python知识:装饰器@property到底有啥用途

class Stranger(object):
    name = 'class name'                #类绑定属性
    def __init__(self, gender=None ):
        self.gender = gender           #对象绑定属性
        self.name = 'new name'         #对象中属性，与类属性的同名拷贝
 
stan = Stranger('male')
print(1,stan.gender)
stan.gender = 'famel'
print(2,stan.gender)
print(3 stan.name)
print( 4, Stranger.name)

class Stranger(object):
    def __init__(self, gender=None ):
        self.gender = gender
 
stan = Stranger('roma')
print(stan.gender)
 
stan.gender = 'Paras'
print(stan.gender)

class Goods():
        def __init__(self,unit_price,weight):
            self.unit_price = unit_price
            self.weight = weight
 
        @property
        def price(self):
            return self.unit_price * self.weight 
 
lemons = Goods(7,4)
print(lemons.price)

class Stranger(object):
    def __init__(self, gender=None, age=None, job=None):
        self.gender = gender
        self._age = age # 这里的成员属性_age需要与成员方法age()区分开
        self.jobb = job
 
    # 读取age
    @property # 实现一个age相关的getter方法
    def age(self):
        return self._age
 
    # 设置age
    @age.setter # 实现一个age相关的setter方法
    def age(self, value):
        if isinstance(value, int):
            self._age = value
        else:
            raise ValueError("'int' type need")
            
 
if __name__ == "__main__":
    # 创建一个“妹子”
    meizi = Stranger()
 
    meizi.age = 18  # 使用时注意是.age，不是._age
    print("年龄:{age}".fORMat(age=meizi.age))

class Person():
    def __init__(self, first_name, last_name):
        self.first = first_name
        self.last = last_name
 
    @property
    def fullname(self):
        return self.first + ' ' + self.last
 
    @fullname.setter
    def fullname(self, name):
        first_name, last_name = name.split()
        self.first = first_name
        self.last = last_name
 
    def email(self):
        return '{}.{}@email.com'.format(self.first, self.last)
 
 
person = Person('zhang', 'san')
print(person.fullname)
print(person.last)
print(person.first)
 
person.fullname = 'li si'
print(person.fullname)
print(person.last)
print(person.first)

class Person():
    def __init__(self, first_name, last_name):
        self.first = first_name
        self.last = last_name
 
    @property
    def fullname(self):
        return self.first + ' ' + self.last
 
    @fullname.setter
    def fullname(self, name):
        first_name, last_name = name.split()
        self.first = first_name
        self.last = last_name
 
    @fullname.deleter
    def fullname(self):
        self.first = None
        self.last = None
 
    def email(self):
        return '{}.{}@email.com'.format(self.first, self.last)
 
 
person = Person('zhang', 'san')
print(person.fullname)
print(person.last)
print(person.first)
 
del person.fullname
 
print(person.last)
print(person.first)

property(fget=None, fset=None, fdel=None, doc=None)

class Stranger(object):
    def __init__(self, gender=None, age=None, job=None):
        self.gender = gender
        self._age = age
        self.jobb = job
 
    # 设置_age
    def set_age(self, age):
        if isinstance(age, int):
            self._age = age
        else:
            raise ValueError("'int' type need")
 
    # 读取_age
    def get_age(self):
        return self._age
    
    # 使得实例化对象可以利用.age方式来访问
    age = property(get_age, set_age)
 
 
if __name__ == "__main__":
    # 创建一个“妹子”
    meizi = Stranger()
 
    meizi.age = 18
    print("年龄:{age}".format(age=meizi.age))