From 3b4849a21d691bf95b9d4d4171b60c496e109ae6 Mon Sep 17 00:00:00 2001
From: Vinay Sajip <vinay_sajip@yahoo.co.uk>
Date: Wed, 2 Jun 2010 10:05:31 +0000
Subject: [PATCH] Logging: improved error reporting for
 BaseConfigurator.resolve().

---
 Lib/logging/config.py | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/Lib/logging/config.py b/Lib/logging/config.py
index 07b9d1a8342..356183f5ed0 100644
--- a/Lib/logging/config.py
+++ b/Lib/logging/config.py
@@ -387,15 +387,21 @@ class BaseConfigurator(object):
         """
         name = s.split('.')
         used = name.pop(0)
-        found = self.importer(used)
-        for frag in name:
-            used += '.' + frag
-            try:
-                found = getattr(found, frag)
-            except AttributeError:
-                self.importer(used)
-                found = getattr(found, frag)
-        return found
+        try:
+            found = self.importer(used)
+            for frag in name:
+                used += '.' + frag
+                try:
+                    found = getattr(found, frag)
+                except AttributeError:
+                    self.importer(used)
+                    found = getattr(found, frag)
+            return found
+        except ImportError:
+            e, tb = sys.exc_info()[1:]
+            v = ValueError('Cannot resolve %r: %s' % (s, e))
+            v.__cause__, v.__traceback__ = e, tb
+            raise v
 
     def ext_convert(self, value):
         """Default converter for the ext:// protocol."""