Replace deprecated imp module

The imp module is deprecated since Python 3.4[1] in favor of the new
importlib module. This change replaces usage of that deprecated module.

[1] https://docs.python.org/3/library/imp.html

NOTES:
- This change simplifies the logic, assuming the DJANGO_SETTINGS_MODULE
  environment should be a module name. (The previous implementation
  eventually raises an exception if the name is not a module name but
  anything else like a class name.)

- The imp.find_module method raises ImportError when the module is not
  found. This means the previous implementation never returns
  sys.path[0]. If the module is found the value is replaced and if it
  is not found then the method doesn't return any value but raises
  an exception.

Change-Id: I798f345e729ae974917872ba1f2e43205a660c45

1 files changed, 3 insertions, 10 deletions

diff --git a/openstack_dashboard/management/commands/migrate_settings.py b/openstack_dashboard/management/commands/migrate_settings.py
index b3ee87e9f..bae688154 100644
--- a/openstack_dashboard/management/commands/migrate_settings.py
+++ b/openstack_dashboard/management/commands/migrate_settings.py
@@ -11,7 +11,7 @@
 # under the License.
 
 import difflib
-import imp
+import importlib
 import os
 import shlex
 import subprocess
@@ -30,16 +30,9 @@ def get_module_path(module_name):
     """Gets the module path without importing anything.
 
     Avoids conflicts with package dependencies.
-    (taken from http://github.com/sitkatech/pypatch)
     """
-    path = sys.path
-    for name in module_name.split('.'):
-        file_pointer, path, desc = imp.find_module(name, path)
-        path = [path, ]
-        if file_pointer is not None:
-            file_pointer.close()
-
-    return path[0]
+    spec = importlib.util.find_spec(module_name)
+    return spec.origin
 
 
 class DirContext(object):