workspace, package, crate, module in rust
Module Privacy mod outer { mod a { pub mod aa { } } fn b(){} } a是b的sibling，b可以使用a中的pub item（functions, methods, structs, enums, modules, and constant...
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python packaging
pip19开始支持pep517，pipenv最新版也支持。可以用pipenv安装poetry项目(https://github.com/python-poetry/poetry/issues/321)。pep517未明确editable install， 不能用-e参数；poetry自身支持
ch64: alternative io models
non-blocking io是基础，下边的几种模型，内部都是用nio进行的读写 nio就是 “return error” instead of “blocking”