• python之类的继承及方法讲解分析


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


    # class Person(object):
    # def __init__(self,name,age):
    # self.name = name
    # self.age = age
    #
    # def getName(self):
    # return self.name
    #
    # def getAge(self):
    # return self.age
    #
    # def setName(self, name):
    # self.name=name
    #
    # def setAge(self,age):
    # self.age=age
    #
    # def info(self):
    # return "name{0},age{1}".format(self.name,self.age)
    # per = Person("Teacher",24)
    # per.info()
    # print(per.info())

    """
    首先一个类,不管是否写了构造函数,它都是有构造函数的
    一个类,可以有多个构造函数,建议一个类只有一个构造函数
    构造函数
    1.初始化属性
    """
    # class Person1(object):
    # #动态方法
    # def __init__(self,*args,**kwargs):
    # self.args = args
    # self.kwargs = kwargs
    #
    # def info(self):
    # # print("信息:",self.kwargs)
    # print("信息:",self.args)
    #
    # per1 = Person1(name="Teacher",age=24)
    # per1 = Person1("Teacher",26)
    # per1.info()
    # per1.info()


    """
    析构函数
    对象实例化-->构造函数-->对象调用方法-->代码跳转到具体的方法
    -->执行方法的代码块-->最后执行析构函数
    """
    # class Person(object):
    # def __init__(self):
    # print("我是构造方法")
    #
    # def __del__(self):
    # print("我是析构方法")
    #
    # def info(self):
    # print("我是方法")
    #
    # per = Person()
    # per.info()
    #

    """
    普通方法
    """
    # class Person2(object):
    # def conn(self,user,passwd,host,port):
    # pass
    #
    # def f1(self,*args,**kwargs):
    # # self.kwargs = kwargs
    # # self.args = args
    # pass
    #
    # def info(self):
    # print("我是普通方法")
    #
    # per = Person2()
    # per.conn("root",123456,"localhost",3306)
    # per.info()

    """
    特性方法:不能有形式参数
    """
    # class Person(object):
    #
    # @property #装饰器
    # def getUserID(self):
    # pass
    #
    # per = Person()
    # per.getUserID #不加(),加()报错

    # from selenium import webdriver
    # driver = webdriver.Firefox()
    # driver.find_element_by_id("kw").text

    """
    静态方法:
    可以直接使用类名来调用方法,属于类
    实例对象也可以调用方法,但不建议使用,多此一举!
    """
    # class MySQL(object):
    # @staticmethod
    # # 方法参数不用加self
    # def conn(user):
    # pass
    #
    # # MySQL.conn("Teacher")
    # sql = MySQL()
    # sql.conn("Teacher")

    """
    类的方法:直接使用类名来调用
    """
    # class MySQL(object):
    # @classmethod
    # # 方法参数不用加self
    # def conn(cls):
    # pass
    #
    # # MySQL.conn("Teacher")
    # MySQL.conn()

    """
    属于类:
    类属性
    静态方法
    类方法
    属于对象:
    实例属性
    普通方法
    特性方法
    """

    """
    类的继承:重复使用已经存在的数据和行为,减少重复编写代码,
    子类继承父类的实例属性和方法
    """
    """类属性的继承"""
    # class Person(object):
    # China = "中国"
    # class UsaPerson(Person):
    # pass
    # Usa = UsaPerson()
    # Usa.China
    # print(Usa.China)

    """实例属性的继承与继承的两种写法"""
    # class Fruit(object):
    # def __init__(self,name):
    # self.name = name

    """子类由于业务的需求,需要继承父类的实例属性"""

    # class Apple(Fruit):
    # def __init__(self,name,brand,color):
    # # super(Apple,self).__init__(name)
    # Fruit.__init__(self,name)
    # self.brand = brand
    # self.color = color
    #
    # def info(self):
    # return "名称{0},品牌{1},颜色{2}".format(self.name,self.brand,self.color)
    #
    # app = Apple("苹果","富士","红色")
    # app.info()
    # print(app.info())

    # class Fruit(object):
    # def __init__(self,name):
    # self.name = name
    """子类由于业务的需求,不需要继承父类的实例属性"""

    # class Apple(Fruit):
    # def __init__(self,brand,color):
    # self.brand = brand
    # self.color = color
    #
    # def info(self):
    # return "品牌{0},颜色{1}".format(self.brand,self.color)
    #
    # app = Apple("富士#","红色")
    # app.info()
    # print(app.info())

    """格式化字符"""
    #"{a} Love {b}.{0}".format(a = "I",b = "You","com")
    "{0} Love {a}.{b}".format("I",a = "You",b = "com")


    """
    方法的继承:
    子类为什么要重写父类的方法?子类有自己的特性
    当子类重写了父类的方法,对子类进行实例化对象后,
    子类调用的(父类,子类方法都存在)方法,执行的方法是子类的方法

