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（1）常规创建一个类方法如下：

class Person(object):    def __init__(self, name, gender):        self.name = name        self.gender = genderp = Person('Alien', 'Male')print(p.name)print(p.gender)

• Alien
• Male

（2）但有时候，我们希望创建的是基类，希望其他类来继承的。如果这个基类有4个属性，但只有2个属性是固定不变的，为了方便其他类去继承，如何编写某个类呢？

class Person(object):    country = 'china'                            #写在__init__外面，实例化类时可以不用定义属性，这个是默认值    work = ''                                    # 默认值为 空    def __init__(self, name, gender):        self.name = name        self.gender = genderp = Person('Alien', 'Male')print(p.name)print(p.gender)print('='*25)print(p.country)print(p.work)print('='*25)

• Alien
• Male
• =========================
• china
• =========================

（3）新建的类如果继承基类，那么新类里面也会包含所有基类的属性

class Person(object):    country = 'china'    work = ''    def __init__(self, name, gender):        self.name = name        self.gender = genderclass Tester(Person):                    #新类，继承了基类里面所有的属性    def print_info(self):        print('hello')t = Tester('Alien', 'Male')print(t.name)print(t.gender)print('='*20)print(t.country)print(t.work)print('='*20)

• Alien
• Male
• =========================
• china
• =========================

（4）在新建的类里面，重新定义继承来自基类里面的属性

class Person(object):    country = 'china'    work = ''    def __init__(self, name, gender):        self.name = name        self.gender = genderclass Tester(Person):    country = 'chinese'            # 重新定义了属性    work = 'tester'                # 重新定义了属性    def print_info(self):        print('hello')t = Tester('Alien', 'Male')print(t.name)print(t.gender)print('='*20)print(t.country)print(t.work)print('='*20)

• Alien
• Male
• =========================
• chinese
• tester
• =========================

（5）如果继承了基类的属性是4个，但是新类需要的属性是5个，怎么办？

class Person(object):    country = 'china'    work = ''    def __init__(self, name, gender):        self.name = name        self.gender = genderclass Tester(Person):    country = 'chinese'    work = 'tester'    def __init__(self, name, gender, course):                # 添加所有属性，在基类属性基础上，增加course        super(Tester, self).__init__(name, gender)           # 调用父类的__init__方法，定义基类属性        self.course = course                                 # 单独定义添加的属性t = Tester('Alien', 'Male', 'Business & English')            print(t.name)print(t.gender)print('='*20)print(t.country)print(t.work)print(t.course)print('='*20)

• Alien
• Male
• ====================
• chinese
• tester
• Business & English
• ====================

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