The Hello object has no method or member object called world, so the world portion of the URL is passed in as a positional argument to that object's default method.

对象Hello没有叫做world的方法或者成员对象，所以这个URL的world部分作为那个对象的default方法的位置参数被传递进来。

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Command-line arguments are also called positional parameters, because the position of an argument on the command line is usually semantically important.

命令行参数也称为位置参数(positional parameter)，因为某个参数在命令行上的位置通常在语义上非常重要。

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Return a new dictionary initialized from an optional positional argument or from a set of keyword arguments.

返回一个新的由可选的位置参数或一组关键字参数初始化的字典。

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