human
Complete this python program:
def launch(dpid, port, port_eth=None, name=None, __INSTANCE__=None):
assistant
#Here is the Python code you requested.

    """Launch
    port_eth unspecified: "DPID MAC"
    port_eth enabled: Port MAC
    port_eth specified: Use that
    """
    if (port_eth in (True, None)):
        pass
    else:
        port_eth = EthAddr(port_eth)
    dpid = str_to_dpid(dpid)
    try:
        port = int(port)
    except:
        pass
    def dhcpclient_init():
        n = name
        if (n is None):
            s = ''
            while True:
                if (not core.hasComponent(('DHCPClient' + s))):
                    n = ('DHCPClient' + s)
                    break
                s = str((int(('0' + s)) + 1))
        elif core.hasComponent(n):
            self.log.error('Already    have    component    %s', n)
            return
        client = DHCPClient(port=port, dpid=dpid, name=n, port_eth=port_eth)
        core.register(n, client)
    core.call_when_ready(dhcpclient_init, ['openflow'])