>>> def addOne(myFunc):
... def addOneInside():
... return myFunc()+1
... return addOneInside
...
>>> def oldFunc():
... return 3
...
>>> oldFunc = addOne(oldFunc)
>>> oldFunc()
4
>>> oldFunc.__closure__[0].cell_contents()
3
>>>
#這樣的話,oldFunc.__closure__[0].cell_contents就是被包裝前的那個返回3的函數
#__closure__是tuple類型的
#閉包的實現