staticmethod classmethod property方法

@staticmethod

静态方法：相当于一个单独的函数，只是名义上归类管，实际上在静态方法里访问不了类或实例中的任何属性，也即跟类没什么关系了。

代码范例：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
class C1(object):
    name = 'ff'
    def __init__(self,name):
        self.name = name
    @classmethod  # 类方法关键字
    def eat(self):
        print('%s is eating %s' % (self.name,'food'))

p = C1('hh')
p.eat()  # 调用类方法

#输出：
hh is eating food

@classmethod

类方法：只能访问类变量（公有属性），不能访问实例变量。

代码范例：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
class C1(object):
    name = 'ff'
    def __init__(self,name):
        self.name = name
    @classmethod  # 类方法关键字
    def eat(self):
        print('%s is eating %s' % (self.name,'food'))

p = C1('hh')
p.eat()  # 调用类方法

#输出：
hh is eating food

@property

属性方法：把一个方法变成一个静态属性。（隐藏实现细节）

代码范例1：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
class C1(object):
    def __init__(self,name):
        self.name = name
        self.__food = None
    @property   # 类属性关键字
    def eat(self):
        print('%s is eating %s' % (self.name,self.__food))
    @eat.setter    # 设置类属性
    def eat(self,food):
        print('set to food: ',food)
        self.__food = food
    @eat.deleter   # 定义类属性删除，不定义无法删除
    def eat(self):
        print('delete succeed!')

p = C1('hh')
p.eat      # 类属性调用
p.eat = 'dd'   # 类属性设置
p.eat

# del p.name
# print(p.name)
del p.eat    # 类属性删除

#输出：
hh is eating None
set to food:  dd
hh is eating dd
delete succeed!

范例2：

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

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

    def checking_status(self):
        print("checking flight %s status " % self.flight_name)
        return  0

    @property
    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
    def flight_status(self,status):
        print("flight status is change to",status)

f = Flight("CA980")
f.flight_status
f.flight_status = 2
#输出
checking flight CA980 status 
flight got canceled...
flight status is change to 2