/usr/lib/python2.7/dist-packages/backports.functools_lru_cache-1.3-nspkg.pth is in python-backports.functools-lru-cache 1.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | import sys, types, os;pep420 = sys.version_info > (3, 3);p = os.path.join(sys._getframe(1).f_locals['sitedir'], *('backports',));ie = os.path.exists(os.path.join(p,'__init__.py'));m = not ie and not pep420 and sys.modules.setdefault('backports', types.ModuleType('backports'));mp = (m or []) and m.__dict__.setdefault('__path__',[]);(p not in mp) and mp.append(p)
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