-import os, sys
-
-py_maj = sys.version_info.major
-assert py_maj >= 3
-
# pylint: disable=unused-import
from contextlib import ExitStack, nullcontext
from os import environb as environ
from os import fsdecode, fsencode
from shlex import quote
-
+import os, sys
def hexstr(b):
"""Return hex string (not bytes as with hexlify) representation of b."""