Add PyType::full_name which is tp_name and has an abi3 fallback.

newsfragments/3660.added.md

@@ -0,0 +1 @@
+Added `PyType::full_name` which in contrast to `PyType::name` includes the module name.

pytests/src/misc.rs

@@ -1,13 +1,20 @@
 use pyo3::prelude::*;
+use std::borrow::Cow;
 
 #[pyfunction]
 fn issue_219() {
     // issue 219: acquiring GIL inside #[pyfunction] deadlocks.
     Python::with_gil(|_| {});
 }
 
+#[pyfunction]
+fn get_type_full_name(obj: &PyAny) -> PyResult<Cow<'_, str>> {
+    obj.get_type().full_name()
+}
+
 #[pymodule]
 pub fn misc(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(issue_219, m)?)?;
+    m.add_function(wrap_pyfunction!(get_type_full_name, m)?)?;
     Ok(())
 }

pytests/tests/test_misc.py

@@ -48,3 +48,8 @@ def test_import_in_subinterpreter_forbidden():
         )
 
     _xxsubinterpreters.destroy(sub_interpreter)
+
+def test_type_full_name_includes_module():
+    numpy = pytest.importorskip("numpy")
+
+    assert pyo3_pytests.misc.get_type_full_name(numpy.bool_(True)) == "numpy.bool_"

src/types/typeobject.rs

@@ -1,5 +1,8 @@
 use crate::err::{self, PyResult};
 use crate::{ffi, PyAny, PyTypeInfo, Python};
+use std::borrow::Cow;
+#[cfg(not(any(Py_LIMITED_API, PyPy)))]
+use std::ffi::CStr;
 
 /// Represents a reference to a Python `type object`.
 #[repr(transparent)]
@@ -35,6 +38,29 @@ impl PyType {
         self.getattr(intern!(self.py(), "__qualname__"))?.extract()
     }
 
+    /// Gets the full name including the module of the `PyType`.
+    pub fn full_name(&self) -> PyResult<Cow<'_, str>> {
+        #[cfg(not(any(Py_LIMITED_API, PyPy)))]
+        {
+            let name = unsafe { CStr::from_ptr((*self.as_type_ptr()).tp_name) }.to_str()?;
+
+            Ok(Cow::Borrowed(name))
+        }
+
+        #[cfg(any(Py_LIMITED_API, PyPy))]
+        {
+            let module = self
+                .getattr(intern!(self.py(), "__module__"))?
+                .extract::<&str>()?;
+
+            let name = self
+                .getattr(intern!(self.py(), "__name__"))?
+                .extract::<&str>()?;
+
+            Ok(Cow::Owned(format!("{module}.{name}")))
+        }
+    }
+
     /// Checks whether `self` is a subclass of `other`.
     ///
     /// Equivalent to the Python expression `issubclass(self, other)`.