[Zope3-checkins] SVN: Zope3/trunk/src/zope/configuration/config.py Distinguish better between Python code bugs and configuration errors.

[Shane Hathaway]

Log message for revision 28420:
  Distinguish better between Python code bugs and configuration errors.
  
  If configuration refers to a module that does not exist, that's a 
  configuration error.  If the module does exist but an ImportError still 
  occurs, the module was probably partially imported and there is a Python 
  code bug.
  

Changed:
  U   Zope3/trunk/src/zope/configuration/config.py

-=-
Modified: Zope3/trunk/src/zope/configuration/config.py
===================================================================
--- Zope3/trunk/src/zope/configuration/config.py	2004-11-10 20:15:41 UTC (rev 28419)
+++ Zope3/trunk/src/zope/configuration/config.py	2004-11-10 20:19:35 UTC (rev 28420)
@@ -178,6 +178,11 @@
         try:
             mod = __import__(mname, *_import_chickens)
         except ImportError, v:
+            if sys.modules.has_key(mname):
+                # The module was at least partially imported, so there
+                # is probably a bug in some Python code rather than a
+                # configuration error.
+                raise
             raise ConfigurationError, (
                 "Couldn't import %s, %s" % (mname, v)
                 ), sys.exc_info()[2]