implement PyDictMethods

Author: davidhewitt

src/instance.rs

@@ -64,6 +64,17 @@ impl<'py> Py2<'py, PyAny> {
     ) -> PyResult<Self> {
         Py::from_owned_ptr_or_err(py, ptr).map(|obj| Self(py, ManuallyDrop::new(obj)))
     }
+
+    /// Constructs a new Py2 from a borrowed pointer, incrementing the reference count.
+    /// Returns None if ptr is null.
+    ///
+    /// Safety: ptr must be a valid pointer to a Python object, or NULL.
+    pub(crate) unsafe fn from_borrowed_ptr_or_opt(
+        py: Python<'py>,
+        ptr: *mut ffi::PyObject,
+    ) -> Option<Self> {
+        Py::from_borrowed_ptr_or_opt(py, ptr).map(|obj| Self(py, ManuallyDrop::new(obj)))
+    }
 }
 
 impl<'py, T> Py2<'py, T> {