CODEWITHSUNDEEP
pythonpython-2.7classproperties
af3ld
af3ld

Reputation: 794

Calling property object from within class?

I am trying to call a property from within its class and get the value. I understand that properties are A.foo.__get__(a), but since the properties are within the instance of the class I am not sure what my a would be. Currently, my attempts return the object and location. This makes sense, but how would I proceed so that it instead returns the value of the property? 

class Burgers(object):

    def __init__(self):
        self.burger1 = self.make_burger_dict('mc')
        self.burger2 = self.make_burger_dict('bk')
        print self.burger1
        # prints {1: <property object at 0x10d51b7e0>, 2: <property object at 0x10d51b7e0>}
        # what I want {1: 'Big Mac', 2: 'Big Mac'}


    @property
    def bk(self):
        return "Whopper"

    @property
    def mc(self):
        return "Big Mac"

    def make_burger_dict(self, key):
        return {
            1: vars(Burgers)[key],
            2: getattr(Burgers, key),
        }

x = Burgers()

I tried 3: eval("self." + key) in the make_burger_dict method, and that creates the desired outcome. However, I've heard to avoid eval, so is there away to do this without using it?

Upvotes: 0

Views: 76

Answers (1)

Brendan Abel
Brendan Abel

Reputation: 37509

I think this is what you want. You shouldn't have to deal with the __get__ nonsense. That's the whole point of creating a descriptor on a class; python handles it automagically.

def make_burger_dict(self, key):
    val = getattr(self, key)
    return {1: val, 2: val}

Upvotes: 3

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