pysnmp prettyPrint() issue on hexadecimal number

I sent snmptrap using following command

sudo snmptrap -v2c -c public '' .1.2.3.4.5.6.7.8.9 ifIndex i 2 ifAdminStatus i 1 1.3.6.1.4.1.9.9.599.1.3.1.1.1.0 x "0x34e2fd600a84"

I used prettyPrint() to format the output value in var binds. The problem is the output doesn't contain the leading zero. So the resulting output is something like

so.org.dod.internet.private.enterprises 9.9.599.1.3.1.1.1.0 = 0x34e2fd60a84

The result output has one 0 less than the original input. Is this a bug in prettyPrint or did I miss something here?

Edit

Here is my implementation. Inside this callback function

# Callback function for receiving notifications
def cbFun(snmpEngine, stateReference, contextEngineId, contextName,varBinds, cbCtx):

I have code block like this:

for name, val in varBinds:
        oid, label, suffix = MIBView.getNodeName(name)
        oidLabel = ".".join(map(str, label))
        oidSuffix = ".".join(map(str, suffix))
        oid_string = oid.prettyPrint()
        value = val.prettyPrint()

The portion value = val.prettyPrint() returns the hex value removing one 0 from two consecutive 0 pattern. So if print value using print value, I would get 0x34e2fd60a84. But I would except to get 0x34e2fd600a84.

Solution

That was a bug in pyasn1, and it was fixed in release 0.1.3 (current release is 0.1.9). You need to upgrade your pyasn1 or monkey-patch it if you can't upgrade for some reason.