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cartesian product in pandas
...port DataFrame, merge
df1 = DataFrame({'key':[1,1], 'col1':[1,2],'col2':[3,4]})
df2 = DataFrame({'key':[1,1], 'col3':[5,6]})
merge(df1, df2,on='key')[['col1', 'col2', 'col3']]
Output:
col1 col2 col3
0 1 3 5
1 1 3 6
2 2 4 5
3 2 4 6
See here f...
高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术
...次起不需要再向Global Master查询group信息（缓存机制）；（4）保持和Global Slave的强一致性同步，保持自身健康状态并向全局的“心跳”服务验证自身的状态。
现在我们结合图来逐条解释上述工作，显然，这个系统的完整轮廓已经...
Replacement for “rename” in dplyr
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148
dplyr version 0.3 added a new rename() function that works just like plyr::rename().
df <- ...
How do I specify a password to 'psql' non-interactively?
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154
From the official documentation:
It is also convenient to have a ~/.pgpass file to avoid reg...
实战Nginx与PHP（FastCGI）的安装、配置与优化 - 更多技术 - 清泛网 - 专注...
...这里为了介绍PHP的FastCGI功能没有加入更多的编译选项。
4.配置与优化PHP-FPM
PHP的全局配置文件是php.ini，在上面的步骤中，已经将此文件复制到了/usr/local/php/lib/php.ini下。可以根据每个应用需求的不同，对php.ini进行相应的配置。...
Why is Multiple Inheritance not allowed in Java or C#?
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143
The short answer is: because the language designers decided not to.
Basically, it seemed that ...
Most efficient way to remove special characters from string
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'echo' without newline in a shell script
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answered Jun 25 '12 at 16:42
Keith ThompsonKeith Thompson
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NSIS做的安装程序，可接受命令行参数，实现静默安装，静默卸载 - 更多技术 ...
...in the script.
/S runs the installer or uninstaller silently. See section 4.12 for more information.
/D sets the default installation directory ($INSTDIR), overriding InstallDir and InstallDirRegKey. It must be the lastparameter used in the command line and must not contain any quotes, even if the...
wandbox：C++在线编译项目源码编译及原理剖析 - 开源 & Github - 清泛网 - ...
...核心代码在kernel2中，安装步骤也在里面的 README.md 中。
4、编译安装：
cd kennel2
./cmake.sh
cd /home/qpzhou/sources/wandbox/kennel2/_build/release
make install
具体参考项目README.md，持续更新。
虽然功能强大，源码相对还是比较简单的，...