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Asked: 2026-05-12T14:34:39+00:00

I’m wondering if there is a built-in way to do this… Take this simple

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I’m wondering if there is a built-in way to do this… Take this simple code for example:

D = {'one': objectA(), 'two': objectB(), 'three': objectC()}
object_a = D['one']

I believe object_a is just pointing at the objectA() created on the first line, and knows nothing about the dictionary D, but my question is, does Python store the Key of the dictionary value? Is there a way to get the Key 'one' if all you have is the variable object_a (without looping over the dictionary, of course)?

If not, I can store the value 'one' inside objectA(), but I’m just curious if Python already stores that info.

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1 Answer

  1. Editorial Team

    I think no.

    Consider the case of adding a single object to a (large) number of different dictionaries. It would become quite expensive for Python to track that for you, it would cost a lot for a feature not used by most.

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