PyList: remove get_parked_item, use macros for speed on !abi3

CHANGELOG.md

@@ -68,6 +68,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Remove `__doc__` from module's `__all__`. [#1509](https://github.com/PyO3/pyo3/pull/1509)
 - Remove `PYO3_CROSS_INCLUDE_DIR` environment variable and the associated C header parsing functionality. [#1521](https://github.com/PyO3/pyo3/pull/1521)
 - Remove `raw_pycfunction!` macro. [#1619](https://github.com/PyO3/pyo3/pull/1619)
+- Remove `PyList::get_parked_item`. [#1664](https://github.com/PyO3/pyo3/pull/1664)
 
 ### Fixed
 - Remove FFI definition `PyCFunction_ClearFreeList` for Python 3.9 and later. [#1425](https://github.com/PyO3/pyo3/pull/1425)

src/types/dict.rs

@@ -51,7 +51,7 @@ impl PyDict {
 
     /// Returns a new dictionary that contains the same key-value pairs as self.
     ///
-    /// This is equivalent to the Python expression `dict(self)`.
+    /// This is equivalent to the Python expression `self.copy()`.
     pub fn copy(&self) -> PyResult<&PyDict> {
         unsafe {
             self.py()

src/types/list.rs

@@ -15,6 +15,22 @@ pub struct PyList(PyAny);
 
 pyobject_native_type_core!(PyList, ffi::PyList_Type, #checkfunction=ffi::PyList_Check);
 
+#[inline]
+unsafe fn new_from_iter<T>(
+    elements: impl ExactSizeIterator<Item = T>,
+    convert: impl Fn(T) -> PyObject,
+) -> *mut ffi::PyObject {
+    let ptr = ffi::PyList_New(elements.len() as Py_ssize_t);
+    for (i, e) in elements.enumerate() {
+        let obj = convert(e).into_ptr();
+        #[cfg(not(Py_LIMITED_API))]
+        ffi::PyList_SET_ITEM(ptr, i as Py_ssize_t, obj);
+        #[cfg(Py_LIMITED_API)]
+        ffi::PyList_SetItem(ptr, i as Py_ssize_t, obj);
+    }
+    ptr
+}
+
 impl PyList {
     /// Constructs a new list with the given elements.
     pub fn new<T, U>(py: Python<'_>, elements: impl IntoIterator<Item = T, IntoIter = U>) -> &PyList
@@ -22,15 +38,8 @@ impl PyList {
         T: ToPyObject,
         U: ExactSizeIterator<Item = T>,
     {
-        let elements_iter = elements.into_iter();
-        let len = elements_iter.len();
         unsafe {
-            let ptr = ffi::PyList_New(len as Py_ssize_t);
+            py.from_owned_ptr::<PyList>(new_from_iter(elements.into_iter(), |e| e.to_object(py)))
-            for (i, e) in elements_iter.enumerate() {
-                let obj = e.to_object(py).into_ptr();
-                ffi::PyList_SetItem(ptr, i as Py_ssize_t, obj);
-            }
-            py.from_owned_ptr::<PyList>(ptr)
         }
     }
 
@@ -41,8 +50,15 @@ impl PyList {
 
     /// Returns the length of the list.
     pub fn len(&self) -> usize {
-        // non-negative Py_ssize_t should always fit into Rust usize
+        unsafe {
-        unsafe { ffi::PyList_Size(self.as_ptr()) as usize }
+            #[cfg(not(Py_LIMITED_API))]
+            let size = ffi::PyList_GET_SIZE(self.as_ptr());
+            #[cfg(Py_LIMITED_API)]
+            let size = ffi::PyList_Size(self.as_ptr());
+
+            // non-negative Py_ssize_t should always fit into Rust usize
+            size as usize
+        }
     }
 
     /// Checks if the list is empty.
@@ -56,6 +72,9 @@ impl PyList {
     pub fn get_item(&self, index: isize) -> &PyAny {
         assert!((index.abs() as usize) < self.len());
         unsafe {
+            #[cfg(not(Py_LIMITED_API))]
+            let ptr = ffi::PyList_GET_ITEM(self.as_ptr(), index as Py_ssize_t);
+            #[cfg(Py_LIMITED_API)]
             let ptr = ffi::PyList_GetItem(self.as_ptr(), index as Py_ssize_t);
 
             // PyList_GetItem return borrowed ptr; must make owned for safety (see #890).
@@ -64,18 +83,6 @@ impl PyList {
         }
     }
 
-    /// Gets the item at the specified index.
-    ///
-    /// Panics if the index is out of range.
-    pub fn get_parked_item(&self, index: isize) -> PyObject {
-        unsafe {
-            PyObject::from_borrowed_ptr(
-                self.py(),
-                ffi::PyList_GetItem(self.as_ptr(), index as Py_ssize_t),
-            )
-        }
-    }
-
     /// Sets the item at the specified index.
     ///
     /// Panics if the index is out of range.
@@ -167,14 +174,7 @@ where
     T: ToPyObject,
 {
     fn to_object(&self, py: Python<'_>) -> PyObject {
-        unsafe {
+        unsafe { PyObject::from_owned_ptr(py, new_from_iter(self.iter(), |e| e.to_object(py))) }
-            let ptr = ffi::PyList_New(self.len() as Py_ssize_t);
-            for (i, e) in self.iter().enumerate() {
-                let obj = e.to_object(py).into_ptr();
-                ffi::PyList_SetItem(ptr, i as Py_ssize_t, obj);
-            }
-            PyObject::from_owned_ptr(py, ptr)
-        }
     }
 }
 
@@ -192,14 +192,7 @@ where
     T: IntoPy<PyObject>,
 {
     fn into_py(self, py: Python) -> PyObject {
-        unsafe {
+        unsafe { PyObject::from_owned_ptr(py, new_from_iter(self.into_iter(), |e| e.into_py(py))) }
-            let ptr = ffi::PyList_New(self.len() as Py_ssize_t);
-            for (i, e) in self.into_iter().enumerate() {
-                let obj = e.into_py(py).into_ptr();
-                ffi::PyList_SetItem(ptr, i as Py_ssize_t, obj);
-            }
-            PyObject::from_owned_ptr(py, ptr)
-        }
     }
 }
 
@@ -244,19 +237,6 @@ mod test {
         assert_eq!(7, list.get_item(3).extract::<i32>().unwrap());
     }
 
-    #[test]
-    fn test_get_parked_item() {
-        let gil = Python::acquire_gil();
-        let py = gil.python();
-        let v = vec![2, 3, 5, 7];
-        let ob = v.to_object(py);
-        let list = <PyList as PyTryFrom>::try_from(ob.as_ref(py)).unwrap();
-        assert_eq!(2, list.get_parked_item(0).extract::<i32>(py).unwrap());
-        assert_eq!(3, list.get_parked_item(1).extract::<i32>(py).unwrap());
-        assert_eq!(5, list.get_parked_item(2).extract::<i32>(py).unwrap());
-        assert_eq!(7, list.get_parked_item(3).extract::<i32>(py).unwrap());
-    }
-
     #[test]
     fn test_set_item() {
         let gil = Python::acquire_gil();