class关键字定义

具有多态，继承等特点。

1.类的定义

代码如下：

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!/usr/bin/env python

coding:utf8

class Hotel(object):

"""docstring for Hotel"""
def __init__(self, room, cf=1.0, br=15):
    self.room = room
    self.cf = cf
    self.br = br

def cacl_all(self, days=1):
    return (self.room * self.cf + self.br) * days

if name == '__main__':

stdroom = Hotel(200)
big_room = Hotel(230, 0.9)
print stdroom.cacl_all()
print stdroom.cacl_all(2)
print big_room.cacl_all()
print big_room.cacl_all(3)

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2.父类、子类以及调用父类

代码如下：

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!/usr/bin/env python

-- coding: utf-8 --

父类

class AddBook(object):

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

def get_phone(self):
    return self.phone

子类，继承

class EmplEmail(AddBook):

def __init__(self, nm, ph, email):
    # AddBook.__init__(self, nm, ph) # 调用父类方法一
    super(EmplEmail, self).__init__(nm, ph) # 调用父类方法二
    self.email = email

def get_email(self):
    return self.email

调用

if name == "__main__":

Detian = AddBook('handetian', '18210413001')
Meng = AddBook('shaomeng', '18210413002')

print Detian.get_phone()
print AddBook.get_phone(Meng)

alice = EmplEmail('alice', '18210418888', 'alice@xkops.com')
print alice.get_email(), alice.get_phone()

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3.类的组合使用

代码如下：

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!/usr/bin/env python

-- coding: utf-8 --

'''
1.class类的组合使用
2.手机、邮箱、QQ等是可以变化的（定义在一起），姓名不可变（单独定义）。
3.在另一个类中引用
'''

class Info(object):

def __init__(self, phone, email, qq):
    self.phone = phone
    self.email = email
    self.qq = qq

def get_phone(self):
    return self.phone

def update_phone(self, newphone):
    self.phone = newphone
    print "手机号更改已更改"

def get_email(self):
    return self.email

class AddrBook(object):

'''docstring for AddBook'''
def __init__(self, name, phone, email, qq):
    self.name = name
    self.info = Info(phone, email, qq)

if name == "__main__":

Detian = AddrBook('handetian', '18210413001', 'detian@xkops.com', '123456')
print Detian.info.get_phone()
Detian.info.update_phone(18210413002)
print Detian.info.get_phone()
print Detian.info.get_email()

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4.内置功能(函数（）加与不加的区别）

代码如下：

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!/usr/bin/env python

coding:utf8

class Books(object):

def __init__(self, title, author):
    self.title = title
    self.author = author

def __str__(self):
    return self.title

def __repr__(self):
    return self.title

def __call__(self):
    print "%s is written by %s" %(self.title, self.author)

if name == '__main__':

pybook = Books('Core Python', 'Wesley')
print pybook
pybook()

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!/usr/bin/env python

coding:utf8

class Number(object):

"""Custum object
add/radd -> +; 
sub/rsub -> -;
mul/rmul -> *;
div/rdiv -> /;
"""
def __init__(self, number):
    self.number = number

def __add__(self, other):
    return self.number + other        

def __radd__(self, other):
    return self.number  + other

def __sub__(self, other):
    return self.number - other

def __rsub__(self, other):
    return other - self.number

def __gt__(self, other):
    if self.number > other:
        return True
    return False

if name == '__main__':

num = Number(10)
print num + 20
print 30 + num
print num - 5
print 11 - num
print num > 20