Enumerate serial ports on Windowns. Taken from http://ottawarobotics.org/subversion/Members/andrzej/PYTHON/PyDaq/src/PyDaq/Sandbox/Eli_Benderskys_demos/SerialMon/eblib/utils.py

gistfile1.py

def enumerate_serial_ports():
    """ Uses the Win32 registry to return an 
        iterator of serial (COM) ports 
        existing on this computer.
    """
    path = 'HARDWARE\\DEVICEMAP\\SERIALCOMM'
    try:
        key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, path)
    except WindowsError:
        raise IterationError

    for i in itertools.count():
        try:
            val = winreg.EnumValue(key, i)
            yield str(val[1])
        except EnvironmentError:
            break