Given this code:

import thread
print thread

$ python
ActivePython 2.6.1.1 (ActiveState Software Inc.) based on
Python 2.6.1 (r261:67515, Dec  5 2008, 13:58:38) [MSC v.1500 32 bit
(Intel)] on
win32
>>> from lib2to3.main import main
>>> print open("flip2.py").read()
import thread
print thread

>>> main('lib2to3.fixes', ['flip2.py'])
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skipping implicit fixer: ws_comma
--- flip2.py (original)
+++ flip2.py (refactored)
@@ -1,2 +1,2 @@
-import thread
-print thread
+import _thread
+print(thread)
RefactoringTool: Files that need to be modified:
RefactoringTool: flip2.py
0

Note how "thread" in the print statement is not converted.

This is purposeful. Otherwise random variables, functions, or classes,
with the same name as a module which people were using could be changed.

Understood.  Could the tool emit a warning when it encounters
something like this?

2009/7/17 Eric Promislow <report@bugs.python.org>:
>
> Eric Promislow <ericp@activestate.com> added the comment:
>
> Understood.  Could the tool emit a warning when it encounters
> something like this?

Perhaps, but I think you could find this out just as well by running a
tool like Pylint over your code.