Python, Turtle, Dragon

Python turtle unit draws dragon curve. Code from the video: import turtle def dragoncurve(l,n): def x(n): if n==0: return x(n-1) turtle.rt(90) y(n-1) turtle.fd(l) def y(n): if n==0: return turtle.fd(l) x(n-1) turtle.lt(90) y(n-1) turtle.fd(l) x(n) dragoncurve(3,12)