how to set within a property other "private" attributes

Asked Jan 08 '18 at 09:05

Active Jan 08 '18 at 09:10

Viewed 24 times

Suppose the following code is given, Python 2.7

class A:
    def __init__(self, x):
        self.x = x

    @property
    def x(self):
        return self.__x

    @x.setter
    def x(self, x):
        self.__x = x
        self._y = self.x**2

We have an attribute x which once it is set / updated should also automatically set/update the attribute _y. _y is only used for internal calculation in other function. So far the motivation. Now if I do the following

>>> mytest = temp.A(2)
>>> mytest._y
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: A instance has no attribute '_y'
>>>

is it not possible to set multiple attributes within via a property?

edited Jan 08 '18 at 09:10

asked Jan 08 '18 at 09:05

math

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In Python 2, you should be using new-style classes, so your class should be declared `class A(object):`. Then your code works fine. – khelwood Jan 08 '18 at 09:09
Also, https://stackoverflow.com/a/1301369/1453822 – DeepSpace Jan 08 '18 at 09:12
@khelwood looks like that fixes it. thx – math Jan 08 '18 at 09:13

how to set within a property other "private" attributes

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