codeblock 4379

# indie:lang_version = 5from indie import indicator, param, source, plot, colorfrom indie.algorithms import Bb@indicator('BB', overlay_main_pane=True)  # Bollinger Bands@param.int('length', default=20, min=1)@param.source('src', default=source.CLOSE, title='Source')@param.float('mult', default=2.0, min=0.001, max=50.0, title='StdDev')@param.int('offset', default=0, min=-500, max=500)@plot.line('lower', color=color.BLUE, title='Lower')@plot.line(color=color.RED, title='Basis')@plot.line('upper', color=color.BLUE, title='Upper')@plot.fill('lower', 'upper', color=color.AQUA(0.05), title='Background')def Main(self, length, src, mult, offset):    (lower, middle, upper) = Bb.new(src, length, mult)        return (        plot.Line(lower[0], offset=offset),        plot.Line(middle[0], offset=offset),        plot.Line(upper[0], offset=offset),        plot.Fill(),    )