在Python中使用WITH语句

Using with statement in python

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嘿，伙计们正试图在我的代码中使用with语句..因为我对python不熟悉，所以我刚写了代码来理解with语句的工作..我的代码

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class Employee:
empCount = 0
def __init__(self, name, salary):
self.name = name
self.salary = salary

c = Employee("blah",1)
c.empCount = ['aad']

class Subin(Employee):

def __init__(self, name, salary):
self.name = name
self.salary = salary

def __enter__(self):
return self

def __exit__(self ,type):
print 'ok'

def babe(self):
with c.empCount as b:
return 0

b = Subin("sds",1)
b.babe()

当我运行代码时，我得到错误：

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Traceback (most recent call last):
File"C:/Python27/dfg", line 38, in <module>
b.babe()
File"C:/Python27/dfg", line 33, in babe
with c.empCount as b:
AttributeError: __exit__

你们能告诉我为什么会这样吗？