methods

问题 the method is: def printa(x): return x the response is: self.response.out.write(template.render(path, {'printa':printa})) the html is: {{ printa 'sss'}} I want to show 'sss' in my page , so how to do this , updated I create a templatetags folder, and 2 py file: templatetags |--------__init__.py |--------tags.py in tags.py is: #from django import template from google.appengine.ext.webapp import template register = template.Library() def printa(): return 'ssss' register.simple_tag(printa) the

问题 I am developing an Agent class for an evolutionary algorithm. I need to add a method to it that is generated from a string inherited from the parents. Here a minimal example class Agent: def __init__(self, s='\tif x > y:\n\t\treturn 1'): self.f_template = f'def f(self, x,y):\n{s}' I would like to have the method self.f(self, x,y) having self.f_template as a function body. I know I could add it later doing: A = Agent() exec(A.f_template) A.f = partial(f, A) >>> A.f(3,2) 1 But is it possible to

问题 I have an issue about coding logic here. I have to generate an array of Boolean, based on percentage. To clarify, I got a percentage 'X' (int value) and I want to generate a array of Boolean which is composed ox X percents of 1, randomly distributed. Moreover, the length of the array is constant. For example, I I want to generate my array of Boolean, based on X=40, I would have: [0,1,0,1,0,0,0,0,1,1,0,0,1,0,0,1,1,0,1,0] I did not managed to find any easy solution or an existing function to

问题 Imagine I have this code: public void Foo() { // Do bar work // Do baz work // Do foobar work } And I realize I can (and should because it was doing more than one thing) refactor it into: public void Foo() { bar(); baz(); foobar(); } private void bar() { /* do bar work */ } private void baz() { /* do baz work */ } private void foobar() { /* do foobar work */ } But then I realize I will never use these functions outside of Foo() , so those functions are just cluttering the main page and the

问题 I have been coding up Java with Netbeans for about a year now, and have written a lot of data manipulation code which plots graphs on-screen. I generally plant a JPanel object in my main window, write custom painting code, and call the repaint() method as needed. But today, for the first time, I tried to invoke a repaint on a panel from a class (object) other than the one that contained the panel. Although the compiler found nothing wrong with this, and in debugging mode, it single-stepped

问题 Since I'm unable to add a .vb code-behind file to my .aspx page, as delineated here, I'm trying to add the method "inline" like so (the "ConvertSubcategoryIndex" function is the new bit of code): <% . . . If Request.Form.Item("Action") = "Save" Then . . . .Parameters.Add("@Subcategory", SqlDbType.NVarChar).Value = ConvertSubcategoryIndex(Category, Subcategory) . . . End If 'If Save Action Function ConvertSubcategoryIndex(_Category As String, _Subcategory As Int32) As String If _Category =

问题 Now, I know that this has been asked, but I need to know how to do this NOT on html or anything. Heres my code, not including all of the other java files. package rtype; import java.awt.Image; import java.awt.event.KeyEvent; import java.util.ArrayList; import javax.swing.ImageIcon; public class aa { private int xd; private int yd; private int dx; private int dy; private int x; private int y; private Image image; private ArrayList missiles; private final int CRAFT_SIZE = 70; public aa() {

问题 This is general programming, but if it makes a difference, I'm using objective-c. Suppose there's a method that returns a value, and also performs some actions, but you don't care about the value it returns, only the stuff that it does. Would you just call the method as if it was void? Or place the result in a variable and then delete it or forget about it? State your opinion, what you would do if you had this situation. 回答1: A common example of this is printf, which returns an int... but you

问题 I've been coding a text adventure game. On game start, Menu(string Choice, bool takenDump) is called. There are several few other methods that have different scenarios that the user can run into, such as a pokemon encounter and such. If the user dies, then they restart at Menu(), meaning it is called again from within itself. Is there any way to avoid this? Source of program 回答1: As long as there is a condition to exit the loop, there's no problem. If there's not, you basically have an

问题 This question already has answers here : how to throw an IOException? (7 answers) Closed 6 years ago . Code: catch (IOException e) { LOGGER.error("IOException exception happened"); //now need throw again the same exception to be //catched in the upper method } But when I try simply: catch (IOException e) { LOGGER.error("IOException exception happened"); //now need throw again the same exception to be //catched in the upper method throw e; } Eclipse supposes to me put "throw e" in try catch