[issue19152] Add ExtensionFileLoader.get_filename().

Doc/library/importlib.rst

@@ -800,7 +800,7 @@ find and load modules.
 
 .. class:: ExtensionFileLoader(fullname, path)
 
-   A concrete implementation of :class:`importlib.abc.InspectLoader` for
+   A concrete implementation of :class:`importlib.abc.ExecutionLoader` for
    extension modules.
 
    The *fullname* argument specifies the name of the module the loader is to
@@ -834,6 +834,10 @@ find and load modules.
 
       Returns ``None`` as extension modules do not have source code.
 
+   .. method:: get_filename(fullname)
+
+      Returns :attr:`path`.
+
 
 :mod:`importlib.util` -- Utility code for importers
 ---------------------------------------------------

Lib/importlib/_bootstrap.py

@@ -1153,6 +1153,11 @@ class ExtensionFileLoader:
         """Return None as extension modules have no source code."""
         return None
 
+    @_check_name
+    def get_filename(self, fullname):
+        """Return the path to the source file as found by the finder."""
+        return self.path
+
 
 class _NamespacePath:
     """Represents a namespace package's path.  It uses the module name

Lib/importlib/abc.py

@@ -168,6 +168,8 @@ class ExecutionLoader(InspectLoader):
         set to."""
         raise NotImplementedError
 
+_register(machinery.ExtensionFileLoader)
+
 
 class FileLoader(_bootstrap.FileLoader, ResourceLoader, ExecutionLoader):
 

Misc/NEWS

@@ -206,6 +206,8 @@ Library
 - Issue #19151: Fix docstring and use of _get_suppported_file_loaders() to
   reflect 2-tuples.
 
+- Issue #19152: Add ExtensionFileLoader.get_filename().
+
 - Issue #18676: Change 'positive' to 'non-negative' in queue.py put and get
   docstrings and ValueError messages. Patch by Zhongyue Luo