有层次的模块名字：当模块名字包含一个或多个小数点时，模块的搜索路径执行起来有所不同。
Hierarchical module names: when the module names contains one or more dots, the module search path is carried out differently.
这意味着也会搜索所找到的项目的模块引用和类路径。
This means that the module references and class path of the project that's found are also searched.
该选项指定附加目录路径到Python模块搜索路径的开始的地方。
This specifies additional paths directories which are inserted into the beginning of Python's module search path.
这么做将会丢失对真正的模块搜索路径列表对象的引用，同时指向了一个新创建的对象，而这个对象将不会其任何作用。
All that does is lose the reference to the actual node module lookup paths, and create a new reference to some other thing that isn't used for anything.
这么做将会丢失对真正的模块搜索路径列表对象的引用，同时指向了一个新创建的对象，而这个对象将不会其任何作用。
All that does is lose the reference to the actual node module lookup paths, and create a new reference to some other thing that isn't used for anything.
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