setter method of property decorator not being called

Question

I am trying to use a property method to set the status of a class instance, with the following class definition:

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

From the results though, it seems that the setter method is not being executed, although the internal variable is being changed:

>>> 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"

What am I doing wrong?

Martijn Pieters · Accepted Answer · 2013-03-11 12:37:35Z

On Python 2, you must inherit from object for properties to work:

class Result(object):

to make it a new-style class. With that change your code works:

>>> res = Result(5,6) >>> res.visible False >>> res.visible = True >>> res.currentStatus() 'You can see me!'

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