save project

my_tree.py

@@ -11,18 +11,15 @@ pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
-
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-pen.left(60)
-pen.forward(50)
-pen.up()
-pen.backward(50)
-pen.down()
-pen.hideturtle()
-
+def tree(i):
+    if i>=5:
+        pen.forward(i)
+        pen.right(30)
+        tree(i-10)
+        pen.backward(50)
+        pen.left(60)
+        tree(i-10)
+        pen.right(30)
+        pen.backward(i)
+tree(110)
 turtle.done()