When looking for an alias, first look for the normalized name (which

still may contain dots), then if that doesn't exist look for the name
with dots replaced by underscores.  This is a little more forgiving.

Lib/encodings/__init__.py

@@ -69,7 +69,9 @@ def search_function(encoding):
                          globals(), locals(), _import_tail)
     except ImportError:
         import aliases
-        modname = aliases.aliases.get(modname, modname)
+        modname = (aliases.aliases.get(modname) or
+                   aliases.aliases.get(modname.replace('.', '_')) or
+                   modname)
         try:
             mod = __import__(modname, globals(), locals(), _import_tail)
         except ImportError: