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  # indie:lang_version = 5from indie import IndieError, indicator, param, plot, color, MainContextfrom indie.schedule import ScheduleRule, Schedulefrom datetime import time@indicator('Trading Sessions', overlay_main_pane=True)@plot.background(title='- background, - outline')@plot.background(title='+ background, - outline', color=color.RED)@plot.background(title='- background, + outline', outline_color=color.RED)@plot.background(title='+ background, + outline', color=color.RED, outline_color=color.RED)def Main(self):    cond_1 = self.bar_index % 12 in [0, 1]    cond_2 = self.bar_index % 12 in [3, 4]    cond_3 = self.bar_index % 12 in [6, 7]    cond_4 = self.bar_index % 12 in [9, 10]        return (        plot.Background(color=color.WHITE(0.3 if cond_1 else 0), outline_left=cond_1),        plot.Background(color=color.YELLOW(0.3 if cond_2 else 0), outline_left=cond_2),        plot.Background(color=color.GREEN(0.3 if cond_3 else 0), outline_left=cond_3),        plot.Background(color=color.AQUA(0.3 if cond_4 else 0), outline_left=cond_4),    )