#案例：小智今天想出去，但不清楚今天的天氣是否適宜出行，需要一個幫他提供建議的程式，程式要求輸入daytime
#和night，根據可見度和溫度給出出行建議和使用的交通工具，需要考慮需求變更的可能
#需求分析：使用python類的封裝、繼承、多型比較容易實現，由父類封裝檢視可見度和檢視溫度的方法，
#子類繼承父類。若有需要，子類可以覆蓋父類的方法，做自己的實現。子類也可以自定義方法
#
#
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):
        #繼承父類的__init__方法
        WeatherSearch.__init__(self,input_daytime)

        #子類覆蓋父類的方法 多型
    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從零開始學》-劉宇宙 編著