save project

my_tree.py

@@ -12,4 +12,18 @@ pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
+def tree (n):
+    if n>=50:
+        pen. forward(n)
+        pen.right(30)
+        tree(n-50)
+        pen.left(60)
+        tree(n-50)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(200)
+
+
 turtle.done()
 turtle.done()