Show the y-axis tick labels for all specified subplots.

        :param row_column_list: a list containing (row, column) tuples to
            specify the subplots, or None to indicate *all* subplots.
        :type row_column_list: list or None

def show_yticklabels_for_all(self, row_column_list=None):
        """Show the y-axis tick labels for all specified subplots.

        :param row_column_list: a list containing (row, column) tuples to
            specify the subplots, or None to indicate *all* subplots.
        :type row_column_list: list or None

        """
        if row_column_list is None:
            for subplot in self.subplots:
                subplot.show_yticklabels()
        else:
            for row, column in row_column_list:
                self.show_yticklabels(row, column)