fn new()

in bindings/python/src/models.rs [443:480]
36 lines of code
6 McCabe index (conditional complexity)

    fn new(
        py: Python<'_>,
        vocab: Option<PyVocab>,
        merges: Option<PyMerges>,
        kwargs: Option<&Bound<'_, PyDict>>,
    ) -> PyResult<(Self, PyModel)> {
        if (vocab.is_some() && merges.is_none()) || (vocab.is_none() && merges.is_some()) {
            return Err(exceptions::PyValueError::new_err(
                "`vocab` and `merges` must be both specified",
            ));
        }

        let mut builder = BPE::builder();
        if let (Some(vocab), Some(merges)) = (vocab, merges) {
            match (vocab, merges) {
                (PyVocab::Vocab(vocab), PyMerges::Merges(merges)) => {
                    let vocab: AHashMap<_, _> = vocab.into_iter().collect();
                    builder = builder.vocab_and_merges(vocab, merges);
                }
                (PyVocab::Filename(vocab_filename), PyMerges::Filename(merges_filename)) => {
                    deprecation_warning(
                    py,
                    "0.9.0",
                    "BPE.__init__ will not create from files anymore, try `BPE.from_file` instead",
                )?;
                    builder =
                        builder.files(vocab_filename.to_string(), merges_filename.to_string());
                }
                _ => {
                    return Err(exceptions::PyValueError::new_err(
                        "`vocab` and `merges` must be both be from memory or both filenames",
                    ));
                }
            }
        }

        PyBPE::with_builder(builder, kwargs)
    }