tanteng · tanteng · Apr 25, 2016 · Apr 25, 2016
diff --git a/closure.py b/closure.py
@@ -1,15 +1,28 @@
 def hellocounter (name):
-    count=[0]
+    count=0 #PYTHON 2.x 中，要写count=[0]
    def counter():
-        count[0]+=1
-        print('Hello,',name,',',count[0],' access!')
+        nonlocal count #PYTHON 2.x 中，此行和下一行要换成count[0]+=1
+        count+=1
+        print('Hello,',name,',',count,' access!')#PYTHON 2.x 中请自觉换成str(count[0])
    return counter

 hello = hellocounter('ma6174')
 hello()
 hello()
 hello()

+'''
+执行结果
+>>> hello()
+Hello, ma6174 , 1  access!
+>>> hello()
+Hello, ma6174 , 2  access!
+>>> hello()
+Hello, ma6174 , 3  access!
+'''
+##为什么PYTHON 2.x中不直接写count而用list？这是python2的一个bug,如果用count话,会报这样一个错误:
+##UnboundLocalError: local variable 'count' referenced before assignment.
+
 def make_adder(addend):
    def adder(augend):
        return augend + addend