py: upgrade to pyo3 0.21

instant-segment-py/Cargo.toml

@@ -18,5 +18,5 @@ crate-type = ["cdylib"]
 [dependencies]
 bincode = "1.3.2"
 instant-segment = { version = "0.11", path = "../instant-segment", features = ["with-serde"] }
-pyo3 = { version = "0.20", features = ["extension-module"] }
+pyo3 = { version = "0.21", features = ["extension-module"] }
 smartstring = "1"

instant-segment-py/src/lib.rs

@@ -5,14 +5,15 @@ use std::fs::File;
 use std::io::{BufReader, BufWriter};
 
 use pyo3::exceptions::PyValueError;
-use pyo3::types::{PyIterator, PyModule};
-use pyo3::{pyclass, pymethods, pymodule};
+use pyo3::pybacked::PyBackedStr;
+use pyo3::types::{PyAnyMethods, PyIterator, PyModule};
+use pyo3::{pyclass, pymethods, pymodule, Bound};
 use pyo3::{PyErr, PyRef, PyRefMut, PyResult, Python};
 use smartstring::alias::String as SmartString;
 
 #[pymodule]
 #[pyo3(name = "instant_segment")]
-fn instant_segment_py(_: Python, m: &PyModule) -> PyResult<()> {
+fn instant_segment_py(_: Python, m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_class::<Search>()?;
     m.add_class::<Segmenter>()?;
     Ok(())
@@ -31,23 +32,29 @@ impl Segmenter {
     /// The `unigrams` iterator should yield `(str, float)` items, while the `bigrams`
     /// iterator should yield `((str, str), float)` items.
     #[new]
-    fn new(unigrams: &PyIterator, bigrams: &PyIterator) -> PyResult<Self> {
+    fn new(unigrams: &Bound<'_, PyIterator>, bigrams: &Bound<'_, PyIterator>) -> PyResult<Self> {
         let unigrams = unigrams
-            .map(|item| {
-                let item = item?;
-                let key = item.get_item(0)?.extract::<&str>()?;
-                let val = item.get_item(1)?.extract::<f64>()?;
+            .iter()?
+            .map(|result| {
+                let item = result?;
+                let key = item.get_item(0)?;
+                let key = key.extract::<&str>()?;
+                let val = item.get_item(1)?;
+                let val = val.extract::<f64>()?;
                 Ok((SmartString::from(key), val))
             })
             .collect::<Result<Vec<_>, PyErr>>()?;
 
         let bigrams = bigrams
+            .iter()?
             .map(|item| {
                 let item = item?;
 
                 let key = item.get_item(0)?;
-                let first = key.get_item(0)?.extract::<&str>()?;
-                let second = key.get_item(1)?.extract::<&str>()?;
+                let first = key.get_item(0)?;
+                let first = first.extract::<&str>()?;
+                let second = key.get_item(1)?;
+                let second = second.extract::<&str>()?;
 
                 let val = item.get_item(1)?.extract::<f64>()?;
                 Ok(((SmartString::from(first), SmartString::from(second)), val))
@@ -99,11 +106,12 @@ impl Segmenter {
     ///
     /// Returns the relative probability for the given sentence in the the corpus represented by
     /// this `Segmenter`. Will return `None` iff given an empty iterator argument.
-    fn score_sentence(&self, words: &PyIterator) -> PyResult<Option<f64>> {
+    fn score_sentence(&self, words: &Bound<'_, PyIterator>) -> PyResult<Option<f64>> {
         let words = words
-            .map(|s| s?.extract::<&str>())
+            .iter()?
+            .map(|result| result?.extract::<PyBackedStr>())
             .collect::<Result<Vec<_>, _>>()?;
-        Ok(self.inner.score_sentence(words.into_iter()))
+        Ok(self.inner.score_sentence(words.iter().map(|s| &**s)))
     }
 }