summary.py

from netaddr import IPNetwork, cidr_merge
import re, sys
try:
	filename = sys.argv[1] 
except:
	print("Please specify a file name for input")
	sys.exit()

with open (filename, "r") as file:
	table = file.read().replace('\n', '')
prefixes = re.findall("(?:\d{1,3}\.){3}\d{1,3}\/\d+", table)
prefix_list = []
for each in prefixes:
	prefix_list.append(IPNetwork(each))
summary_list = cidr_merge(prefix_list)
print('Number of prefixes ', len(prefix_list))
print('Number in summary ', len(summary_list))
print('Summary list:')
for each in summary_list:
	print(each.cidr)