(四)4-2 Python的类 --续

类的重写
变量和方法重写

class parent():
    name = 'parent'
    age = 100
    sex = 'male'
    def __init__(self):
        print('my name is {0}'.format(self.name))
    def get_name(self):
        return self.name
    def get_sex(self):
        return self.sex
class child(parent):
    name = 'child'
    age = 10
    def __init__(self):
        print('my name is {0}'.format(self.name))
    def hello(self):
        print('hello world')
    def get_name(self):
        print('hello cnblogs')

a = child()
a.hello()
print(a.get_name())
print(a.get_sex())

运行结果：

my name is child
hello world
hello cnblogs
None
male
male

class parent(object):
    parent_name = 'parent'
    sex = 'F'
    def __init__(self,address,age):
        self.address = address
        self.age = age
        print('my name is {0}'.format(self.parent_name))
    def get_name(self):
        return self.name
    def get_sex(self):
        return self.sex
class child(parent):
    child_name = 'child'
    def __init__(self,address,age):
        # parent.__init__(self,address,age)
        super(child,self).__init__(address,age)
        print('my name is {0}'.format(self.child_name))
    def hello(self):
        print('hello world')
    def get_name(self):
        print('hello cnblogs')

a = child('shenzhen',100)
a.hello()
print(a.get_name())
print(a.get_sex())
print(a.address)
print(a.age)

运行结果：

my name is parent
my name is child
hello world
hello cnblogs
None
F
shenzhen
100

class parent(object):
    parent_name = 'parent'
    sex = 'F'
    def __init__(self,address,age):
        self.address = address
        self.age = age
        print('my name is {0}'.format(self.parent_name))
    def get_name(self):
        print('parent ############')
        return self.parent_name
    def get_sex(self):
        return self.sex
class child(parent):
    child_name = 'child'
    def __init__(self,address,age):
        # parent.__init__(self,address,age)
        super(child,self).__init__(address,age)
        print('my name is {0}'.format(self.child_name))
    def hello(self):
        print('hello world')
    def get_name(self):
        super(child,self).get_name()
        print('hello cnblogs')


a = child('shenzhen',10)
a.hello()
a.get_name()
print(a.get_sex())
print(a.address)
print(a.age)

运行结果：

my name is parent
my name is child
hello world
parent ############
hello cnblogs
F
shenzhen
10

8.5 类的私有变量

在Python中可以通过在属性变量名前加上双下划线定义属性为私有属性

class A(object):
    _name = 'zhan'
    __sex = 'F'
    def hello(self):
        print(self._name)
        print(self.__sex)
    def get_sex(self):
        return self.__sex

a = A()
print(a._name)
# print(a.__sex)
a.hello()
print(a.get_sex())

运行结果：

zhan
zhan
F
F