save project

my_tree.py

@@ -12,4 +12,24 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
+# pen.fd(100)
+# pen.right(30)
+# pen.fd(50)
+# pen.backward(50)
+# pen.left(60)
+# pen.fd(50)
+
+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()
+        
+tree(100)
 turtle.done()