Python小白丁日记(6)——递归函数（绘制分形树）

import turtle

def draw_branch(branch_length):

     if branch_length>5:
         turtle.forward(branch_length)
         print('向上',branch_length)
         turtle.right(20)
         print('右转20')
         draw_branch(branch_length-15)


         turtle.left(40)
         print('左转40')
         draw_branch(branch_length-15)

         turtle.right(20)
         print('右转20')
         turtle.backward(branch_length)
         print('向下',branch_length)


def main():
    turtle.left(90)
    turtle.penup()
    turtle.backward(200)
    turtle.pendown()
    turtle.pensize(5)
    turtle.pencolor("green")


    draw_branch(50)
    turtle.exitonclick()


if __name__ == '__main__':
    main()

python知识都是跟着小象学院梁斌老师的教学视频课敲的代码，梁老师讲得很好，有兴趣的同学可以去学习，如有违规，侵删