Pyhton Port Scanner

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#==============MODULES================#
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from datetime import *
import socket


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#==============VARIABLES==============#
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start = 0
end = 0
menus = ["(1) Scan by IP", "(2) Scan by Hostname", "(3) Exit            "]
line = "=" * 55

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#==============FUNCTIONS==============#
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#defines menu
def menu(parameter):
    print "     +====================+"
    print "     | PORT SCANNER MENU  |"
    print "     |====================|"
    for word in parameter:
        print "     |%s|" % word
        print "     |-------------------|"

def elapsed(start, end):
    final = (end - start)
    print "Scan Completed In: %s" % final

def scanner(ip, line):
    low_port = input("Please enter a low port number: ")
    high_port = input("Please enter a high port number: ")
    hostname = socket.gethostbyaddr(ip) #get hostname from ip

    #change variable start to current time
    global start
    start = datetime.now()

    #create info bar
    print
    print line * 50
    print "Scanning IP: %s Hostname: %s" % (ip, hostname)
    print line * 50

    #iterate through ports and see if socket connection is established
    for port in range(low_port, (high_port + 1)):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        result = s.connect_ex((ip, port))
        if result == 0:
            print "Port %s: Open" % port
        s.close()

    #change variable end to current time
    global end
    end = datetime.now()

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#=============MAIN PROGRAM============#
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def main():
    menu(menus)
    choice = input("Please make a selection(1-3): ")

    #IP
    if choice == 1:
        ip = raw_input("Please enter an IP to scan: ")
        scanner(ip, line)
        elapsed(start, end)
    #Hostname
    elif choice == 2:
        parameter = raw_input("Please enter a hostname to scan: ")
        ip = socket.gethostbyname(parameter) #convert hostname to ip
        scanner(ip, line)
        elapsed(start, end)
    #Exit
    elif choice == 3:
        print "Exiting Program. Goodbye"
        return

    #Fault
    else:
        print "Invalid Selection"
        return main()


main()