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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_publisher_doc(self):
 """Return a publish safe version of the frame's document"""

        with self.draft_context():
            # Select the draft document from the database
            draft = self.one(Q._uid == self._uid)
            publisher_doc = draft._document

            # Remove any keys from the document that should not be transferred
            # when publishing.
            self._remove_keys(publisher_doc, self._unpublished_fields)

        return publisher_doc