![](/img/trans.png)
[英]Python: Directly access setter method of property when using the @property decorator
[英]setter method of property decorator not being called
我正在嘗試使用屬性方法通過以下類定義來設置類實例的狀態:
class Result:
def __init__(self,x=None,y=None):
self.x = float(x)
self.y = float(y)
self._visible = False
self._status = "You can't see me"
@property
def visible(self):
return self._visible
@visible.setter
def visible(self,value):
if value == True:
if self.x is not None and self.y is not None:
self._visible = True
self._status = "You can see me!"
else:
self._visible = False
raise ValueError("Can't show marker without x and y coordinates.")
else:
self._visible = False
self._status = "You can't see me"
def currentStatus(self):
return self._status
從結果來看,盡管內部變量已更改,但似乎未執行setter方法:
>>> res = Result(5,6)
>>> res.visible
False
>>> res.currentStatus()
"You can't see me"
>>> res.visible = True
>>> res.visible
True
>>> res.currentStatus()
"You can't see me"
我究竟做錯了什么?
在Python 2上, 必須繼承自object
才能使屬性起作用:
class Result(object):
使它成為一種新型的類。 進行此更改后,您的代碼將起作用:
>>> res = Result(5,6)
>>> res.visible
False
>>> res.visible = True
>>> res.currentStatus()
'You can see me!'
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.