Pillow/src/PIL/_util.py

import os
import sys

py36 = sys.version_info[0:2] >= (3, 6)


if py36:
    from pathlib import Path

    def isPath(f):
        return isinstance(f, (bytes, str, Path))


else:

    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)


class deferred_error:
    def __init__(self, ex):
        self.ex = ex

    def __getattr__(self, elt):
        raise self.ex