save project

my_tree.py

@@ -11,15 +11,24 @@ pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
-
+#画树
 pen.forward(100)
-pen.left(30)
+#画右树杈
+pen.right(30)
 pen.forward(50)
+pen.up()
 pen.backward(50)
-pen.right(60)
+pen.down()
+#画左树杈
+pen.left(60)
 pen.forward(50)
+pen.up()
 pen.backward(50)
-pen.left(30)
+pen.down()
+#树干返回
+pen.right(30)
+pen.up()
 pen.backward(100)
+pen.down()
 
 turtle.done()