# indie:lang_version = 5
from indie import indicator, param, source, plot, color
from indie.algorithms import Change


@indicator('Mom')  # Momentum
@param.int('length', default=10, min=1)
@param.source('src', default=source.CLOSE, title='Source')
@plot.line(color=color.BLUE)
def Main(self, length, src):
    return Change.new(src, length)[0]