import turtle

#pen = turtle.Turtle()
pen = turtle.Pen()
pen.color('sienna')
# 画布大小
w = turtle.Screen()
w.bgcolor('wheat')      # wheat小麦

# 移动到起点
pen.left(90)
#pen.up()
pen.penup()
pen.backward(150)    # 后退
pen.pendown()
#pen.down()

pen.pensize(7)
pen.speed(1)

#画出二叉树
pen.forward(100)
pen.right(30)
pen.forward(50)
pen.goto(0,-50)
pen.penup()
pen.left(60)
pen.pendown()
pen.forward(50)
pen.penup()
pen.goto(0,-150)


turtle.done()