靜態方法，類方法，屬性方法，屬性方法實例

#靜態方法用的少，相當于類的工具包,訪問不了類或實例中的任何屬性
class Dog(object):
    def __init__(self,name):
        self.name=name


    @staticmethod#實際上跟類沒關系了，就只是一個函數了,名義上歸類管
    def eat(self):
        print("%s is eating %s"%(self.name,'dd'))

    def talk(self):
        print("%s is talking"%self.name)
d=Dog("chenronghua")
d.eat(d) #把自己傳到eat函數，使self有效
d.talk()

#類方法基本用不到
class Dog(object):
    name="huazai"
    def __init__(self,name):
        self.name=name
        self.n=2222

    @classmethod #類方法只能訪問類變量，不能訪問實例變量
    def eat(self):
        print("%s is eating %s"%(self.name,'dd'))

    def talk(self):
        print("%s is talking"%self.name)

d=Dog("chenronghua")
d.eat()
d.talk()

#屬性方法

class   Dog(object):
    def __init__(self,name):
        self.name=name

    @property
    def eat(self):
        print("%s is eating %s"%(self.name,'dd'))
    @eat.setter
    def eat(self,food):
        print("set to food:",food)

d=Dog("chenronghua")
d.eat            # @property下面的eat
d.eat="baozi" # @eat.setter 傳入food

--————————————————————————————————————————
class   Dog(object):
    def __init__(self,name):
        self.name=name
        self.__food=None #空變量

    @property   #方法轉屬性(函數轉變量)
    def eat(self):
        print("%s is eating %s"%(self.name,self.__food)) #先傳一個空變量 self.__food
    @eat.setter   #修改 修改food值
    def eat(self,food):  #修改 修改food值
        print("set to food:",food)
        self.__food=food #將food傳入 空變量
    @eat.deleter #刪除
    def eat(self):
        del self.__food
        print("刪完了")

d=Dog("chenronghua")
d.eat            # @property下面的eat
d.eat="baozi" # @eat.setter 傳入food
d.eat           #  "baozi"傳入self.__food,@property下面的 food是"baozi"

del d.eat  # @eat,deleter 刪除eat函數  del self.__food刪除self.__food變量

d.eat   #依然調用@property下的eat 提示刪除了Dog.__food變量 即self.__food
    # @property
    #def eat(self):
     #   print("%s is eating %s"%(self.name,self.__food))

#屬性方法實例

class Flight(object):
    def __init__(self, name):
        self.flight_name = name

    def checking_status(self):
        print("checking flight %s status " % self.flight_name)
        return 2

    @property #航班狀態方法轉變成屬性方法
    def flight_status(self):   
        status = self.checking_status()
        if status == 0:
            print("flight got canceled...")
        elif status == 1:
            print("flight is arrived...")
        elif status == 2:
            print("flight has departured already...")
        else:
            print("cannot confirm the flight status...,please check later")

    @flight_status.setter  # 修改航班狀態
    def flight_status(self, status):
        print("flight %s has changed the flight status to %s"%(self.flight_name,status))

    @flight_status.deleter  # 刪除航班狀態
    def flight_status(self):
        print("status got removed...")


f = Flight("CA980")
f.flight_status
f.flight_status = 2  # 觸發@flight_status.setter
#del f.flight_status  # 觸發@flight_status.deleter