How can I take my captured information from a network/port scan and write that to a file? - sockets

Question

I wrote an IP and port scanning program and I want to take the captured data and output it to a text file. I've been trying to figure it out for a while and haven't had any luck applying what I can find in searches. At the end, I commented out how I thought it should work to write the information to a file.
Any help or suggestions would be greatly appreciated, I'm still somewhat new to Python and trying to learn.
#!/usr/bin/env python
import ipaddress
import sys, time
import os
import subprocess
import socket
from datetime import datetime
FNULL = open(os.devnull, 'w')
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print ('Welcome to the IP/Port Scanner and Logger')
address = input('Enter starting IP address: ')
split1 = first,second,third,fourth = str(address).split('.')
start = int(fourth)
host = first+'.'+second+'.'+third+'.'+str(start)
end_address = input('Enter the ending IP address: ')
split2 = first,second,third,fourth = str(end_address).split('.')
end = int(fourth)
network = first+'.'+second+'.'+third+'.'
min_port = input("Enter starting port range: ")
max_port = input("Enter ending port range: ")
remoteserver = host
remoteserverIP = socket.gethostbyname(remoteserver)
def port_scan():
print ('Port scanning function initialized:')
try:
for port in range(int(min_port),int(max_port)):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
result = sock.connect_ex((remoteserverIP, port))
if result == 0:
print ('Port ' + str(port) + ': Open')
sock.close()
except KeyboardInterrupt:
print ("You halted the process")
sys.exit()
except socket.gaierror:
print ('Hostname could not be resolved. Exiting')
sys.exit()
except socket.error:
print ("Couldn't connect to server")
sys.exit()
return port
def check_up():
for ip_address in range(int(start), int(end)):
try:
subprocess.check_call(['ping', '-c', '2',
network + str(ip_address)],
stdout=FNULL,stderr=FNULL)
except (OSError, subprocess.CalledProcessError):
print ("{}{}".format(network,ip_address), "is down")
except KeyboardInterrupt:
print ("You halted the process")
sys.exit()
else:
print ("{}{}".format(network,ip_address), "is up")
return ip_address
check_up()
time1 = datetime.now()
time2 = datetime.now()
scantime = time2-time1
print ('Scan completed in: ', scantime)
while True:
print ('Would you like to write information to file?')
answer = input()
if answer in ['yes', 'y', 'yeah']:
print ('Alright, writing to file')
print ('Program will exit upon scan completion.')
break
elif answer in ['no', 'n']:
print ('Okay, exiting now..')
sys.exit()
break
else:
print ('Please enter a yes or no value')
###Output File
##with open('ipscan.txt', 'w+') as ip:
## print (ip_address, port)
##
##sys.exit()