auto save

my_tree.py

@@ -7,9 +7,20 @@ w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
 
-pen.left(60)
-pen.up()
-pen.backward(150)    # 后退
-pen.down()
+
+def tree(n):
+    if n>=50:
+        pen.fd(n)
+        pen.right(30)
+        tree(n-50)
+        pen.left(60)
+        tree(n-50)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+
+
 
 turtle.done()