my_tree.py
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import turtle
def tree(n):
if n >=50:
pen.forward(n)
pen.right(30)
tree(n-10)
pen.left(60)
tree(n-10)
pen.right(30)
pen.up()
pen.backward(n)
pen.down()
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)
#tree(50)
#pen.left(60)
tree(100)
#pen.right(30)
#pen.backward(100)
turtle.done()