auto save

my_tree.py

@@ -12,4 +12,28 @@ pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
+#主干
+pen.fd(100)
+
+#右边分叉
+pen.right(30)
+pen.fd(50)
+pen.up() #返回分叉点
+pen.bk(50)
+pen.down()
+
+#左边分叉
+pen.left(60)
+pen.fd(50)
+pen.up() #返回分叉点
+pen.bk(50)
+pen.down()
+
+#返回树干
+
+pen.right(30)
+pen.up() #返回分叉点
+pen.bk(100)
+pen.down()
+
 turtle.done()
 turtle.done()