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How to toggle a value in Python
...0
>>> x ^= 1
>>> x
1
The technique generalizes to any pair of integers. The xor-by-one step is replaced with a xor-by-precomputed-constant:
>>> A = 205
>>> B = -117
>>> t = A ^ B # precomputed toggle constant
>>> x = A
>>> x ^...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
...这个故事就取自文章前一部分），国内也有很不错的翻译版本，可以自行在Google搜索“twitter的创始人可能都还在玩泥巴”。
而我最信任的wikipedia大神在SMS的词条中提到，“it was necessary to limit the length of the messages to 128 bytes (later...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
... to implement multitouch: Rotation Detector
Xinyue Deng dengxinyue0420@gmail.com
DRAFT (March 6, 2016): Building extensions requires the App Inventor extensions capability, which is not yet incorporated into the App Inventor release. But you can try some ofary AI2 server.
You can implement the...
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
...MIOwKb3tFzqq_IGmpnrwZYeL9rqSr8LDVRva
这个是描述ORALCE 11G以前的版本。我通过在ORALCE 主机上事实监控端口发现全部都是从1521端口出去，并且结合网上的一些帖子。判断在ORACLE 11G在linux上是不存在端口随机的问题。
第三个说法，PL/SQ...
Heroku NodeJS http to https ssl forced redirect
...u Cedar stack, and ExpressJS ~3.4.4, here is a working set of code.
The main thing to remember here is that we ARE deploying to Heroku. SSL termination happens at the load balancer, before encrypted traffic reaches your node app. It is possible to test whether https was used to make the request wi...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网 - 专注IT技能提升
.... 有两种实现方法,第一种方法是判断nginx核心变量host(老版本是http_host)：
server {
server_name www.jefflei.com jefflei.com ;
if ($host != 'www.jefflei.com' ) {
rewrite ^/(.*)$ http://www.jefflei.com/$1 permanent;
}
...
}
第二种方法：
server {
server_name jef...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网 - 专注IT技能提升
.... 有两种实现方法,第一种方法是判断nginx核心变量host(老版本是http_host)：
server {
server_name www.jefflei.com jefflei.com ;
if ($host != 'www.jefflei.com' ) {
rewrite ^/(.*)$ http://www.jefflei.com/$1 permanent;
}
...
}
第二种方法：
server {
server_name jef...