code: def write_docstring_for_shortcut(self):
          
          # cursor placed below function definition
          result = self.get_function_definition_from_below_last_line()
          if result is not None:
              __, number_of_lines_of_function = result
              cursor = self.code_editor.textCursor()
              for __ in range(number_of_lines_of_function):
                  cursor.movePosition(QTextCursor.PreviousBlock)
  
              self.code_editor.setTextCursor(cursor)
  
          cursor = self.code_editor.textCursor()
          self.line_number_cursor = cursor.blockNumber() + 1
  
          self.write_docstring_at_first_line_of_function()
docs: Write docstring to editor by shortcut of code editor.