Question

I was trying to write some code that would check if an item has some attributes , and to call them . I tried to do that with getattr , but the modifications wouldn’t be permanent . I made a ‘dummy’ class to check upon this . Here is the code I used for the class :

 class X:                                             def __init__(self):      self.value = 90      def __get(self):         return self.value    def __set(self,value):      self.value = value      value = property(__get,__set)  x = X() print x.value # this would output 90 getattr(x,'value=',99) # when called from an interactive python interpreter this would output 99 print x.value # this is still 90 ( how could I make this be 99 ? )  

Thanks !

Answer 1

You need to do something like

class X:                                             def __init__(self):      self._value = 90       def _get(self):         return self._value     def _set(self, value):      self._value = value       value = property(_get, _set) 

Note that the ‘internal’ variable has to have a different name than the property (I used _value).

Then,

setattr(x, 'value', 99) 

should work.