Extract IP address from a text file

extract_ip_address.py

import ipaddress
import re
import sys

def extract_ip_addresses(lines):
    ip_addresses = []
    for line in lines:
        words = line.split()
        for word in words:
            word = re.sub('"', " ", word)
            word = word.strip()
            try:
                ip = ipaddress.ip_address(word)
                ip_addresses.append(ip)
            except ValueError:
                pass
    return ip_addresses

if __name__ == '__main__':
    if len(sys.argv) > 1:
        filename = sys.argv[1]
        with open(filename, 'r') as file:
            lines = file.readlines()
            ips = extract_ip_addresses(lines)
            for ip in ips:
                print(ip)
    else:
        lines = sys.stdin.readlines()
        ips = extract_ip_addresses(lines)
        for ip in ips:
            print(ip)

Example usage with sample.txt file:

➜  $ python3 extract.py sample.txt 
192.168.2.30
202.205.24.0

Pipeline support:

➜  $ grep ciao voila.csv | python3 extract.py
202.142.99.0
203.188.3.9

with voila.csv

➜  findip head voila.csv 
no, name, description
1, ciao, 202.142.99.0
2, chiko, 202.143.98.1
3, ciao, 203.188.3.9