try-catch

问题 I'm trying to make a function that checks for an integer and will keep looping until the user correctly enters an integer of 17 or higher. However, if I put in wrong input, like 'K', or '&', it will get stuck in an infinite loop. public static int getAge(Scanner scanner) { int age; boolean repeat = true; while (repeat) { try { System.out.println("Enter the soldier's age: "); age = scanner.nextInt(); repeat = false; } catch(InputMismatchException exception) { System.out.println("ERROR: You

问题 from selenium import webdriver import time browser = webdriver.Chrome('C:/Users/acer/Desktop/chromedriver') browser.get('website') def user(): while True: time.sleep(1) try: browser.find_element_by_id('q').send_keys('name') #Type in name browser.find_element_by_tag_name('button').click() #Click "verify" finally: browser.find_element_by_tag_name('button').click() #When connection times out, click "try again" user() #When connection times out again run "while loop" from the begining I want to

问题 from selenium import webdriver import time browser = webdriver.Chrome('C:/Users/acer/Desktop/chromedriver') browser.get('website') def user(): while True: time.sleep(1) try: browser.find_element_by_id('q').send_keys('name') #Type in name browser.find_element_by_tag_name('button').click() #Click "verify" finally: browser.find_element_by_tag_name('button').click() #When connection times out, click "try again" user() #When connection times out again run "while loop" from the begining I want to

问题 I have insufficient knolwedge on the use of tryCatch() but have found it hard to find a good solution in the ongoing discussions. I have a self-programmed function which returns an object. It is actually a list object, but for simplicity assume it is a scalar. I am using a for() loop to bootstrap this function. My loop is of the following form: boot<-1000 for(i in 1:boot){ bootstrap_data<-data[sample(nrow(data),nrow(data),replace=T),] out[i]<-myfunction(bootstrap_data,X,...) } myfunction()

问题 I came across code which I somehow find 'odd'. var = None try: var = mydict[a][b] except: pass I'm not very comfortable with using try-except for checking dict key, when obviously there is an if-else sequence to handle the same situation. var = None if a in mydict: if b in mydict[a]: var = mydict[a][b] Is there any 'obvious' advantage/disadvantage of using one approach over the other? 回答1: Exception handling is generally much slower than an if statement. With the presence of nested

问题 I am using jQuery to change the URL hash when I click on the navigation button. But when I scroll using the mouse wheel the URL won't change. How can I do that? How can it be done using window.history.pushState(“object or string”, “Title”, “/new-url”); I am not able to understand it. Please help my javascript code $j(document).ready(function () { $j("#start1").click(function (e) { e.preventDefault(); var section = this.href, sectionClean = section.substring(section.indexOf("#")); $j("html,

问题 I am using jQuery to change the URL hash when I click on the navigation button. But when I scroll using the mouse wheel the URL won't change. How can I do that? How can it be done using window.history.pushState(“object or string”, “Title”, “/new-url”); I am not able to understand it. Please help my javascript code $j(document).ready(function () { $j("#start1").click(function (e) { e.preventDefault(); var section = this.href, sectionClean = section.substring(section.indexOf("#")); $j("html,

问题 I am using jQuery to change the URL hash when I click on the navigation button. But when I scroll using the mouse wheel the URL won't change. How can I do that? How can it be done using window.history.pushState(“object or string”, “Title”, “/new-url”); I am not able to understand it. Please help my javascript code $j(document).ready(function () { $j("#start1").click(function (e) { e.preventDefault(); var section = this.href, sectionClean = section.substring(section.indexOf("#")); $j("html,

问题 I'm running a command in Powershell through VSTS to affect Azure. The command works, but it gives an error after. The params and connection are working as evidenced by the fact that the group gets permission from the command. I figure a workaround is to put the command in a try block, have it run, and then when the error comes up go to the catch block and end without throwing the error. When I run this script, I still get the same error, like the try block is ignored. Do I have the syntax

问题 I'm running a command in Powershell through VSTS to affect Azure. The command works, but it gives an error after. The params and connection are working as evidenced by the fact that the group gets permission from the command. I figure a workaround is to put the command in a try block, have it run, and then when the error comes up go to the catch block and end without throwing the error. When I run this script, I still get the same error, like the try block is ignored. Do I have the syntax