else:
RESTCONF_VERSION = 'rfc8040'
-RESTCONF_BASE_URL = 'http://localhost:' + RESTCONF_PORT + RESTCONF_PATH_PREFIX[RESTCONF_VERSION]
+RESTCONF_BASE_URL = 'http://localhost:' + str(RESTCONF_PORT) + RESTCONF_PATH_PREFIX[RESTCONF_VERSION]
if 'USE_ODL_ALT_KARAF_INSTALL_DIR' in os.environ:
KARAF_INSTALLDIR = os.environ['USE_ODL_ALT_KARAF_INSTALL_DIR']