import turtle

pen = turtle.Turtle()
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.backward(150)    # 后退
pen.down()
pen.forward(100)
pen.right(30)
pen.forward(50)
pen.up()
pen.right(180)
pen.forward(50)
pen.right(60)
pen.down()
pen.forward(50)
pen.right(180)
pen.forward(50)
tree(60)
turtle.done()