property属性:自动调用get、set方法每次调用隐藏的数据,都用get和set方法写的字符太长,就用property解决。方法一:使用property()函数升级get、set方法 源代码:class Money(object): def __init__(self): self.__money = https://www.shuzhiduo.com/A/WpdKy6kNJV/0 def get_money(self): return self.__money def set_money(self, value): if isinstance(value, int): self.__money = value else: print(“error:不是整型的数字”) # 定义一个属性money,通过这个属性自动识别,并调用适用的方法。 money = property(get_money, set_money) # 自动识别是get取值,还是set赋值m1 = Money()print(m1.money) # 自动识别,并调用get_money方法m1.money = 1https://www.shuzhiduo.com/A/WpdKy6kNJV/0https://www.shuzhiduo.com/A/WpdKy6kNJV/0 # 自动识别,并调用set_money方法print(m1.money) 方法二:property属性-装饰器 源代码:class Money(object): def __init__(self): self.__money = https://www.shuzhiduo.com/A/WpdKy6kNJV/0 @property # 相当于get方法,必须写在set方法前面 def money(self): return self.__money @money.setter # 相当于set方法,必须写在get方法后面 def money(self, value): if isinstance(value, int): self.__money = value else: print(“error:不是整型的数字”) # 自动识别是get取值,还是set赋值m1 = Money()print(m1.money) # 自动识别,并调用money的get方法m1.money = 1https://www.shuzhiduo.com/A/WpdKy6kNJV/0https://www.shuzhiduo.com/A/WpdKy6kNJV/0 # 自动识别,并调用money的set方法print(m1.money) 方法3:
def _get_url(self):
return self._url def _set_url(self, url):
if isinstance(url, str):
self._url = url
else:
raise TypeError('%s url must be str, got %s:' % (type(self).__name__,
type(url).__name__)) url = property(_get_url, obsolete_setter(_set_url, 'url'))
def _get_body(self):
return self._body def _set_body(self, body):
if body is None:
self._body = b''
elif not isinstance(body, bytes):
raise TypeError(
"Response body must be bytes. "
"If you want to pass unicode body use TextResponse "
"or HtmlResponse.")
else:
self._body = body body = property(_get_body, obsolete_setter(_set_body, 'body'))
方法4:只有get方法
@property
def meta(self):
try:
return self.request.meta
except AttributeError:
raise AttributeError(
"Response.meta not available, this response "
"is not tied to any request"
)