chap Class

>>> 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.y
9

　　

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

Not of class MyData

---

 

self is like the C++ this key word.

this is the python philosophy, everything declared explicitly

---

 

__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