Patch #685268: Consider a package's __path__ in imputil.

Will backport.

Lib/imputil.py

@@ -552,6 +552,10 @@ class _FilesystemImporter(Importer):
         # This method is only used when we look for a module within a package.
         assert parent
 
+        for submodule_path in parent.__path__:
+            code = self._import_pathname(_os_path_join(submodule_path, modname), fqname)
+            if code is not None:
+                return code
         return self._import_pathname(_os_path_join(parent.__pkgdir__, modname),
                                      fqname)
 

Misc/NEWS

@@ -128,6 +128,8 @@ Core and builtins
 Library
 -------
 
+- Patch #685268: Consider a package's __path__ in imputil.
+
 - Patch 1463026: Support default namespace in XMLGenerator.
 
 - Patch 1571379: Make trace's --ignore-dir facility work in the face of