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上下文管理 文件IO操作可以对文件对象使用上下文管理，使用with……as语法。 with open("test") as f: pass 仿照上例写一个自己的类，实现上下文管理。 class Point: pass with Point() as p: pass 结果为： --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) <ipython-input-1-77f0ac1b02c7> in <module> 2 pass 3 ----> 4 with Point() as p: 5 pass AttributeError: __enter__ 提示属性错误，没有__exit__，看了需要这个属性。 上下文管理对象 当一个对象同时实现了 __enter__()和__exit__()方法，它就属于上下文管理对象。 __enter__()：进入于此相关的上下文。如果存在该方法，with语法会把该方法的返回值作为绑定到as子句中指定的变量上。 __exit__：退出与此对象相关的上下文。 class Point: def __init__(self): print("init") def _

I want to search a special keyword in Instagram. For example, I want to search this word:"fast food". I can send this key in search box. But, when I use submit method in Selenium by Python3, it doesn't work and give me error. This is my code: from selenium import webdriver from selenium.webdriver.common.keys import Keys from selenium.webdriver.common.alert import Alert from selenium.webdriver.support.ui import WebDriverWait as wait from selenium.webdriver.support import expected_conditions as EC import time driver = webdriver.Firefox() url="https://www.instagram.com/p/pTPI-kyX7g/?tagged

created(){ window.addEventListener('keydown', this.handleKeyDown, true)//开启监听键盘按下事件 } 在methods中当keyCode的值为13触发登录绑定的事件即可 // 登录登录登录 async changeUser () { // 消息提示只弹出一个框 this.$message.closeAll() let s = checkPhone(this.dlPhone, 1) // 手机号 if (s.code === 500) { this.$message(s.msg) return } let ss = checkPhone(this.dlPassword, 2) // 密码 if (ss.code === 500) { this.$message(ss.msg) return } // if (s.code == 200 && ss.code == 200) { let res = await this.$http.post('/api/login', { mobile: this.dlPhone, password: this.dlPassword }) if (res.data.code === 200) { this.show = 2 this.$store.commit('CHANGE

How to press Enter using Selenium RC using C#? I am working with a SearchBox using Selenium . In which I have to type some name and I have to press Enter to search. There is no Submit button. So, I must use Enter . I tried something like this selenium.KeyPress("quicksearchtextcriteria", "13"); But doesn't work. Please Help. Note: I made a collection of possible ways to do this. See here: press enter key in selenium This can be achieved by Keys , and Enter . Example in Java as I don't know C#: import org.openqa.selenium.Keys; //... // this sends an Enter to the element selenium.type("locator",

I need to detect when someone hits "enter" in text inputs with a specific class. My jQuery is as follows: $('input.large').keypress(function (e) { if(e.which ==13) console.log("pressed enter"); }); My HTML is something like this: <tr><td> Personal Name </td></tr> <tr><td> <input type='text' class='large'> </td></tr> <tr><td> Email</td></tr> <tr><td> <input type='text' class='large'> </td></tr> When I've given the fields IDs and tried $('#elementid').keypress it worked. But this isn't working. I get no console output. What am I missing? You can use live ( .on() ) events in document with keydown

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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a option dialog like this: String[] options = ["Yes", "No"]; //button names int n = JOptionPane.showOptionDialog(singleFrameService.getFrame(), "Some Question?", "", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, //do not use a custom Icon options, //the titles of buttons options[0]); //default button title //if press yes if (n == JOptionPane.YES_OPTION){ //make some if pressed Yes } When I used mouse and press Yes/No - all work fine... But when I start use keyboard, press TAB to go to "No" button, and then press ENTER

I would like to know how to execute a command inside a screen session. i searched and I found this : screen -S nameofscreen -X stuff "command" When I type this, the command is typed inside the screen but it is not executed. So my queston is how to press enter using this command. In the bash shell you can use ctrl-V to explicitly put non-printable characters into a string. So try ctrl-V ctrl-L ctrl-V ctrl-M at the end of your command just before the " . In bash, you can use \n in the $'...' construct: screen -S nameofscreen -X stuff $'command\n' I'd do something like this: screen -S sessionName