def _get_adjusted_bar(x, bar_width, series_index, num_plots):
 adjust = (((((-0.5) * num_plots) - 1) + series_index) * bar_width)
 return [(x_val + adjust) for x_val in x]

def _get_adjusted_bar ( x , bar_width , series_index , num_plots ) : adjust = ( ( ( ( ( - 0.5 ) * num_plots ) - 1 ) + series_index ) * bar_width ) return [ ( x_val + adjust ) for x_val in x ]
adjust the list x to take the multiple series into account .