diff --git a/03/listtuple.py b/03/listtuple.py
index 8cd34d32..77a5dcc2 100644
--- a/03/listtuple.py
+++ b/03/listtuple.py
@@ -1,6 +1,9 @@
 # -*- coding:utf-8 -*-
 # 基础篇 03 列表和元组
 
+#列表 l = []
+#元组 t = ()
+#导入nympy,别名为np
 import numpy as np
 
 if __name__ == "__main__":
@@ -39,10 +42,14 @@
     
     # 内置函数
     l = [3,2,3,7,8,1]
+    #列表中值3的个数
     print(l.count(3))
+    #值为7的索引
     print(l.index(7))
+    #反转
     l.reverse()
     print(l)
+    #排序
     l.sort()
     print(l)
     
diff --git a/09/fun.py b/09/fun.py
index 5ccfad6f..bbf5000f 100644
--- a/09/fun.py
+++ b/09/fun.py
@@ -113,4 +113,22 @@ def exponent_of(base):
 	
 	print(square(2))
 	print(cube(2))
-	
\ No newline at end of file
+	
+# 闭包示例
+def make_averager():
+    series = []
+
+    def averager(new_value):
+        series.append(new_value)
+        total = sum(series)
+        return total/len(series)
+
+    return averager
+
+>>> avg = make_averager()
+>>> avg(10)
+10.0
+>>> avg(11)
+10.5
+>>> avg(12)
+11.0