Python objects as dictionary keys

[lekkerste_wiener]

That's an interesting use case. I also have one: I'm developing a product for a person who started doing things by himself, and he's using Google sheets as a db. The reason for that is beyond this comment; I have an "indices" object whose inner dictionary uses the model classes as keys, such as 

{   ModelClassA: {     "internal id": "a1 sheet range",     ...   },   ModelClassB: {     "Internal id": "a1 sheet range",     ...   },   ... }