# check identifier and sequence number
if icmpv6.id != echo_id or icmpv6.seq != echo_seq:
raise RuntimeError(
- 'Invalid ICMPv6 echo reply received ID {0} seq {1} should be ' +
+ 'Invalid ICMPv6 echo reply received ID {0} seq {1} should be ' \
'ID {2} seq {3}'.format(icmpv6.id, icmpv6.seq, echo_id, echo_seq))
# verify checksum