Add a hint on using intern! to Py{,Any}::{set,get}attr.

src/instance.rs

@@ -534,6 +534,9 @@ impl<T> Py<T> {
     /// Retrieves an attribute value.
     ///
     /// This is equivalent to the Python expression `self.attr_name`.
+    ///
+    /// If calling this method becomes performance-critical, using the [`intern!`] macro can be
+    /// used to intern `attr_name` thereby avoid repeated temporary allocations of Python strings.
     pub fn getattr<N>(&self, py: Python<'_>, attr_name: N) -> PyResult<PyObject>
     where
         N: ToPyObject,
@@ -546,6 +549,9 @@ impl<T> Py<T> {
     /// Sets an attribute value.
     ///
     /// This is equivalent to the Python expression `self.attr_name = value`.
+    ///
+    /// If calling this method becomes performance-critical, using the [`intern!`] macro can be
+    /// used to intern `attr_name` thereby avoid repeated temporary allocations of Python strings.
     pub fn setattr<N, V>(&self, py: Python<'_>, attr_name: N, value: V) -> PyResult<()>
     where
         N: ToPyObject,

src/types/any.rs

@@ -111,6 +111,9 @@ impl PyAny {
     /// Retrieves an attribute value.
     ///
     /// This is equivalent to the Python expression `self.attr_name`.
+    ///
+    /// If calling this method becomes performance-critical, using the [`intern!`] macro can be
+    /// used to intern `attr_name` thereby avoid repeated temporary allocations of Python strings.
     pub fn getattr<N>(&self, attr_name: N) -> PyResult<&PyAny>
     where
         N: ToPyObject,
@@ -124,6 +127,9 @@ impl PyAny {
     /// Sets an attribute value.
     ///
     /// This is equivalent to the Python expression `self.attr_name = value`.
+    ///
+    /// If calling this method becomes performance-critical, using the [`intern!`] macro can be
+    /// used to intern `attr_name` thereby avoid repeated temporary allocations of Python strings.
     pub fn setattr<N, V>(&self, attr_name: N, value: V) -> PyResult<()>
     where
         N: ToBorrowedObject,