IPs Extractor from Files

# this tools can be used to extracting ips from a files that contain other string apart from ip
import re

def extactip():
    opener = open('SAMPLE.txt', 'r').read()
    getips = re.findall(r'\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b', opener)
    for i in getips:
        print(i)
        open('IPs-List.txt', 'a').write(i + "\n")
extactip()