Variable from teststand to scapy

Need to pass variable from Teststand to Scapy python script and build the packet in one step. http: Ether()/IP(dst=server)/TCP(dport=80)/"GET /index.html HTTP/1.0"

#!/usr/bin/env python
import sys

Ether()/IP(dst=argv[0])/TCP(dport=argv[1])/argv[2]"

using sys.argv[n], is correct?