I am unable to replicate this issue with '2to3' from Python 2.7.12, Python 3.4.5, nor Python 3.5.2.
Below is what I get with the versions I mentioned above.
---
$ cat test.py
a.has_key(b) and x
$ 2to3 test.py
RefactoringTool: Skipping optional fixer: buffer
RefactoringTool: Skipping optional fixer: idioms
RefactoringTool: Skipping optional fixer: set_literal
RefactoringTool: Skipping optional fixer: ws_comma
RefactoringTool: Refactored test.py
--- test.py (original)
+++ test.py (refactored)
@@ -1 +1 @@
-a.has_key(b) and x
+b in a and x
RefactoringTool: Files that need to be modified:
RefactoringTool: test.py
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