how do I get an OID from a MIB node ? about snimpy HOT 5 CLOSED

  File ".../aj/qos.py", line 69, in collect
    ooidxx = m.CbQosServicePolicyEntry.proxy.oid
  File ".../venv/lib/python3.7/site-packages/snimpy/manager.py", line 318, in __getattribute__
    m, a = self._locate(attribute)
  File ".../venv/lib/python3.7/site-packages/snimpy/manager.py", line 313, in _locate
    raise AttributeError("{0} is not an attribute".format(attribute))
AttributeError: CbQosServicePolicyEntry is not an attribute

-- The cbQosServicePolicy group

cbQosServicePolicyTable OBJECT-TYPE
    SYNTAX          SEQUENCE OF CbQosServicePolicyEntry 
    MAX-ACCESS      not-accessible
    STATUS          current
    DESCRIPTION
        "This table describes the logical interfaces/media types
        and the policymap that are attached to it."
    ::= { cbQosServicePolicy 1 }

cbQosServicePolicyEntry OBJECT-TYPE
    SYNTAX          CbQosServicePolicyEntry
    MAX-ACCESS      not-accessible
    STATUS          current
    DESCRIPTION
        "Each entry in this table describes to which a logical
        interface a given policymap is attached.  Depending on 
        the logical interface/media type, some fields may have
        meaningful values, and some may not.  Please see each
        individual descriptions."
    INDEX           { cbQosPolicyIndex } 
    ::= { cbQosServicePolicyTable 1 }

CbQosServicePolicyEntry ::= SEQUENCE {
        cbQosPolicyIndex             Unsigned32,
        cbQosIfType                  InterfaceType,
        cbQosPolicyDirection         TrafficDirection,
        cbQosIfIndex                 InterfaceIndex,
        cbQosFrDLCI                  DlciNumber,
        cbQosAtmVPI                  Unsigned32,
        cbQosAtmVCI                  Unsigned32,
        cbQosEntityIndex             EntPhysicalIndexOrZero,
        cbQosVlanIndex               VlanIndex,
        cbQosEVC                     Unsigned32,
        cbQosPolicyDiscontinuityTime TimeStamp,
        cbQosParentPolicyIndex       Unsigned32
}

def get(mib, name):
    """Get a node by its name.

    :param mib: The MIB name to query
    :param name: The object name to get from the MIB
    :return: the requested MIB node (:class:`Node`)
    """
    if not isinstance(mib, bytes):
        mib = mib.encode("ascii")
    module = _get_module(mib)
    if module is None:
        raise SMIException("no module named {0}".format(mib))
    node = _smi.smiGetNode(module, name.encode("ascii"))
    if node == ffi.NULL:
        raise SMIException("in {0}, no node named {1}".format(
            mib, name))
    pnode = _kind2object(node.nodekind)
    return pnode(node)

myoid = mib.get('CISCO-CLASS-BASED-QOS-MIB', 'cbQosServicePolicyEntry').oid
#<class 'tuple'>: (1, 3, 6, 1, 4, 1, 9, 9, 166, 1, 1, 1, 1)