@property装饰器

@property可以将一个方法的调用方式编程‘属性调用’：

class E:
    @property
    def salary(self):
        print('salary run.....')
        return 10000

e=E()
print(e.salary)   #这里salary变成了属性调用，以前要e.salary()这样调用
#e.salary=20000 #AttributeError: can't set attribute 报错，不能设置


结果

salary run.....
10000

class Emploree:
    def __init__(self,name,salary):
        self.__name=name
        self.__salary=salary

    def get_salary(self):
        return self.__salary

    def set_salary(self,salary):
        if 1000<salary<50000:
            self.__salary=salary

        else:
            print('错误，重新输入')


emp1=Emploree('Jim',2000)
emp1.set_salary(999)

结果：
错误，重新输入

下面换@property 

class Emploree:
    def __init__(self,name,salary):
        self.__name=name
        self.__salary=salary

    @property
    def salary(self):
        return self.__salary
    @salary.setter
    def salary(self,salary):
        if 1000 < salary < 50000:
            self.__salary = salary

        else:
            print('错误，重新输入')
'''
    def get_salary(self):
        return self.__salary

    def set_salary(self,salary):
        if 1000<salary<50000:
            self.__salary=salary

        else:
            print('错误，重新输入')
'''

emp1=Emploree('Jim',2000)
print(emp1._Emploree__salary)
print(emp1.salary)  #可以直接调用
emp1.salary=10   #报错
emp1.salary=20000   #设置新的值
print(emp1.salary)

结果
2000
2000
错误，重新输入
20000