Hierarchical module names: when the module names contains one or more dots, the module search path is carried out differently.
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。
The first is the search path, used to determine which module (and which struts-config.xml file) to use.
第一条是搜索路径，用来确定使用哪个模块(和struts - config . xml文件)。
This specifies additional paths directories which are inserted into the beginning of Python's module search path.
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。
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