>>> john = AddrBookEntry('John Doe', '408-555-1212')Created instance for: John Doe>>> jane = AddrBookEntry('Jane Doe', '650-555-1212')Created instance for: Jane Doe

 

Class MyData(object):    pass>>> class MyData(object):...   pass...>>> mathObj = MyData()>>> mathObj.x = 4>>> mathObj.y = 5>>> mathObj.x + mathObj.y9

　　

"x" and "y" belong to the mathObj, the mathObj act as a container.

Not of class MyData

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self is like the C++ this key word.

this is the python philosophy, everything declared explicitly

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__init__() is like the constructor

Python creates the instance for you and then calls __init__() during instantiation

to define additional behavior that should occur when a class is instanciated.

classAddrBookEntry(object): # class definition    'address book entry class'    def __init__(self, nm, ph): # define constructor        self.name = nm # set name        self.phone = ph # set phone#        print'Created instance for:', self.name    def updatePhone(self, newph): # define method        self.phone = newph        print'Updated phone# for:', self.nam

　　

The only initialize the parameter is the name and phone that is --nm --ph