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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If the positional argument is a mapping object, return a dictionary mapping the same keys to the same values as does the mapping object.

如果位置参数是一个映射对象，则返回像映射对象一样的键值映射。

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If the positional argument is a mapping object, return a dictionary mapping the same keys to the same values as does the mapping object.

如果位置参数是一个映射对象，则返回像映射对象一样的键值映射。

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