def __init__(self, marker='#', left='|', right='|', fill=' ', fill_left=True):
        '''Creates a customizable progress bar.

        marker - string or updatable object to use as a marker
        left - string or updatable object to use as a left border
        right - string or updatable object to use as a right border
        fill - character to use for the empty part of the progress bar
        fill_left - whether to fill from the left or the right
        '''
        self.marker = marker
        self.left = left
        self.right = right
        self.fill = fill
        self.fill_left = fill_left
Creates a customizable progress bar.

        marker - string or updatable object to use as a marker
        left - string or updatable object to use as a left border
        right - string or updatable object to use as a right border
        fill - character to use for the empty part of the progress bar
        fill_left - whether to fill from the left or the right
        
metadrive/render_pipeline/rplibs/progressbar/widgets.py