Strange behaviour of OctetString with hexvalue

[banjaxedben]

Python 3.6.8, pysnmp 4.4.11 Ref: http://snmplabs.com/pysnmp/docs/api-reference.html#octetstring-type

>>> from pysnmp.proto.rfc1902 import OctetString

>>> OctetString(hexvalue='000A14000000')
<OctetString schema object, tagSet <TagSet object, tags 0:0:4>, subtypeSpec <ConstraintsIntersection object, consts <ValueSizeConstraint object, consts 0, 65535>>, hexvalue 000A14000000, encoding iso-8859-1>

>>> l = [OctetString(hexValue='000A14000000')]
>>> l
[<OctetString value object, tagSet <TagSet object, tags 0:0:4>, subtypeSpec <ConstraintsIntersection object, consts <ValueSizeConstraint object, consts 0, 65535>>, encoding iso-8859-1, payload [0x000a14000000]>]

>>> d = {'1.3.6.1.2.1.2.2.1.6.1': OctetString(hexValue='000A14000000')}
>>> d
{'1.3.6.1.2.1.2.2.1.6.1': <OctetString value object, tagSet <TagSet object, tags 0:0:4>, subtypeSpec <ConstraintsIntersection object, consts <ValueSizeConstraint object, consts 0, 65535>>, encoding iso-8859-1, payload [0x000a14000000]>}

i.e. When using OctetString directly on a string, I get "hexvalue 000A14000000". When using OctetString inside an iterable, I get "payload [0x000a14000000]".

Can you explain this?

[etingof]

You are using the wrong keyword argument - hexvalue, should be hexValue. That causes uninitialized OctetString object.