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Updated 4 months ago

Why not `possible_entities = Optional[

AArthur

Why not possible_entities = Optional[List[str]]????

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9 comments

LLogan M

Its not List[str] because its supposed to be

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from typing import Literal

....
possible_relations=Literal["one", "two", ...],

LLogan M

Maybe related to the version of python you are using?

LLogan M

I've never run into this issue actually

AArthur

Yea it was my Python version

AArthur

But why using Literals for that? To make the code more verbose or clear to understand?

LLogan M

So, under the hood its using create_model() from pydantic to create a pydantic model on the fly, and it needs a python type to properly create the field for the pydantic model

However, python does not support creating types on the fly like

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def create(possible_realtions: List[str]):
  Literal[possible_relations]  # <- Failure

So, stuck with making the input a Literal type

AArthur

Thanks. I see now. Have you tried msgspec?

AArthur

May help if I'm not wrong it supports creating an object from a regular Python type

AArthur

class Person(Struct):
name: str

msgspec.iforgotthefunction(["arthur"], type=Person)

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