global

Python: Difference between 'global' & globals().update(var)

由 寵の児 提交于 2020-01-12 03:20:48
问题 What is the difference between initializing a variable as global var or calling globals().update(var) . Thanks 回答1: When you say global var you are telling Python that var is the same var that was defined in a global context. You would use it in the following way: var=0 def f(): global var var=1 f() print(var) # 1 <---- the var outside the "def f" block is affected by calling f() Without the global statement, the var inside the "def f" block would be a local variable, and setting its value

C++ static local function vs global function

由 大城市里の小女人 提交于 2020-01-11 17:18:29
问题 What is the utility of having static functions in a file ? How are they different from having global functions in a file ? static int Square(int i) { return i * i; } vs int Square(int i) { return i * i; } 回答1: What is the utility of having static functions in a file? You can use these functions to provide shared implementation logic to other functions within the same file. Various helper functions specific to a file are good candidates to be declared file-static. How are they different from

is there a way to access a non-global shadowed variable in javascript

由 馋奶兔 提交于 2020-01-11 10:41:13
问题 I'm currently learning javascript scope and was just wondering whether it is possible to access a non-global shadowed variable in javascript? i.e. in the example below, the variable a that equal to 10 in the aFunc function var a = 1; function aFunc(){ var a = 10; function innerFunc(){ var a = 100; console.log("innerFunc a = " + a); console.log("is it possible to access outer function's a variable?"); console.log("global a = " + window.a); } innerFunc(); } aFunc(); ps - I understand naming

is there a way to access a non-global shadowed variable in javascript

由 主宰稳场 提交于 2020-01-11 10:41:09
问题 I'm currently learning javascript scope and was just wondering whether it is possible to access a non-global shadowed variable in javascript? i.e. in the example below, the variable a that equal to 10 in the aFunc function var a = 1; function aFunc(){ var a = 10; function innerFunc(){ var a = 100; console.log("innerFunc a = " + a); console.log("is it possible to access outer function's a variable?"); console.log("global a = " + window.a); } innerFunc(); } aFunc(); ps - I understand naming

How to save/restore global variables in android even when os kill application

由 泪湿孤枕 提交于 2020-01-10 19:40:38
问题 In android,Google recommends us to save the global variables in Application. But there is a problem, if the android os kill the application because of low of memory, the application will be re-oncreate and the global variables I saved will be lost. I don't know when to save/restore these variables,application doesn't give us some methods such as onsaveinstancestate()/onrestoreinstancestate(). I have one idea but I can't make sure it can work well. I see some app will go to slashScreen when os

How to access global variables

由 此生再无相见时 提交于 2020-01-09 18:58:29
问题 How do I access a variable that was declared/init in my main.go in a different .go package/file? Keeps telling me that the variable is undefined (I know that global variables are bad but this is just to be used as a timestamp) in main.go var StartTime = time.Now() func main(){...} trying to access StartTime in a different .go file but keep getting StartTime undefined 回答1: I would "inject" the starttime variable instead, otherwise you have a circular dependency between the packages. main.go

global variables in php not working as expected

由 自作多情 提交于 2020-01-09 06:46:17
问题 I'm having trouble with global variables in php. I have a $screen var set in one file, which requires another file that calls an initSession() defined in yet another file. The initSession() declares global $screen and then processes $screen further down using the value set in the very first script. How is this possible? To make things more confusing, if you try to set $screen again then call the initSession() , it uses the value first used once again. The following code will describe the

Mute the global sound in Android

由 天大地大妈咪最大 提交于 2020-01-09 03:21:27
问题 Is there a method that can be used to mute the global sound from an application button? 回答1: They make it more complicated than it has to be. You can just use AudioManager.setStreamMute(). Feel free to use the code below. //mute audio AudioManager amanager=(AudioManager)getSystemService(Context.AUDIO_SERVICE); amanager.setStreamMute(AudioManager.STREAM_NOTIFICATION, true); amanager.setStreamMute(AudioManager.STREAM_ALARM, true); amanager.setStreamMute(AudioManager.STREAM_MUSIC, true);

Magento 2.0

由 大憨熊 提交于 2020-01-07 15:33:12
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Overview Accept payments in Magento 2 using the Alipay Cross-border Website Payment Gateway. Advanced & deeply integrated by Alipaymate.com (Certified Alipay Open Platform Developer) Detail This extension allows you to accept payments made via the Cross-border Website Payment gateway of Alipay. The extension supports all of the 16 currencies, and Fully support CNY(RMB) price for checkout. It is easily installed in your shop, without having to make any changes to the source code. Features Use Alipay Asynchronous Notification to ensure order status consistent

What does printf print for an unitialized variable?

由 孤街浪徒 提交于 2020-01-07 08:55:08
问题 What should the code print? 0 or any garbage value or will it depend on the compiler? #include <stdio.h> int a; int main() { printf("%d\n",a); return 0; } 回答1: the answer is 0. Global variables are initialized to zero. 回答2: I would say your code might output anything or simply anything can happen because your code invokes Undefined Behaviour as per C99. You don't have a prototype for printf in scope. J.2 Undefined behavior — For call to a function without a function prototype in scope where
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