# Quick start

Once you downloaded and installed PySNMP library on your Linux/Windows/OS X system, you should be able to solve the very basic SNMP task right from your Python prompt - fetch some data from a remote SNMP Agent (you’d need at least version 4.3.0 to run code from this page).

## Fetch SNMP variable

So just cut&paste the following code right into your Python prompt. The code will performs SNMP GET operation for a sysDescr.0 object at a publically available SNMP Command Responder at demo.snmplabs.com:

    from pysnmp.hlapi import *

    errorIndication, errorStatus, errorIndex, varBinds = next(
        getCmd(SnmpEngine(),
               CommunityData('public', mpModel=0),
               UdpTransportTarget(('demo.snmplabs.com', 161)),
               ContextData(),
               ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)))
    )

    if errorIndication:
        print(errorIndication)
    elif 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]))

`Download` script.

If everything works as it should you will get:

    ...
    SNMPv2-MIB::sysDescr."0" = SunOS zeus.snmplabs.com 4.1.3_U1 1 sun4m
    >>>

on your console.

## Send SNMP TRAP

To send a trivial TRAP message to our hosted Notification Receiver at demo.snmplabs.com , just cut&paste the following code into your interactive Python session:

    from pysnmp.hlapi import *

    errorIndication, errorStatus, errorIndex, varBinds = next(
        sendNotification(
            SnmpEngine(),
            CommunityData('public', mpModel=0),
            UdpTransportTarget(('demo.snmplabs.com', 162)),
            ContextData(),
            'trap',
            NotificationType(
                ObjectIdentity('1.3.6.1.6.3.1.1.5.2')
            ).addVarBinds(
                ('1.3.6.1.6.3.1.1.4.3.0', '1.3.6.1.4.1.20408.4.1.1.2'),
                ('1.3.6.1.2.1.1.1.0', OctetString('my system'))
            )
        )
    )

    if errorIndication:
        print(errorIndication)

`Download` script.

Many ASN.1 MIB files could be downloaded from mibs.snmplabs.com or PySNMP could be configured to download them automatically.

For more sophisticated examples and use cases please refer to examples and library reference pages.