Scan some ports

scanports.py

import socket
import sys


def isOpen(ip, port):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        s.connect((ip, int(port)))
        s.shutdown(2)
        return True
    except Exception as e:
        return False


def get_arg(index, cast=None, default=None):
    try:
        value = sys.argv[index]
        if cast:
            value = cast(value)
        return value
    except IndexError:
        return default


if __name__ == '__main__':
    min_port = get_arg(1, int, 3000)
    max_port = get_arg(2, int, 7000)

    print('Scanning ports {} to {}'.format(min_port, max_port))

    for port in range(min_port, max_port):
        if isOpen('0.0.0.0', str(port)):
            print('Port {} is being used'.format(port))