asterisk

在KeyPress事件中写入 private void txtBoxKeyPress(object sender, KeyPressEventArgs e) { if ((e.KeyChar >= 'a' && e.KeyChar <= 'z') || (e.KeyChar >= 'A' && e.KeyChar <= 'Z')|| (e.KeyChar >= '0' && e.KeyChar <= '9') || (e.KeyChar == 8)) { e.Handled = false; } else { e.Handled = true; } } KeyCode其他值 keycode 8 = BackSpace BackSpace keycode 9 = Tab Tab keycode 12 = Clear keycode 13 = Enter keycode 16 = Shift_L keycode 17 = Control_L keycode 18 = Alt_L keycode 19 = Pause keycode 20 = Caps_Lock keycode 27 = Escape Escape keycode 32 = space space keycode 33 = Prior keycode 34 = Next keycode 35 = End keycode

问题： This question already has an answer here: 这个问题已经在这里有了答案： What does ** (double star/asterisk) and * (star/asterisk) do for parameters? **（双星号/星号）和*（星号/星号）对参数有什么作用？ 19 answers 19个答案 asterisk in function call 3 answers 函数调用中的星号 3个答案 What does the * operator mean in Python, such as in code like zip(*x) or f(**k) ? * 运算符在Python中的含义是什么，例如 zip(*x) 或 f(**k) ？ How is it handled internally in the interpreter? 在解释器内部如何处理？ Does it affect performance at all? 它会影响性能吗？ Is it fast or slow? 是快还是慢？ When is it useful and when is it not? 什么时候有用，什么时候没有？ Should it be used in a function declaration or in a call?

add by zhj: 文章写的很好，适合初学者 原文： https://www.netguru.com/codestories/nginx-tutorial-basics-concepts Introduction Hello! Sharing is caring, so we'd love to share another piece of knowledge with you. We prepared a three-part nginx tutorial. If you already know something about nginx, or if you'd just like to expand your experience and understanding - this is the perfect place for you! We will tell you how nginx works, going through the concepts behind it, how you can optimise it to boost your app's performance, and how to get it up and running quickly. This tutorial will have three parts: Basics

今天分享一个有关shell编程中由通配符引起的问题。 1. 问题代码 cat test.logs 4567890 * ##*************************************## rtyuio**tyuio432 ##*************************************## *rtyuiop*2* yuiop ##*************************************## rtyuiop(3 * 4)iuytr ##*************************************## 8765432 cat script.sh #!/usr/bin/env bash # 主要功能是将 非##开头 的每行记录写入到文件中，每个文件保存一行记录 logsname=test.logs i=100 while read line do if [[ $line =~ '##' ]];then ((i++)) else echo $line >> $i.txt fi done < "${logsname}" 运行script.sh脚本的结果： 从图片上 红框部分 可以看到： 4567890 * 被替换为 4567890 script.sh test.logs rtyuiop(3 * 4)iuytr 被替换为

问题： This question already has answers here : 这个问题已经在这里有了答案 ： What does ** (double star/asterisk) and * (star/asterisk) do for parameters? **（双星号/星号）和*（星号/星号）对参数有什么作用？ (19 answers) （19个回答） Closed 6 years ago . 6年前 关闭。 So I have difficulty with the concept of *args and **kwargs . 所以我很难理解 *args 和 **kwargs 的概念。 So far I have learned that: 到目前为止，我已经了解到： *args = list of arguments - as positional arguments *args =参数列表-作为位置参数 **kwargs = dictionary - whose keys become separate keyword arguments and the values become values of these arguments. **kwargs =字典-其键成为单独的关键字参数，而值则成为这些参数的值。 I don't understand