something going wrong.. code is not working

[anna]

Thanks Buran,
Changes in code as below

#!/usr/bin/python
from easysnmp import Session
# load easysnmp module
community ='public'
#Community for the device
oid ='SNMPv2-MIB::sysDescr.0'
#sysDescr OID
sr_no = 0
with open('DSLAMIP.txt') as ipfile:
#    line = ipfile.readlines()
#    print line
    for line in ipfile:
#        print line
        try:
            session = Session(hostname=line, community=community, version=2)
            snmp_get = session.get(oid)
            result = snmp_get.value.encode('ascii')
            if 'IES1248-51' in result:
                model = 'ZyXEL'
            elif 'ECI' in result:
                model = 'ECI'
            elif 'IP' in result:
                model = 'UT'
            sr_no += 1
            print sr_no+" "+line+ " " +model
        except:
            print('Connection timed out') 

easysnmp session is not working,
Output is:- Connection timed out
Connection timed out
Connection timed out
Connection timed out
Connection timed out
Connection timed out
Connection timed out
Connection timed out
Connection timed out
Connection timed out

whereas :- i am able to do this manually
[root@localhost scripts]# snmpwalk -v2c -c public 10.113.1.1 SNMPv2-MIB::sysDescr.0
SNMPv2-MIB::sysDescr.0 = STRING: ECI telecom HiFOCuS broadband access system