pyo3: update to 0.20

[mikelui]

• python: update to pyo3 0.20
• small update for change in PyDict::get_item which now returns a PyResult<Option<&PyAny>> instead of Option<&PyAny>
• removed some unused imports causing build warnings/errors

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[ArthurZucker]

Thanks for opening the PR and sorry for missing it

[alanhdu]

@ArthurZucker @mikelui -- would it be possible to re-open the PR and merge it in? It looks like it got closed as stale but was not actually merged (at least https://github.com/huggingface/tokenizers/blob/main/bindings/python/Cargo.toml#L17 still points to 0.19)

[mikelui]

I planned on updating this before end of week

[Narsil]

LGTM.

@ArthurZucker for confirmation.

[Narsil]

@mikelui what is missing here ?

[mikelui]

@mikelui what is missing here ?

nothing, just wanted to check if there were any tangible changes that would affect merge

[ArthurZucker]

Fine by me thanks!