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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 post(self, ddata, url=SETUP_ENDPOINT, referer=SETUP_ENDPOINT):
 """Method to update some attributes on namespace."""

        headers = HEADERS.copy()
        if referer is None:
            headers.pop('Referer')
        else:
            headers['Referer'] = referer

        # append csrftoken
        if 'csrfmiddlewaretoken' not in ddata.keys():
            ddata['csrfmiddlewaretoken'] = self._parent.csrftoken

        req = self._parent.client.post(url, headers=headers, data=ddata)
        if req.status_code == 200:
            self.update()