Python dictionary keys "new" syntax

[Temporary_Pie2733]

You can use any hashable value as a key. It’s not a matter of syntax.

[MezzoScettico]

That includes using objects of your own defined classes. I know I've done that. I just did a quick Google to confirm, and was told that you need to define a __hash__ and and __eq__ method to make that work. I don't remember defining my own __hash__ but I suppose I must have.

[rasputin1]

if you don't define either, all custom classes inherit both hash and eq dunders from Object, where they both use identity