scope

问题 How can I change a global variable STOP to True ? As I understand, the problem is with the scope of other processes, but I don't know how to realize it. from multiprocessing import Pool from time import sleep STOP = False def get_nums(state, block_size): pages = [i for i in range(state*block_size + 1, (state + 1)*block_size + 1)] return pages def square(x): sleep(1) if x == 19: global STOP STOP = True print(f'squared\t{x}') return x*x if __name__ == '__main__': state = 0 result = [] while not

问题 I'm currently learning Rust, and am toying around with a simple calculator. When refactoring, I ended up with some code like the following: enum OptionalToken { Foo, Bar } fn next_token() -> OptionalToken { // Read input, classify, return OptionalToken::Foo } trait Stack { // ... fn dump (mut self); } impl Stack for Vec<f64> { // ... fn dump (mut self) { println!("Stack: size={} [", self.len()); for x in self.iter() { println!(" {}", x); }; println!("]"); } } fn main() { let mut stack: Vec

问题 I am passing a record in from the controller via: showDetail: function (list, record) { this.getMain().push({ xtype: 'leaddetail', data: record.data }); }, My View: Ext.define('ApexChat.view.LeadDetail', { extend: 'Ext.Panel', xtype: 'leaddetail', init: function() { debugger; }, config: { styleHtmlContent: true, scrollable: 'vertical', title: 'Details', frame: true, labelwidth: 75, items: [ { xtype: 'fieldset', columnWidth: 0.5, collapsible: true, title: 'Lead Information', defaultType:

问题 I have this code in a fiddle: var a = 1; function b() { var a = 10; alert(window.a); } b(); Why is a is undefined here? It's already defined in global namespace, i.e., window . (See the fiddle for an example of this unexpected behavior.) 回答1: If you're running this code in a fiddle that does not have the location set to "No wrap", or any circumstance in which you're not at the top-level scope, your outer a is not the global variable window.a . Consider a simple example where your code is

问题 I have a question about context. What is to proper way to deal with context in typescript? If I understand it correctly I have a problem with closures? When I'm calling a function inside a function, which is in object (class) then it's a closure right? But do I have to use self = this or is there a better way in typescript please? Because I really don't like this solution. And I don't want to bind every little thing. Example of what I'm tolkien about: export class SomeClass { private

问题 I'm having an issue with a variable not being passed through an ocanvas function. it appears that the variable is changing inside the function but isn't making it outside the function. here is my code: sonicSpeed2 = 0; sonicState2 = 0; canvas.bind("keypress", function () { var keys = canvas.keyboard.getKeysDown(); var x; sonicSpeed2 = 4; for (x = keys.length; x > 0; x--) { if (keys[x-1] == 16 && keys.length > 1) { sonicSpeed2 = 15; sonicState2 = 2; } if (keys[x-1] == 65) { sonicState2 = 1;

问题 Tried this code via source() f1 <- function(x, ...){ print(y) } f1(x = 1, y = 2) or this code via source() f1 <- function(x, ...){ y <- 2 f2(x, y = y, ...) } f2 <- function(x, ...){ print(y) } f1(x = 1) Got this Error Error in print(y) : object 'y' not found I guess the '...' argument takes from the global environment? 回答1: you should call y in your function as correct like this f1 <- function(x, ...){ l <- list(...) if(!is.null(l$y)) print(l$y) } f1(x = 1, y=2) 来源： https://stackoverflow.com

问题 I have deployed an axis2 web service on Tomcat 5.5. The web service functions as expected. But I noticed I was getting duplicated log entries. After researching it became clear that multiple instances of the class were being created - ie the first time it ran, one log entry; second time, two entries and so on. I added the scope="application" parameter, but that has not solved the problem. I added it both in the service tag and as a separate parameter tag to no avail. This class has many key

问题 I'm working on this problem and I got the answers : Statically: 13 Dynamically -deep binding: 2 <- i'm not sure about this one Dynamically -shallow binding: 2 <- i'm not sure about this one is that correct? Consider the program below (in a Pascal like language). What is the output of the language is statically scoped? What is the output of the language is dynamically scoped and uses deep binding? What is the output of the language is dynamically scoped and uses shallow binding? Program main;

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: Is it possible for a Perl subroutine to force its caller to return? I want to write a subroutine which causes the caller to return under certain conditions. This is meant to be used as a shortcut for validating input to a function. What I have so far is: sub needs($$) { my ($condition, $message) = @_; if (not $condition) { print "$message\n"; # would like to return from the *parent* here } return $condition; }