import turtle
turtle.color('green')
turtle.bgcolor('black')
turtle.width(3)
def branch(length,level):
  if level<=0:
    return
 
  turtle.forward(length)
  turtle.left(45)
  branch(0.6*length,level-1)
  turtle.right(90)
  branch(0.6*length,level-1)
  turtle.left(45)
  turtle.backward(length)
  return
 
turtle.left(90)
branch(100,6)

turtle.exitonclick()
