## 绘制分型树,末梢的树枝的颜色不同

import turtle


def draw_brach(brach_length):


  if brach_length > 5:
    if brach_length < 40:
      turtle.color('green')

    else:
      turtle.color('red')

    # 绘制右侧的树枝
    turtle.forward(brach_length)
    print('向前',brach_length)
    turtle.right(25)
    print('右转20')
    draw_brach(brach_length-15)
    # 绘制左侧的树枝
    turtle.left(50)
    print('左转40')
    draw_brach(brach_length-15)

    if brach_length < 40:
      turtle.color('green')

    else:
      turtle.color('red')


    # 返回之前的树枝上
    turtle.right(25)
    print('右转20')
    turtle.backward(brach_length)
    print('返回',brach_length)

def main():
  turtle.left(90)
  turtle.penup()
  turtle.backward(150)
  turtle.pendown()
  turtle.color('red')

  draw_brach(100)

  turtle.exitonclick()

if __name__ == '__main__':
  main()