save project

my_tree.py

@@ -12,14 +12,16 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
-pen.forward(200)
-pen.right(30)
-pen.forward(100)
-pen.backward(100)
-pen.left(60)
-pen.forward(100)
-pen.backward(100)
-pen.right(30)
-pen.backward(200)
-
+def tree(n):#pen.right(30)
+    if n>=50:#pen.forward(100)
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
+        pen.up
+        pen.backward(n)
+        pen.down()
+tree(100)
 turtle.done()