pysnmp mass async command generator

from pysnmp.entity.rfc3413.oneliner import cmdgen

# add your hosts here
#targets = [ '127.0.0.1', '127.0.0.2' ]
targets = ['127.0.0.1']*1000

def cbFun(sendRequestHandle, errorIndication, errorStatus, errorIndex,
          varBinds, cbCtx):
    if errorIndication:
        print(errorIndication)
        return 1
    if errorStatus:
        print('%s at %s' % (
            errorStatus.prettyPrint(),
            errorIndex and varBinds[int(errorIndex)-1] or '?'
            )
        )
        return 1

    for oid, val in varBinds:
        if val is None:
            print(oid.prettyPrint())
        else:
            print('%s = %s' % (oid.prettyPrint(), val.prettyPrint()))

cmdGen  = cmdgen.AsynCommandGenerator()

for transportTarget in targets:
    cmdGen.getCmd(
        cmdgen.CommunityData('public'),
        cmdgen.UdpTransportTarget((transportTarget, 161)),
        ( '1.3.6.1.2.1.1.1.0', ),
        # User-space callback function and its context
        (cbFun, None)
    )

cmdGen.snmpEngine.transportDispatcher.runDispatcher()