cmdline.py 文件源码

def __call__(self, parser, namespace, values, option_string=None):
        try:
            with open(values) as fp:
                urls = [url.strip() for url in fp.readlines() if url]
        except IOError as e:
            raise argparse.ArgumentError(self, "Unable to read URL file: {}".format(e))

        setattr(namespace, self.dest, urls)