CODEWITHSUNDEEP
pythonclassattributescontrols
Edoardo Zucchelli
Edoardo Zucchelli

Reputation: 77

Pythonic way to control an attribute over another attribute

There is a pythonic way to control attributes? I wan't that the init method is clear, trying to avoid to use a function like:

self.a = check_a_greater_than_b(a)

and avoid to do controls in the init method


def __init__(self, a, b):
    if b > a:
        raise AttributeError('A should be > B')
    else:
        self.a = a
        self.b = b

I was think to use the setter or settattr, can you post me an example please?

Upvotes: 1

Views: 38

Answers (1)

LCMa
LCMa

Reputation: 445

You can do something like this :

class Object():
    def __init__(self, a, b):
        self.b = b
        self.a = a

    @property
    def a(self):
        return self.__a

    @a.setter
    def a(self, a):
        assert a > self.b, "A should be > B"
        self.__a = a

Then you will have :

o = Object(3,2)
o.a = 1
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "<input>", line 12, in a
AssertionError: A should be > B

Upvotes: 1

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