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Understanding the map function
...oop
ys = []
for x in xs:
ys.append(x * 2)
n-ary map is equivalent to zipping input iterables together and then applying the transformation function on every element of that intermediate zipped list. It's not a Cartesian product:
xs = [1, 2, 3]
ys = [2, 4, 6]
def f(x, y):
return (x * 2, y...
阿里的线下野心 - 资讯 - 清泛网 - 专注C/C++及内核技术
阿里的线下野心线上零售的头把交椅，显然不能满足阿里帝国的野心，马云的生态圈也加速向地面蔓延。日前，阿里旗下实体商业O2O平台喵街宣布与银泰、王府井
线上零售的头把交椅，显然不能满足阿里帝国的野心，马云的...
写出高质量代码的10个Tips - 更多技术 - 清泛网 - 专注C/C++及内核技术
...重构对于代码质量的重要性不言而喻，反正我是很难一次把代码写得让自己满意、无可挑剔，《重构》这本书作为业内经典也理应人人必读，也有其他类似的教授重构技巧的书，有些也非常不错，遗憾的是我发现很多工作多年的...
Get yesterday's date in bash on Linux, DST-safe
...
Here a solution that will work with Solaris and AIX as well.
Manipulating the Timezone is possible for changing the clock some hours.
Due to the daylight saving time, 24 hours ago can be today or the day before yesterday.
You are sure that yesterday is 20 or 30 hours ago...
当ORACLE 11G 遇到 JUNIPER 防火墙 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
....16.110.70/24 直连ORALCE 数据库。
然后使用端口映射软件 把172.16.100.70 的1521映射到172.16.110.102的1521端口
配置
Tnsnames.ora 文件
使用PL/SQL 连接本机的IP地址 登陆查询一切正常。
由此判断 问题不是出在跨网段等问题，...
What MySQL data type should be used for Latitude/Longitude with 8 decimal places?
...NT column (2D datatype) with a SPATIAL index.
CREATE TABLE `cities` (
`zip` varchar(8) NOT NULL,
`country` varchar (2) GENERATED ALWAYS AS (SUBSTRING(`zip`, 1, 2)) STORED,
`city` varchar(30) NOT NULL,
`centre` point NOT NULL,
PRIMARY KEY (`zip`),
KEY `country` (`country`),
KEY `city`...
谁在争抢UGC - 资讯 - 清泛网 - 专注C/C++及内核技术
...是一种用户使用互联网的新方式，即由原来的以下载为主变成下载和上传并重。YouTube、MySpace等网站都可以看做是UGC的成功案例，社区网络、视频分享、博客和播客(视频分享)等都是UGC的主要应用形式。
UGC正在成为互联网领域被...
Open a link in browser with java button? [duplicate]
...nix()
{
return OS.contains("nix") || OS.contains("nux") || OS.indexOf("aix") > 0;
}
Then we can call this helper from the instance:
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
MUtils.openURL("www.google.com"); // just what is the...
How is mime type of an uploaded file determined by browser?
I have a web app where the user needs to upload a .zip file. On the server-side, I am checking the mime type of the uploaded file, to make sure it is application/x-zip-compressed or application/zip .
...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网 - 专注IT技能提升
...令
nginx的rewrite相当于apache的rewriterule(大多数情况下可以把原有apache的rewrite规则加上引号就可以直接使用)，它可以用在server,location 和IF条件判断块中,命令格式如下：
rewrite 正则表达式替换目标flag标记
flag标记可以用以下几...