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有一些任务，可能事先需要设置，事后做清理工作。对于这种场景，Python的with语句提供了一种非常方便的处理方式。一个很好的例子是文件处理，你需要获取一个文件句柄，从文件中读取数据，然后关闭文件句柄。

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装go

因为 ubuntu 默认装 go 是1.6 的, 不想装 1.6, 准备装 1.8,

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参考

https://skyao.gitbooks.io/learning-etcd3/content/installation/linux_single.html

下载/配置

简而言之就是 : 先去 etcd 的 github找到他的release, 然后复制链接, 下载然后配置

注： 以 etcd-v3.2.1 为例，后续更新版本时可能细节有所不同。

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boost.python 迟暮, 久违 pybind11 , 来玩玩

官方介绍

pybind11 is a lightweight header-only library that exposes C++ types in Python and vice versa, mainly to create Python bindings of existing C++ code. Its goals and syntax are similar to the excellent Boost.Python library by David Abrahams: to minimize boilerplate code in traditional extension modules by inferring type information using compile-time introspection.

The main issue with Boost.Python—and the reason for creating such a similar project—is Boost. Boost is an enormously large and complex suite of utility libraries that works with almost every C++ compiler in existence. This compatibility has its cost: arcane template tricks and workarounds are necessary to support the oldest and buggiest of compiler specimens. Now that C++11-compatible compilers are widely available, this heavy machinery has become an excessively large and unnecessary dependency.

编写供 python 调用的 C++ 模块

下载好 pybind11 之后，我们就可以开始对着官方的 pybind11 Tutorial 进行学习了，详细的入门教程及语法请参考官方文档，这里，我们简单演示下如何编写供 python 调用的 C++ 模块.

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