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This makes it possible to always use the function like this without having to worry to accidentally close a standard stream:: with open_file(filename) as f: ... .. versionadded:: 3.0 :param filename: the name of the file to open (or ``'-'`` for stdin/stdout). :param mode: the mode in which to open the file. :param encoding: the encoding to use. :param errors: the error handling for this file. :param lazy: can be flipped to true to open the file lazily. :param atomic: in atomic mode writes go into a temporary file and it's moved on close. )rB)r<r rb)rHr?r@rAZlazyrBfrDrrr open_file5s rvcCs&trtrttkrtStjddS)aThis returns the argument part of sys.argv in the most appropriate form for processing. What this means is that this return value is in a format that works for Click to process but does not necessarily correspond well to what's actually standard for the interpreter. On most environments the return value is ``sys.argv[:1]`` unchanged. 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