【python学习笔记】7.更加抽象

向右看齐 2023-08-17 16:13 102阅读 0赞

# 【python学习笔记】7.更加抽象 #

*  类的定义就是执行代码块
 *  在内存保存一个原始实例，可以通过类名来访问
 *  类的实例化，是创建一个原始实例的副本, 并且所有成员变量与原始实例绑定
 *  通过修改实例变量，可以解除与原始实例的绑定
 *  self表示当前实例的引用
 *  成员变量也称为特性
 *  \_\_bases\_\_: 基类
 *  \_\_class\_\_: 对象类型
 *  \_\_dict\_\_: 所有特性
 *  python的接口不用显式的制定对象必须包含哪些方法，只要对象符合当前接口就可以调用
 *  可以对象上通过赋值的方式，创建变量
 *

#!/usr/bin/env python
    # -*- coding: utf-8 -*-   # 指定源码文件编码,python默认为ASCII
    
    __metaclass__ = type  # 确定使用新式类
    
    class Person:
        def setName(self, name): # self 为是当前实例的引用
            self.name = name
        def getName(self):
            return self.name
        def greet(self):
            print "hello, world! I'm %s." % self.name
        def __inaccessible(self): # 私有函数，外界不可以访问
            print "Bet you can't see me..."
        def _inaccessible(self):  # 不会被import导出
            print "Bet you can't see me..."
    
    foo = Person() # 创建对象
    bar = Person()
    
    foo.setName("foo")
    bar.setName("bar")
    
    print foo.getName()
    print bar.getName()
    
    foo.greet()
    bar.greet()
    
    #foo.__inaccessible()
    foo._inaccessible()
    
    
    print "------------------------"
    
    '''
    '''
    
    
    class MemberCounter:
        print "class MemberCounter begin defined"
        members = 0
        members2 = 0
        def init(self):
            MemberCounter.members += 1
            MemberCounter.members2 += 1
    
    
    m1 = MemberCounter()
    m1.init()
    m2 = MemberCounter()
    m2.init()
    
    print "----"
    print "m1.members", m1.members
    print "m2.members", m2.members
    print "MemberCounter.members", MemberCounter.members
    print "----"
    
    
    print "modify m1.members"
    m1.members='m1'
    
    print "----"
    print "m1.members", m1.members
    print "m2.members", m2.members
    print "MemberCounter.members", MemberCounter.members
    print "----"
    
    
    print "modify MemberCounter.members"
    MemberCounter.members = "MemberCounter"
    
    print "----"
    print "m1.members", m1.members
    print "m2.members", m2.members
    print "MemberCounter.members", MemberCounter.members
    print "----"
    
    print "create m3"
    m3=MemberCounter()
    print "----"
    print "m1.members", m1.members, "m1.members2", m1.members2
    print "m2.members", m2.members, "m2.members2", m2.members2
    print "m3.members", m3.members, "m3.members2", m3.members2
    print "MemberCounter.members", MemberCounter.members, "MemberCounter.members2", MemberCounter.members2
    print "----"
    
    
    print "modify MemberCounter.members2"
    MemberCounter.members2= "members2"
    
    print "----"
    print "m1.members", m1.members, "m1.members2", m1.members2
    print "m2.members", m2.members, "m2.members2", m2.members2
    print "m3.members", m3.members, "m3.members2", m3.members2
    print "MemberCounter.members", MemberCounter.members, "MemberCounter.members2", MemberCounter.members2
    print "----"
    
    
    m3.members2="m3.members2"
    MemberCounter.members2= "members2 last"
    
    print "----"
    print "m1.members", m1.members, "m1.members2", m1.members2
    print "m2.members", m2.members, "m2.members2", m2.members2
    print "m3.members", m3.members, "m3.members2", m3.members2
    print "MemberCounter.members", MemberCounter.members, "MemberCounter.members2", MemberCounter.members2
    print "----"
    
    
    
    '''
    '''
    
    print "---------------------"
    
    class Filter:
        def init(self):
            self.blocked = [] # 创建成员变量
        def filter(self, sequence):
            return [x for x in sequence if x not in self.blocked]
    
    class SPAMFilter(Filter): # 继承，可以是逗号分隔的多个基类
        def init(self): # 重载
            self.blocked = ['SPAM']
    
    
    f = Filter()
    f.init()
    print f.filter([1,2,3])
    
    s = SPAMFilter()
    s.init()
    print s.filter(["SPAM", "SPAM","SPAM","SPAM",  "eggs", "bacom" ])
    
    
    
    
    print "---------------------"
    class C:
        def dis(self):
            self.c=1
            print self.c
    
    c=C()
    c.dis()
    c.cc=3
    print "c.cc", c.cc
    
    print "c.__dict__", c.__dict__
    print "C.__dict__", C.__dict__
    
    
    print "Filter.__dict__", Filter.__dict__
    print "f.__dict__", f.__dict__
    print "s.__dict__", s.__dict__
    
    print "m1.__dict__", m1.__dict__
    print "m2.__dict__", m2.__dict__
    print "m3.__dict__", m3.__dict__
    print "MemberCounter.__dict__", MemberCounter.__dict__

转载于:https://www.cnblogs.com/vc60er/p/7351641.html