import re   # import python regexp library

with open("dumpfile.txt", "r") as file: # open the file
    lines = file.readlines()            # read lines from file

# at first I thought you want to parse even more parameters

# regular expression
pattern = "(?P<date>.*) IP (?P<senderIP>[\.\d]*)\.(?P<senderPort>\d*) \> (?P<reciverIP>[\.\d]*)\.(?P<recieverPort>\d*): Flags \[(?P<flags>.*)\],.*"

Pkts = {} # {uniqueIP:number of packets associated}

for line in lines:  						# go trought every line and
	result = re.match(pattern, line) 		# match line for every line

	if not Pkts.has_key(result.group("senderIP")): # if this ip was not used then we will set the result to 1
		Pkts[result.group("senderIP")] = 1
	else:										   # in other case we will just add 1
		Pkts[result.group("senderIP")] += 1

	if not Pkts.has_key(result.group("reciverIP")): # same as previous only this time we check for receiver ip adress
		Pkts[result.group("reciverIP")] = 1
	else:
		Pkts[result.group("reciverIP")] += 1

for ip in Pkts.keys():
	print ip, "Number of packets recived/sent:", Pkts[ip]  # just printing the result