<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def run(self):
 """Parse the script file. :rtype: :py:class:`~turberfield.dialogue.model.Model` """

        model = Model(self.fP, self.doc)
        self.doc.walkabout(model)
        return model