If you run ``echo "import commands" | ./2to3 -f imports -``, you end up
with ``import subprocess``. That's bad as the code in the module works
off of 'commands'. The fix really should be ``import subprocess as
commands``.

Yeah, but then commands will be replaced with subprocess.

$ cat > m
import commands
commands.getoutput()
$ 2to3 m
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: ws_comma
--- m (original)
+++ m (refactored)
@@ -1,2 +1,2 @@
-import commands
-commands.getoutput()
+import subprocess
+subprocess.getoutput()

Gotcha. Here is to hoping that won't cause issues with someone's
variable name being silly.