/usr/lib/python2.7/lib2to3/tests/ is in libpython2.7-testsuite 2.7.6-8.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/lib2to3/tests/__init__.py
/usr/lib/python2.7/lib2to3/tests/data/
/usr/lib/python2.7/lib2to3/tests/data/README
/usr/lib/python2.7/lib2to3/tests/data/bom.py
/usr/lib/python2.7/lib2to3/tests/data/crlf.py
/usr/lib/python2.7/lib2to3/tests/data/different_encoding.py
/usr/lib/python2.7/lib2to3/tests/data/false_encoding.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/
/usr/lib/python2.7/lib2to3/tests/data/fixers/bad_order.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/myfixes/
/usr/lib/python2.7/lib2to3/tests/data/fixers/myfixes/__init__.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/myfixes/fix_explicit.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/myfixes/fix_first.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/myfixes/fix_last.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/myfixes/fix_parrot.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/myfixes/fix_preorder.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/no_fixer_cls.py
/usr/lib/python2.7/lib2to3/tests/data/fixers/parrot_example.py
/usr/lib/python2.7/lib2to3/tests/data/infinite_recursion.py
/usr/lib/python2.7/lib2to3/tests/data/py2_test_grammar.py
/usr/lib/python2.7/lib2to3/tests/data/py3_test_grammar.py
/usr/lib/python2.7/lib2to3/tests/pytree_idempotency.py
/usr/lib/python2.7/lib2to3/tests/support.py
/usr/lib/python2.7/lib2to3/tests/test_all_fixers.py
/usr/lib/python2.7/lib2to3/tests/test_fixers.py
/usr/lib/python2.7/lib2to3/tests/test_main.py
/usr/lib/python2.7/lib2to3/tests/test_parser.py
/usr/lib/python2.7/lib2to3/tests/test_pytree.py
/usr/lib/python2.7/lib2to3/tests/test_refactor.py
/usr/lib/python2.7/lib2to3/tests/test_util.py