Retrieve a particular http2 stream for packet capture

parsehttp2datastreams.py

#!/usr/bin/env  python 
import pyshark
import sys
cap=pyshark.FileCapture(sys.argv[1])
targetstream=sys.argv[2]

for p in cap:
    if "http2" in p:
        i=0
        for s in p.http2.stream.all_fields:
            val=s.showname_value
            if val.startswith("DATA"):
                if "Stream ID: {}".format(targetstream) in val:
                    sys.stdout.write(p.http2.data_data.all_fields[i].binary_value)
                i+=1