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from sys import version_info
if version_info[0] <= 2:
int2oct = chr
ints2octs = lambda s: ''.join([ int2oct(x) for x in s ])
null = ''
oct2int = ord
octs2ints = lambda s: [ oct2int(x) for x in s ]
str2octs = lambda x: x
octs2str = lambda x: x
isOctetsType = lambda s: isinstance(s, str)
isStringType = lambda s: isinstance(s, (str, unicode))
else:
ints2octs = bytes
int2oct = lambda x: ints2octs((x,))
null = ints2octs()
oct2int = lambda x: x
octs2ints = lambda s: [ x for x in s ]
str2octs = lambda x: x.encode()
octs2str = lambda x: x.decode()
isOctetsType = lambda s: isinstance(s, bytes)
isStringType = lambda s: isinstance(s, str)
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