python类的封装、继承、多态

#案例：小智今天想出去，但不清楚今天的天气是否适宜出行，需要一个帮他提供建议的程序，程序要求输入daytime
#和night，根据可见度和温度给出出行建议和使用的交通工具，需要考虑需求变更的可能
#需求分析：使用python类的封装、继承、多态比较容易实现，由父类封装查看可见度和查看温度的方法，
#子类继承父类。若有需要，子类可以覆盖父类的方法，做自己的实现。子类也可以自定义方法
#
#
class WeatherSearch(object):
    def __init__(self,input_daytime):
        self.input_daytime = input_daytime

    def seach_visibility(self):
        visible_leave = 0
        if self.input_daytime == 'daytime':
            visible_leave = 2
        if self.input_daytime == 'night':
            visible_leave = 9
        return visible_leave

    def seach_temperature(self):
        temperature = 0
        if self.input_daytime == 'daytime':
            temperature = 26
        if self.input_daytime == 'night':
            temperature = 16
        return temperature

class OutAdvice(WeatherSearch):
    def __init__(self,input_daytime):
        #继承父类的__init__方法
        WeatherSearch.__init__(self,input_daytime)

        #子类覆盖父类的方法 多态
    def seach_temperature(self):
        vehicle = ''
        if self.input_daytime == 'daytime':
            vehicle = 'bike'
        if self.input_daytime == 'night':
            vehicle = 'taxi'
        return vehicle
    def out_advice(self):
        visible_leave = self.seach_visibility()
        if visible_leave == 2:
            print('The weatheris good,suitable for use %s.'%self.seach_temperature())
        elif visible_leave == 9:
            print('The weather os bad.you should use %s.'%self.seach_temperature())
        else:
            print('The weather is beyond my scope, I can not give you any adice')

check = OutAdvice('nigt')
check.out_advice()
摘自《python3.5从零开始学》-刘宇宙 编著