GCI_port_scanner.py

import socket, threading 

def connect(ip, port_number, delay, output):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.settimeout(delay)
    try:
        sock.connect((ip, port_number))
        output[port_number] = True
    except:
        output[port_number] = False

def scan_ports(host_ip, delay, low, high):
    #N is the number of ports you wanna scan, maximum value is 65535
    output = {}
    #Thread to scan ports
    N = high-low
    threads = [threading.Thread(target=connect, args=(host_ip, i, delay, output)) for i in range(low, high+1)]    
    #Starting thread
    [threads[i].start() for i in range(N)]
    #joining threads
    [threads[i].join() for i in range(N)]

    ports = [x for x in output if output[x]]

    for i in range(len(ports)):
        print(f'{i}: {ports[i]}')

def main():
    host_ip = input("Enter host ip: ")
    delay = int(input("Enter maximum time out: "))
    low, high = map(int, input("Enter the range of ports you wanna scan seprated by a space: ").split())
    assert low>=0
    assert high<=65535
    scan_ports(host_ip, delay, low, high)

if __name__ == "__main__":
    main()