Merge CIDR blocks into super blocks if possible

cidr.py

#!/usr/bin/env python
#
# Example 1: All blocks in list.txt, one CIDR per line
#   cat list.txt | cidr.py (linux)
#   type list.txt | cidr.py (Windows)
#
# Example 2: Echo CIDR blocks to stdout
#   echo 1.2.3.0/25 1.2.3.128/25 | cidr.py

# Adjusted python print to print() to work with my python 3.5 on Windows.
# Added routine so I could feed it multiple input text files as arguments to merge
# Usage cidr.py Input1.txt Input2.txt ... InputN.txt > OutputMerged.txt
# Example 3: Read CIDR blocks from txt files and output to a txt file
#   cidr.py list1.txt list2.txt list3.txt > outputList.txt

import sys
from netaddr import *
import os

#If argument list is more than just pythone file assume reading from files and not stdin
if(len(sys.argv) > 1): 
	# Save Argument List to file to get rid of pythone file
	ArgumentsList = sys.argv
	ArgumentsList.pop(0)
	# Setup empty list for looping through argument files
	InputDataList = []
	# Loop through all argument files and append to list
	for x in ArgumentsList:
		with open(x,'r') as f:
			InputDataList.extend(f.readlines())
else :
	# Read from stdin
	InputDataList = sys.stdin.readlines()



if len(InputDataList) == 1:
    # Input from echo
    InputDataList = InputDataList[0].split()

# Create an IPSet of the CIDR blocks
# IPSet automatically runs cidr_merge
nets = IPSet(InputDataList)


# Output the superset of CIDR blocks
for cidr in nets.iter_cidrs():
    print (cidr)