Pillow/src/PIL/_util.py

import os
import sys

py3 = sys.version_info.major >= 3
py36 = sys.version_info[0:2] >= (3, 6)

if py3:
    def isStringType(t):
        return isinstance(t, str)

    if py36:
        from pathlib import Path

        def isPath(f):
            return isinstance(f, (bytes, str, Path))
    else:
        def isPath(f):
            return isinstance(f, (bytes, str))
else:
    def isStringType(t):
        return isinstance(t, basestring)  # noqa: F821

    def isPath(f):
        return isinstance(f, basestring)  # noqa: F821


# 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(object):
    def __init__(self, ex):
        self.ex = ex

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