How do I summarise my pcap's parsed info into its different traffic types?

Question

Hi there I am building a packet analysis tool. So far my code simply opens the pcap, parses it and closes the file. The code I have used has been adapted from the dpkt documentation. My pcap test files use different types of traffic (tcp, udp, igmp and http) and I need to be able to summarise each of these traffic flows, ideally being able to identify the traffic type adaptively as new ones appear. I need to include first and last timestamps for each type, a mean packet length and total number of packets. Sorry if it's a beginners question I'm just really struggling to use the dpkt documentation as I'm fairly new to python. At the moment I just have the output set to show the src and dst IP, packet length and timestamp. And help would be appreciated.

import dpkt
import datetime
import socket
import sys
import collections


def inet_string(inet):
    try:
        return socket.inet_ntop(socket.AF_INET, inet)
    except ValueError:
        return socket.inet_ntop(socket.AF_INET6, inet)

'''Function for printing the packet information'''
def print_packets(pcap):
    for ts, buf in pcap:
        # Print out the timestamp in UTC
        print('Timestamp: ', str(datetime.datetime.utcfromtimestamp(ts)))
        # Unpack the Ethernet frame
        eth = dpkt.ethernet.Ethernet(buf)
        # Make sure the Ethernet data contains an IP packet
        if not isinstance(eth.data, dpkt.ip.IP):
            print('Non IP Packet type not supported %s\n' % eth.data.__class__.__name__)
            continue
        # Unpack the IP packet
        ip = eth.data
        # Unpack TCP
        tcp = ip.data
        # Print out the info
        print(f'{inet_string(ip.src)} -> {inet_string(ip.dst)}    Packet Length: {ip.len}')

def main():
    #Test Arguments
    #sys.argv.append('packets1.pcap')
    sys.argv.append('packets2.pcap')
    with open(sys.argv[1], 'rb') as f:
        pcap = dpkt.pcap.Reader(f)
        print_packets(pcap)

if __name__ == '__main__':
    main()