Executing Arc Program in Python -

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i have wrote arc program use turtleworld execute. result right. in serious issue, can reduce code & can explain me code have wrote. didn't concept. program in exercise session of book

from swampy.turtleworld import * world = turtleworld() bob = turtle()  def arc(t=bob, r=50, angle=360):     arc_length = 2 * 3.14 * r * angle / 360     n = int(arc_length / 3) + 1     step_length = arc_length / n     step_angle = float(angle) / n     in range(n):         fd(t, step_length)         lt(t, step_angle)  arc() wait_for_user()


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