How to use the pybit.models.checkValue function in pybit

def connect(self):
        # for catbells
        if (checkValue('password',self.settings)):
            if (checkValue('hostname',self.settings) and checkValue('port',self.settings)):
                # remote with password
                self.log.debug("REMOTE WITH PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],
                user=self.settings['user'], host=self.settings['hostname'],
                port=self.settings['port'], password=self.settings['password'])
            else:
                # local with password
                self.log.debug("LOCAL WITH PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],
                user=self.settings['user'], password=self.settings['password'])
        else:
            if (checkValue('hostname',self.settings) and checkValue('port',self.settings)):
                # remote without password
                self.log.debug("REMOTE WITHOUT PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],user=self.settings['user'], host=self.settings['hostname'],port=self.settings['port'])
            else:

if not retval :
                command = "sbuild -n --apt-update -d %s %s/%s_%s.dsc" % (chroot_name, srcdir,
                    buildreq.get_package(), buildreq.get_version())
                ret = pybitclient.run_cmd (command, self.settings["dry_run"], logfile)
                if (ret == 3 or ret == 768):
                    retval = "build-dep-wait"
                elif (ret):
                    retval = "build_binary"
            if not retval :
                changes = "%s/%s_%s_%s.changes" % (self.settings["buildroot"],
                    buildreq.get_package(), buildreq.get_version(),
                    buildreq.get_arch())
                if not self.settings["dry_run"] and not os.path.isfile (changes) :
                    logging.warn ("E: build_slave: Failed to find %s file." % (changes))
                    retval = "build_changes"
                if not retval and checkValue ('debsignkey', self.settings) :
                    command = "debsign -k%s %s" % (self.settings['debsignkey'], changes)
                    if pybitclient.run_cmd (command, self.settings["dry_run"], logfile):
                        retval = "build_sign"
        else:
            retval = "Can't find build dir."
                #If we have a message set we send back the message and failure

        return self._overall_success(retval, conn_data)

def connect(self):
        # for catbells
        if (checkValue('password',self.settings)):
            if (checkValue('hostname',self.settings) and checkValue('port',self.settings)):
                # remote with password
                self.log.debug("REMOTE WITH PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],
                user=self.settings['user'], host=self.settings['hostname'],
                port=self.settings['port'], password=self.settings['password'])
            else:
                # local with password
                self.log.debug("LOCAL WITH PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],
                user=self.settings['user'], password=self.settings['password'])
        else:
            if (checkValue('hostname',self.settings) and checkValue('port',self.settings)):
                # remote without password
                self.log.debug("REMOTE WITHOUT PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],user=self.settings['user'], host=self.settings['hostname'],port=self.settings['port'])

retval = "build_dsc"
        if not retval :
            command = "sbuild -A -n -s -d %s %s/%s_%s.dsc" % (chroot_name,
                srcdir, buildreq.get_package(), buildreq.get_version())
            ret = pybitclient.run_cmd (command, self.settings["dry_run"], logfile)
            if (ret == 3 or ret == 1):
                retval = "build-dep-wait"
            elif (ret):
                retval = "build_binary"
        if not retval :
            changes = "%s/%s_%s_%s.changes" % (self.settings["buildroot"], buildreq.get_package(),
                buildreq.get_version(), buildreq.get_arch())
            if not self.settings["dry_run"] and not os.path.isfile (changes) :
                logging.warn("E: build_master: Failed to find %s file." % (changes))
                retval = "build_changes"
            if not retval and checkValue ('debsignkey', self.settings) :
                command = "debsign -k%s %s" % (self.settings['debsignkey'], changes)
                if pybitclient.run_cmd (command, self.settings["dry_run"], logfile):
                    retval = "build_sign"
        return self._overall_success(retval, conn_data)

def connect(self):
        # for catbells
        if (checkValue('password',self.settings)):
            if (checkValue('hostname',self.settings) and checkValue('port',self.settings)):
                # remote with password
                self.log.debug("REMOTE WITH PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],
                user=self.settings['user'], host=self.settings['hostname'],
                port=self.settings['port'], password=self.settings['password'])
            else:
                # local with password
                self.log.debug("LOCAL WITH PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],
                user=self.settings['user'], password=self.settings['password'])
        else:
            if (checkValue('hostname',self.settings) and checkValue('port',self.settings)):
                # remote without password
                self.log.debug("REMOTE WITHOUT PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],user=self.settings['user'], host=self.settings['hostname'],port=self.settings['port'])
            else:
                # local without password
                self.log.debug("LOCAL WITHOUT PASSWORD")
                self.conn = psycopg2.connect(database=self.settings['databasename'],
                user=self.settings['user'])