save project

my_tree.py

 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
+w.bgcolor('wheat')
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(150)
 pen.down()
 pen.forward(100)
 pen.right(30)