/usr/lib/python3/dist-packages/pyasn1/compat/octets.py is in python3-pyasn1 0.4.2-3.
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# This file is part of pyasn1 software.
#
# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pyasn1/license.html
#
from sys import version_info
if version_info[0] <= 2:
int2oct = chr
# noinspection PyPep8
ints2octs = lambda s: ''.join([int2oct(x) for x in s])
null = ''
oct2int = ord
# TODO: refactor to return a sequence of ints
# noinspection PyPep8
octs2ints = lambda s: [oct2int(x) for x in s]
# noinspection PyPep8
str2octs = lambda x: x
# noinspection PyPep8
octs2str = lambda x: x
# noinspection PyPep8
isOctetsType = lambda s: isinstance(s, str)
# noinspection PyPep8
isStringType = lambda s: isinstance(s, (str, unicode))
# noinspection PyPep8
ensureString = str
else:
ints2octs = bytes
# noinspection PyPep8
int2oct = lambda x: ints2octs((x,))
null = ints2octs()
# noinspection PyPep8
oct2int = lambda x: x
# noinspection PyPep8
octs2ints = lambda x: x
# noinspection PyPep8
str2octs = lambda x: x.encode('iso-8859-1')
# noinspection PyPep8
octs2str = lambda x: x.decode('iso-8859-1')
# noinspection PyPep8
isOctetsType = lambda s: isinstance(s, bytes)
# noinspection PyPep8
isStringType = lambda s: isinstance(s, str)
# noinspection PyPep8
ensureString = bytes
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