pyo3 downcasts changed to casts (#65)

* pyo3 downcasts changed to casts

* update changelog

Author: jessekrubin

CHANGELOG.md

@@ -15,6 +15,7 @@ To see unreleased changes, please see the CHANGELOG on the main branch.
   Trait `Runtime` now requires `spawn_blocking` function,
   `future_into_py` functions now require future return type to be `Send`.
   [#60](https://github.com/PyO3/pyo3-async-runtimes/pull/60)
+- Change pyo3 `downcast` calls to `cast` calls [#65](https://github.com/PyO3/pyo3-async-runtimes/pull/65)
 
 ## [0.26.0] - 2025-09-02
 

README.md

@@ -515,7 +515,7 @@ fn main() -> PyResult<()> {
                 assert!(uvloop
                     .bind(py)
                     .getattr("Loop")?
-                    .downcast::<PyType>()
+                    .cast::<PyType>()
                     .unwrap()
                     .is_instance(&pyo3_async_runtimes::async_std::get_current_loop(py)?)?);
                 Ok(())

pytests/test_async_std_asyncio.rs

@@ -158,7 +158,7 @@ async fn test_cancel() -> PyResult<()> {
             assert!(e.value(py).is_instance(
                 py.import("asyncio")?
                     .getattr("CancelledError")?
-                    .downcast::<PyType>()
+                    .cast::<PyType>()
                     .unwrap()
             )?);
             Ok(())
@@ -240,7 +240,7 @@ fn test_local_cancel(event_loop: Py<PyAny>) -> PyResult<()> {
                 assert!(e.value(py).is_instance(
                     py.import("asyncio")?
                         .getattr("CancelledError")?
-                        .downcast::<PyType>()
+                        .cast::<PyType>()
                         .unwrap()
                 )?);
                 Ok(())

pytests/test_async_std_uvloop.rs

@@ -26,15 +26,8 @@ fn main() -> pyo3::PyResult<()> {
         pyo3_async_runtimes::async_std::run(py, async move {
             // verify that we are on a uvloop.Loop
             Python::attach(|py| -> PyResult<()> {
-                assert!(
-                    pyo3_async_runtimes::async_std::get_current_loop(py)?.is_instance(
-                        uvloop
-                            .bind(py)
-                            .getattr("Loop")?
-                            .downcast::<PyType>()
-                            .unwrap()
-                    )?
-                );
+                assert!(pyo3_async_runtimes::async_std::get_current_loop(py)?
+                    .is_instance(uvloop.bind(py).getattr("Loop")?.cast::<PyType>().unwrap())?);
                 Ok(())
             })?;
 

pytests/test_tokio_current_thread_uvloop.rs

@@ -35,15 +35,8 @@ fn main() -> pyo3::PyResult<()> {
         pyo3_async_runtimes::tokio::run(py, async move {
             // verify that we are on a uvloop.Loop
             Python::attach(|py| -> PyResult<()> {
-                assert!(
-                    pyo3_async_runtimes::tokio::get_current_loop(py)?.is_instance(
-                        uvloop
-                            .bind(py)
-                            .getattr("Loop")?
-                            .downcast::<PyType>()
-                            .unwrap()
-                    )?
-                );
+                assert!(pyo3_async_runtimes::tokio::get_current_loop(py)?
+                    .is_instance(uvloop.bind(py).getattr("Loop")?.cast::<PyType>().unwrap())?);
                 Ok(())
             })?;
 

pytests/test_tokio_multi_thread_uvloop.rs

@@ -27,15 +27,8 @@ fn main() -> pyo3::PyResult<()> {
         pyo3_async_runtimes::tokio::run(py, async move {
             // verify that we are on a uvloop.Loop
             Python::attach(|py| -> PyResult<()> {
-                assert!(
-                    pyo3_async_runtimes::tokio::get_current_loop(py)?.is_instance(
-                        uvloop
-                            .bind(py)
-                            .getattr("Loop")?
-                            .downcast::<PyType>()
-                            .unwrap()
-                    )?
-                );
+                assert!(pyo3_async_runtimes::tokio::get_current_loop(py)?
+                    .is_instance(uvloop.bind(py).getattr("Loop")?.cast::<PyType>().unwrap())?);
                 Ok(())
             })?;
 

pytests/tokio_asyncio/mod.rs

@@ -164,7 +164,7 @@ async fn test_cancel() -> PyResult<()> {
             assert!(e.value(py).is_instance(
                 py.import("asyncio")?
                     .getattr("CancelledError")?
-                    .downcast::<PyType>()
+                    .cast::<PyType>()
                     .unwrap()
             )?);
             Ok(())
@@ -216,7 +216,7 @@ fn test_local_cancel(event_loop: Py<PyAny>) -> PyResult<()> {
                     assert!(e.value(py).is_instance(
                         py.import("asyncio")?
                             .getattr("CancelledError")?
-                            .downcast::<PyType>()
+                            .cast::<PyType>()
                             .unwrap()
                     )?);
                     Ok(())