#
# Command Generator
#
# Send SNMP GET request using the following options:
#
# * with SNMPv3, user 'usr-md5-none', securityName 'myuser'
#   MD5 authentication, no privacy
# * over IPv4/UDP
# * to an Agent at demo.snmplabs.com:161
# * for an OID in text form
#
# The securityName parameter can be thought as an alias to userName and
# allows you to address a USM Table row just as userName does. However
# securityName can be made human-readable, also it is not an index in
# usmUserTable, thus duplicate securityName parameters are possible.
#
from pysnmp.entity.rfc3413.oneliner.cmdgen import *

for errorIndication, \
    errorStatus, errorIndex, \
    varBinds in getCmd(SnmpEngine(),
                       UsmUserData('usr-md5-none', 'authkey1',
                                   securityName='myuser'),
                       UdpTransportTarget(('demo.snmplabs.com', 161)),
                       ContextData(),
                       ObjectType(ObjectIdentity('1.3.6.1.2.1.1.1.0'))):
    # Check for errors and print out results
    if errorIndication:
        print(errorIndication)
    else:
        if errorStatus:
            print('%s at %s' % (
                    errorStatus.prettyPrint(),
                    errorIndex and varBinds[int(errorIndex)-1][0] or '?'
                )
            )
        else:
            for varBind in varBinds:
                print(' = '.join([ x.prettyPrint() for x in varBind ]))
    break