How to detect if code is python 3 compatible

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Basic validation would be if the 2to3 tool prints any diffs (s. https://docs.python.org/3/library/2to3.html for basic usage)

on a simple file like a.py:

import urllib2

print "printing something"

you’d get:

> 2to3 a.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 a.py
--- a.py    (original)
+++ a.py    (refactored)
@@ -1,4 +1,4 @@
-import urllib2
+import urllib.request, urllib.error, urllib.parse

-print "printing something"
+print("printing something")

RefactoringTool: Files that need to be modified:
RefactoringTool: a.py

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