python中@property和property函数常见使用方法示例

class Person(object):
  @property
  def get_name(self):
    print('我叫xxx')
def main():
  person = Person()
  person.get_name
if __name__ == '__main__':
  main()

class Goods(object):
  @property
  def price(self):
    print('@property')
  @price.setter
  def price(self,value):
    print('@price.setter:'+str(value))
  @price.deleter
  def price(self):
    print('@price.deleter')
obj = Goods()
obj.price = 50
obj.price
del obj.price

class Goods(object):
  def __init__(self):
    #原价
    self.original_price = 100
    #折扣
    self.discount = 0.8
  @property
  def price(self):
    #实际价格=原价*折扣
    new_price = self.original_price*self.discount
    return new_price
  @price.setter
  def price(self,value):
    self.original_price = value
  @price.deleter
  def price(self):
    del self.original_price
obj = Goods()
obj.price
obj.price = 200
del obj.price

class Foo(object):
  def get_name(self):
    print('get_name')
    return 'laowang'
  def set_name(self, value):
    '''必须两个参数'''
    print('set_name')
    return 'set value' + value
  def del_name(self):
    print('del_name')
    return 'laowang'
  NAME = property(get_name, set_name, del_name, 'description.')
obj = Foo()
obj.NAME  #调用get方法
obj.NAME = 'alex'  #调用set方法
desc = Foo.NAME.__doc__   #调用第四个描述
print(desc)
del obj.NAME  #调用第三个删除方法

class Person(object):
  def __init__(self, age):
    self.__age = age
  def set_age(self, value):
    self.__age = value
  def get_age(self):
    return self.__age
  AGE = property(get_age, set_age)
person = Person(15)
person.AGE = 20
print(str(person.AGE))