<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_list_columns(self):
 """ Returns the sharepoint list columns """


        url = self.build_url(self._endpoints.get('get_list_columns'))

        response = self.con.get(url)

        if not response:
            return []

        data = response.json()

        return [self.list_column_constructor(parent=self, **{self._cloud_data_key: column})
                for column in data.get('value', [])]