@staticmethod
def show_stat(count_value, max_count_value, prepend, speed, tet, eta, width,
    **kwargs):
    """
            re implement this function in a subclass
            
            count_value - current value of progress
            
            max_count_value - maximum value the progress can take
            
            prepend - some extra string to be put for example in front of the
            progress display
            
            speed - estimated speed in counts per second (use for example humanize_speed
            to get readable information in string format)
            
            tet - total elapsed time in seconds (use for example humanize_time
            to get readable information in string format)
            
            eta - estimated time of arrival in seconds (use for example humanize_time
            to get readable information in string format)
        """
    raise NotImplementedError
