1 files changed, 18 insertions, 0 deletions
diff --git a/django/utils/module_loading.py b/django/utils/module_loading.py
index 55d89caa46..5dc3aefe75 100644
--- a/django/utils/module_loading.py
+++ b/django/utils/module_loading.py
@@ -148,3 +148,21 @@ else:
         else:
             # Exhausted the search, so the module cannot be found.
             return False
+
+
+def module_dir(module):
+    """
+    Find the name of the directory that contains a module, if possible.
+
+    Raise ValueError otherwise, e.g. for namespace packages that are split
+    over several directories.
+    """
+    # Convert to list because _NamespacePath does not support indexing on 3.3.
+    paths = list(getattr(module, '__path__', []))
+    if len(paths) == 1:
+        return paths[0]
+    else:
+        filename = getattr(module, '__file__', None)
+        if filename is not None:
+            return os.path.dirname(filename)
+    raise ValueError("Cannot determine directory containing %s" % module)