This file is indexed.

/usr/lib/python2.7/dist-packages/PIL/_util.py is in python-pil 2.3.0-1ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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import os

if bytes is str:
    def isStringType(t):
        return isinstance(t, basestring)
    def isPath(f):
        return isinstance(f, basestring)
else:
    def isStringType(t):
        return isinstance(t, str)
    def isPath(f):
        return isinstance(f, (bytes, str))

# Checks if an object is a string, and that it points to a directory.
def isDirectory(f):
    return isPath(f) and os.path.isdir(f)