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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_default_options(self):
 """Get a dictionary of default options as used with run. Returns ------- dict A dictionary containing option keys of the form '--beat_interval'. Their values are boolean if the option is a flag, otherwise None or its default value. """

        _, _, internal_usage = self.get_usage()
        args = docopt(internal_usage, [])
        return {k: v for k, v in args.items() if k.startswith('--')}