How to use the slixmpp.xmlstream.ET.Element function in slixmpp

def _py2xml(*args):
    for x in args:
        val = ET.Element("{%s}value" % _namespace)
        if x is None:
            nil = ET.Element("{%s}nil" % _namespace)
            val.append(nil)
        elif type(x) is int:
            i4 = ET.Element("{%s}i4" % _namespace)
            i4.text = str(x)
            val.append(i4)
        elif type(x) is bool:
            boolean = ET.Element("{%s}boolean" % _namespace)
            boolean.text = str(int(x))
            val.append(boolean)
        elif type(x) is str:
            string = ET.Element("{%s}string" % _namespace)
            string.text = x
            val.append(string)
        elif type(x) is float:
            double = ET.Element("{%s}double" % _namespace)
            double.text = str(x)
            val.append(double)
        elif type(x) is rpcbase64:
            b64 = ET.Element("{%s}base64" % _namespace)
            b64.text = x.encoded()
            val.append(b64)
        elif type(x) is rpctime:
            iso = ET.Element("{%s}dateTime.iso8601" % _namespace)
            iso.text = str(x)
            val.append(iso)
        elif type(x) in (list, tuple):
            array = ET.Element("{%s}array" % _namespace)

def add_reported(self, var, ftype=None, label='', desc='', **kwargs):
        kwtype = kwargs.get('type', None)
        if kwtype is None:
            kwtype = ftype
        reported = self.xml.find('{%s}reported' % self.namespace)
        if reported is None:
            reported = ET.Element('{%s}reported' % self.namespace)
            self.xml.append(reported)
        fieldXML = ET.Element('{%s}field' % FormField.namespace)
        reported.append(fieldXML)
        field = FormField(xml=fieldXML)
        field['var'] = var
        field['type'] = kwtype
        field['label'] = label
        field['desc'] = desc
        return field

def set_items(self, values):
        self.del_items()
        for jid in values:
            if jid:
                item = ET.Element('{%s}item' % self.namespace)
                item.attrib['jid'] = JID(jid).full
                self.xml.append(item)

def set_actions(self, values):
        """
        Assign the set of allowable next actions.

        Arguments:
            values -- A list containing any combination of:
                        'prev', 'next', and 'complete'
        """
        self.del_actions()
        if values:
            self._set_sub_text('{%s}actions' % self.namespace, '', True)
            actions = self.xml.find('{%s}actions' % self.namespace)
            for val in values:
                if val in self.next_actions:
                    action = ET.Element('{%s}%s' % (self.namespace, val))
                    actions.append(action)

def py2xml(*args):
    params = ET.Element("{%s}params" % _namespace)
    for x in args:
        param = ET.Element("{%s}param" % _namespace)
        param.append(_py2xml(x))
        params.append(param) #...
    return params

def join_muc(self, room, nick, maxhistory="0", password='', wait=False, pstatus=None, pshow=None, pfrom=None):
        """ Join the specified room, requesting 'maxhistory' lines of history.
        """
        stanza = self.xmpp.make_presence(pto="%s/%s" % (room, nick), pstatus=pstatus, pshow=pshow, pfrom=pfrom)
        x = ET.Element('{http://jabber.org/protocol/muc}x')
        if password:
            passelement = ET.Element('{http://jabber.org/protocol/muc}password')
            passelement.text = password
            x.append(passelement)
        if maxhistory:
            history = ET.Element('{http://jabber.org/protocol/muc}history')
            if maxhistory ==  "0":
                history.attrib['maxchars'] = maxhistory
            else:
                history.attrib['maxstanzas'] = maxhistory
            x.append(history)
        stanza.append(x)
        if not wait:
            self.xmpp.send(stanza)
        else:
            #wait for our own room presence back

def _set_setting(self, setting, value):
        self._del_setting(setting)
        if value in (True, False):
            xml = ET.Element('{%s}%s' % (self.namespace, setting))
            xml.attrib['value'] = 'true' if value else 'false'
            self.xml.append(xml)

def set_first_index(self, val):
        fi = self.xml.find("{%s}first" % (self.namespace))
        if fi is not None:
            if val:
                fi.attrib['index'] = val
            elif 'index' in fi.attrib:
                del fi.attrib['index']
        elif val:
            fi = ET.Element("{%s}first" % (self.namespace))
            fi.attrib['index'] = val
            self.xml.append(fi)