Implementing object equality based on a string-valued key in the object's dictionary

Asked Feb 13 '13 at 15:06

Active Feb 13 '13 at 15:06

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I have created a class.

class DictToObject(object):
    def __init__(self, entries): 
        self.__dict__.update(entries)

    def id(self):
        keyColumn = self['KEY_COL_TX']
        keyValue = self[keyColumn]
        return keyValue # a string

The instances of this class are to be considered equal if o1.id() equals o2.id()

But I dont think it is possible to create a unique integer for all string values, so I need some other way to compare object equality without using __hash__()

asked Feb 13 '13 at 15:06

Terrence Brannon

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`def __eq__(self,other): return self.id() == other.id()` – Jakub M. Feb 13 '13 at 15:09
`__hash__` is no use for equality anyway, as collisions are to be expected (in fact unavoidable for most objects). – Feb 13 '13 at 15:09
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You're class doesn't support `__getitem__` ... – mgilson Feb 13 '13 at 15:10
I don't get why you want to "cast" the string to an integer. – Bakuriu Feb 13 '13 at 15:49
Does this answer your question? [Elegant ways to support equivalence ("equality") in Python classes](https://stackoverflow.com/questions/390250/elegant-ways-to-support-equivalence-equality-in-python-classes) – Behdad Abdollahi Moghadam Oct 05 '21 at 12:58

Implementing object equality based on a string-valued key in the object's dictionary

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