basic port scanner

scanner.py

import socket
import subprocess
import sys
from datetime import datetime

subprocess.call('CLS', shell=True)
remoteServer    = input("Enter a remote host to scan: ")
remoteServerIP  = socket.gethostbyname(remoteServer)
print ("-" * 60)
print ("Please wait, scanning remote host", remoteServerIP)
print ("-" * 60)
t1 = datetime.now()

try:
    for port in range(400,450):  
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        result = sock.connect_ex((remoteServerIP, port))
        if result == 0:
            print ("Port {}: \t Open".format(port))
        sock.close()

except KeyboardInterrupt:
    print ("You pressed Ctrl+C")
    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()
t2 = datetime.now()
total =  t2 - t1
print ('Scanning Completed in: ', total)