2018/05/ 28

[来源：菜鸟教程]（http://www.runoob.com/python3/python3-examples.html）

继续敲类相关的代码

#No.1

class people:

    name = ''

    age = 0

    __weight = 0

    def __init__(self, n, a, w):

        self.name = n

        self.age = a

        self.__weight = w

    def speak(self):

        print("%s 说：我 %d 岁。" %(self.name, self.age))

class student(people):

    grade = ''

    def __init__(self, n, a, w, g):

        people.__init__(self, n, a, w)

        self.grade = g

    def speak(self):

        print("%s 说：我 %d 岁了，我在读 %d 年纪" %(self.name, self.age, self.grade))

s = student('ken', 10, 60, 3)

s.speak()

resut:

d:\fly\Python (master -> origin)

λ python test.py

ken 说：我 10 岁了，我在读 3 年纪

#No.2

class people:

    name = ''

    age = 0

    __weight = 0

    def __init__(self, n, a, w):

        self.name = n

        self.age = a

        self.__weight = w

    def speak(self):

        print("%s 说：我 %d 岁。" %(self.name, self.age))

class student(people):

    grade = ''

    def __init__(self, n, a, w, g):

        people.__init__(self, n, a, w)

        self.grade = g

    def speak(self):

        print("%s 说： 我 %d 岁了，我在读 %d 年级"%(self.name, self.age, self.grade))

class speaker():

    topic = ''

    name = ''

    def __init__(self, n, t):

        self.name = n

        self.topic = t

    def speak(self):

        print("我叫 %s, 我是一个演说家， 我演讲的主题是 %s" %(self.name, self.topic))

class sample(speaker, student):

    a = ''

    def __init__(self, n, a, w, g, t):

        student.__init__(self, n, a, w, g)

        speaker.__init__(self, n, t)

test = sample("Tim", 25, 80, 4, "Python")

test.speak()

resut:

d:\fly\Python (master -> origin)

λ python test.py

我叫 Tim, 我是一个演说家， 我演讲的主题是 Python

#No.3

class parent:

    def myMethod(self):

        print('调用父类方法')

class child(parent):

    def myMethod(self):

        print('调用子类方法')

c = child()

c.myMethod()

super(child, c).myMethod()

resut:

d:\fly\Python (master -> origin)

λ python test.py

调用子类方法

调用父类方法

#No.4

class JustCounter:

    __secretCount = 0

    publicCount = 0

    def count(self):

        self.__secretCount += 1

        self.publicCount += 1

        print(self.__secretCount)

counter = JustCounter()

counter.count()

counter.count()

print(counter.publicCount)

print(counter.__secretCount)

resut:

d:\fly\Python (master -> origin)

λ python test.py

1

2

2

Traceback (most recent call last):

  File "test.py", line 14, in <module>

    print(counter.__secretCount)

AttributeError: 'JustCounter' object has no attribute '__secretCount'

#No.5

class Site:

    def __init__(self, name, url):

        self.name = name

        self.__url = url

    def who(self):

        print('name : ', self.name)

        print('url : ', self.__url)

    def __foo(self):

        print("这是私有方法")

    def foo(self):

        print('这是公共方法')

        self.__foo()

x = Site('菜鸟教程', 'www.runoob.com')

x.who()

x.foo()

x.__foo()

resut:

d:\fly\Python (master -> origin)

λ python test.py

name :  菜鸟教程

url :  www.runoob.com

这是公共方法

这是私有方法

Traceback (most recent call last):

  File "test.py", line 20, in <module>

    x.__foo()

AttributeError: 'Site' object has no attribute '__foo'