    """
    # class Person(object):
    # def eat(self):
    # print("人需要吃饭的")
    #
    # class Son(Person):
    # def __init__(self,name):
    # self.name = name
    #
    # def eat(self):
    # print("名字是{0},为什么?".format(self.name))
    #
    # son = Son("Teacher")
    # son.eat()


    """
    单个类继承的原则:
    1.从上到下,子类继承父类,但没有重写父类的方法,
    对子类进行实例化对象后,执行调用是直接父类中的方法
    2.从下到上,子类继承父类,但子类重写父类的方法,
    对子类进行实例化对象后,执行调用是直接子类中的方法(优先调用自己方法)
    """

    # class Fruit(object):
    # def eat(self):
    # print("水果是用来吃的")
    #
    # class Apple(Fruit):
    # def __init__(self,color):
    # self.color = color
    #
    # def eat(self):
    # print("苹果的颜色{0},该吃掉了!".format(self.color))
    #
    # class Band(Apple):
    # def eat(self):
    # print("我是Apple的子类")
    #
    # band = Band("红色")
    # band.eat()

    # class Person(object):
    # def __init__(self,name):
    # self.name=name
    #
    # def info(self):
    # print (self.name)
    #
    # class Son(Person):
    # def info(self):
    # print (self.name)
    #
    # s=Son('name')
    # s.info()
    #

    """多个继承:执行的顺序,从左到右执行;并且是同一级别的!同一级别指的是共同的类"""

    # class Person(object):
    # def eat(self):
    # print("人是吃饭的")
    #
    # class Monther(Person):
    # # def eat(self):
    # # print("妈妈不吃饭,要减肥")
    # pass
    #
    # class Father(Person):
    # def eat(self):
    # print("爸爸吃饭!")
    #
    # class Son(Monther,Father):
    # pass
    #
    # son = Son()
    # son.eat()


    """__doc__ 打印出类的注释"""

    # class Person(object):
    # """人的属性&特性"""
    # def info(self,username,password):
    # """
    # :param username: 参数用户名
    # :param password: 参数密码
    # :return:
    # """
    # pass
    #
    # per = Person()
    # print(per.__doc__)

    """__call__:对象创建时直接返回__call__的内容,使用该方法可以模拟静态方法"""

    # class Per(object):
    # def __new__(cls, *args, **kwargs):
    # print("打印出call方法")
    #
    # per = Per()

    """
    __str__:对象代表的含义,返回一个字符串,通过他可以把字符串和对象关联起来,方便某些程序的实现
    该字符串表示某个类,实现__str__后,可以直接使用print语句打印出对象,也可以通过str来触发__str__来执行
    __str__:
    1.对象的意思
    2.返回一个字符串,对象和字符串关联起来 -->该字符串可表示一个类
    """
    # class Per(object):
    # """我是一个字符串类"""
    # def __str__(self):
    # return self.__doc__
    #
    # per = Per()
    # print(str(per))

    class Factory(object):
    def createFruit(self,fruit):
    if fruit == "apple":
    return Apple()
    elif fruit == "banana":
    return Banana()

    class Fruit(object):
    def __str__(self):
    return "fruit"

    class Apple(object):
    def __str__(self):
    return "apple"

    class Banana(object):
    def __str__(self):
    return "banana"

    if __name__ == '__main__':
    factory = Factory()
    print(factory.createFruit("apple"))
    print(factory.createFruit("banana"))


    """工厂设计模式在UI中的应用"""
    from selenium import webdriver
    from appium import webdriver
    from selenuim.webdriver.support.expected_conditions import NoSuchElementException
    from selenium.webdriver.common.by import By

    class Factory(object):
    def createWebDriver(self,WebDriver):
    if WebDriver == "web":
    return WebUI(self.driver)
    elif WebDriver == "app":
    return AppUI(self.driver)

    class WebDriver(object):
    def __init__(self,webdriver):
    self.webdriver = webdriver

    def __str__(self):
    return "WebDriver"

    def findElement(self,*loc):
    try:
    return self.driver_find_element_By(*loc)
    except NoSuchElementException as e:
    print("Error details:%s",e.args[0])


    def findElements(self,*loc):
    try:
    return self.driver_find_element_By(*loc)
    except NoSuchElementException as e:
    print("Error details:%s",e.args[0])

    class WebUI(WebDriver):
    def __str__(self):
    return "web"

    class AppUI(WebDriver):
    def __str__(self):
    return "app"

    if __name__ == '__main__':
    factory = Factory()
    print(factory.createFruit("web"))
    print(factory.createFruit("app"))
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  • 原文地址:https://www.cnblogs.com/Teachertao/p/10426386.html
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