python 基础之第十一天（面向对象）

#############面向对象#####################

类：

In [1]: class MyClass(object):         ##用class定义一个类
   ...:     def pstar(self):
   ...:         print '*'*20
   ...:         

In [2]: a = MyClass()         ##创建一个实例对象，跟java相似

In [3]: a.pstar()            ##通过实例对象，调用类里面的方法，这里的相当于把实例对象’a‘传递给self，作为pstar的参数了，所以不报错，self 是可以是任何东西，习惯写self
********************

In [4]: MyClass.pstar(a)    #####
  ********************

#####################类的组合###########################

#!/usr/bin/env python
#-*- coding:utf-8 -*-

class Info(object):
    def __init__(self,ph,em,qq):
        self.phone = ph
        self.email = em
        self.qq = qq
    def get_phone(self):
        return self.phone
    def update_phone(self,newph):
        self.phone = newph
class AddrBook():
    def __init__(self,nm,ph,em,qq):
        self.name = nm
        self.info = Info(ph,em,qq)
if __name__ == '__main__':
    bob = AddrBook("Bob Green",'','bob@qq.com','')
    print bob.info.get_phone()

效果：

C:\Python27\python2.exe D:/pycharm/pa/addbook2.py
15980113980
Bob Green

####################类的继承###################

#!/usr/bin/env python
#-*- coding:utf-8 -*-

class AddBook(object):
    def __init__(self,nm,ph):
        self.name = nm
        self.phone = ph
    def get_name(self):
        return self.name
    def get_phone(self):
        return self.phone
class Add(AddBook):
    pass
if __name__ == '__main__':
    bob = Add('Bob Green','')
    print bob.get_phone()
    print bob.get_name()

效果：

C:\Python27\python2.exe D:/pycharm/pa/addbook.py
15980113990
Bob Green

#!/usr/bin/env python
#-*- coding:utf-8 -*-

class AddBook(object):
    def __init__(self,nm,ph):
        self.name = nm
        self.phone = ph
    def get_name(self):
        return self.name
    def get_phone(self):
        return self.phone
class Add(AddBook):
    def __init__(self,nm,ph,id):
        self.id = id
        AddBook.__init__(self,nm,ph)     #####继承

if __name__ == '__main__':
    bob = Add('Bob Green','','')
    print bob.get_phone()
    print bob.get_name()
    print bob.id

效果：

C:\Python27\python2.exe D:/pycharm/pa/addbook.py
15980113990
Bob Green
350823199900616671

额外：

##########__str__##############

#!/usr/bin/env python
#-*- coding:utf-8 -*-

class Book():
    def __init__(self,tt,bb):
        self.tt = tt
        self.bb = bb
    def __str__(self):
        return self.tt

if __name__ == '__main__':
    playbook = Book('fush','hua')
    print playbook                  ###因为类中定义了__str__方法，直接通过实例对象返回值

结果：

C:\Python27\python2.exe D:/pycharm/pa/book.py
fush

############__call__################

#!/usr/bin/env python
#-*- coding:utf-8 -*-

class Book():
    def __init__(self,tt,bb):
        self.tt = tt
        self.bb = bb
    def __str__(self):
        return self.tt
    def __call__(self):
        print '%s %s' % (self.tt,self.bb)

if __name__ == '__main__':
    playbook = Book('fush','hua')
    print playbook  #因为类中定义了__str__方法，此处打印出的是__str__的返回值
    playbook()  #调用playbook就是执行__call__方法中的代码

今日最后：

In [8]: import ftplib

In [9]: ftplib.__file__
Out[9]: '/usr/lib64/python2.6/ftplib.pyc'
[root@master ~]# vim /usr/lib64/python2.6/ftplib.py