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djc@enrai src $ ls -l test/*
-rw-r--r-- 1 djc users 34 Jun 2 16:00 test/http.py
-rw-r--r-- 1 djc users 0 Jun 2 16:00 test/__init__.py
djc@enrai src $ cat test/http.py
from httplib import BadStatusLine
djc@enrai src $ 2to3 test/*
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skipping implicit fixer: ws_comma
--- test/http.py (original)
+++ test/http.py (refactored)
@@ -1,1 +1,1 @@
-from httplib import BadStatusLine
+from .http.client import BadStatusLine
RefactoringTool: Files that need to be modified:
RefactoringTool: test/http.py
... which doesn't work, of course. On the other hand, http.py is not in a package, it works correctly. If test/http.py is moved to test/blah.py instead, it also works correctly. 2to3 should be able to conclude that the "httplib" it was before did not refer to .http, but refered to http.client.

Just in case it isn't clear: this is because of the order of fixes. The first fixer replaces httplib with http.client, then the next fixer thinks this is a relative import.

And this has been fixed in the lastest versions of 2to3.