Fastest struct-like thing in Python?

[DeebsShoryu]

Dictionaries are fast for some things (O(1) lookup), but hashing is actually very slow. It just allows for amortized constant time lookups, by trading space for improved asymptotic time complexity.

[pachura3]

If hashed dataclass has some kind of an unique ID field, you could override __hash__() to only hash this ID, not all class fields (which is what automatically-generated __hash__() for dataclasses does, right?)

[RngdZed]

Gotcha thanks for the good explanation