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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 execute(self, argv=None):
 """ Executes command based on given arguments. """

        if self.completion:
            self.autocomplete()
        parser = self.get_parser()
        namespace = parser.parse_args(argv)
        if hasattr(namespace, 'func'):
            self.run_command(namespace)