and then it just gives me for each key

问题 My function below will occasionally produce an infinite number. I had thought that I could use my rounding function below to avoid using the infinite number...in other words 1.333333333333(INF) rounded to 1.33, however the compiler still treats the result of the INF.rounded as infinite, how can I round so that I can still put out a value here? Speficially I'm trying to encode to JSON and getting this error: metadata ERROR = invalidValue(inf, Swift.EncodingError.Context(codingPath: [Watch

问题 First of all this is a homework problem. I finished the program, and it runs fine; but I have a little side problem. The program is supposed to first read a txt file online, and gather all 50 states and their abbreviations. Next, I have to ask the user to enter in a valid state abbreviation. Once they do that, I have to read another txt file online, and return the two senators for their state. The problem I'm having is that I want to loop the scanner asking the user to enter a state. If they

问题 im using a jquery plugin for infinite scrolling, and its working perfectly except for the client side scripts that need to run. my infinite scrolling script is: <script type="text/javascript"> $('.infinite-container').waypoint('infinite', { container: 'auto', items: '.infinite-item', more: '.infinite-more-link', offset: 'bottom-in-view', loadingClass: 'infinite-loading', onBeforePageLoad: $.noop, onAfterPageLoad: $.noop }); </script> what i think i need to do is somehow call my server side

问题 I'm trying to figure out infinite scroll with history and pagination, as recommended by google, https://googlewebmastercentral.blogspot.in/2014/02/infinite-scroll-search-friendly.html John Mueller's demo does exactly what I want, but I can't figure out how/where the data is being loaded. http://scrollsample.appspot.com/items I copied page source and js and css, but of course the source is for the particular "page" it happens to be on. Everything just points to the /items directory and the

问题 I've written a program to bounce a ball around a screen. The program as written below does not work (the ball just moves off screen). However if I declare the boolean variables atHorizontalEdge and atVerticalEdge inside the while loop, it seems to work. Why is that the case? As the booleans are defined for the entire run() method, shouldn't it be callable by the while loop even though its outside the while loop? import acm.program.*; import acm.graphics.*; import java.awt.*; public class

问题 I have code which runs a wait action for a duration of columnTime and then runs a block of code. This results in the block running once, then wait time, then block, then wait time, etc. func startSpawning(){ print(columnTime) let wait = SKAction.waitForDuration(columnTime) let block = SKAction.runBlock({[unowned self] in self.spawnObstacle()}) let sequence = SKAction.sequence([wait, block]) runAction(SKAction.repeatActionForever(sequence), withKey: "spawning") } //startSpawning I want the

问题 I'm trying to overload the >>operator for a Date class in c++ but the it goes in infinite loop when the run goes into the first if statement, can you please help me? //operator istream& operator >>(istream& is,CustomDate& d){ int day,month,year; char ch1,ch2; string test; is>>skipws>>day>>ch1>>month>>ch2>>year; if(!is){ is.clear(ios_base::failbit); return is; } if(ch1!='/' || ch2!='/') error("invalid date input"); d = CustomDate(day,month,year); return is; } This is the function that calls it

问题 I am creating a game, and it requires an infinite number of Rectangles. For example, let's say I name the variables car: public Rectangle car1; public Rectangle car2; public Rectangle car3; and so on, Would there be an easier way? Like: public int carNumber; public Rectange car + carNumber;//if carNumber was one, it would be called car1 Also, I will need to test if the rectangles contain others. <-- I know how to do this. 回答1: You can't and shouldn't try to declare an infinite number of

问题 I have console application in which I am doing sqldependency. My problem is when I set commandType as Text, it is working fine. But if I use commandType as StoredProcedure, onchange method is calling infinitely. Please see the code below: static DataSet myDataSet; static SqlConnection connection; static SqlCommand command; static void Main(string[] args) { // Remove any existing dependency connection, then create a new one. string connstr = "Data Source=XYZ;Initial Catalog=Dev;Integrated