Minor changes to remove code linting warnings

src/context/service/__main__.py

@@ -16,12 +16,12 @@ from context.service.rest_server.resources.Context import Context
 terminate = threading.Event()
 logger = None
 
-def signal_handler(signal, frame):
+def signal_handler(signal_, frame):
     logger.warning('Terminate signal received')
     terminate.set()
 
 def main():
-    global logger
+    global logger # pylint: disable=global-statement
 
     grpc_service_port    = get_setting('CONTEXTSERVICE_SERVICE_PORT_GRPC', default=GRPC_SERVICE_PORT   )
     max_workers          = get_setting('MAX_WORKERS',                      default=GRPC_MAX_WORKERS    )

src/context/service/grpc_server/ContextService.py

@@ -29,9 +29,9 @@ class ContextService:
         self.server = None
 
     def start(self):
-        self.endpoint = '{}:{}'.format(self.address, self.port)
-        LOGGER.debug('Starting Service (tentative endpoint: {}, max_workers: {})...'.format(
-            self.endpoint, self.max_workers))
+        self.endpoint = '{:s}:{:s}'.format(self.address, self.port)
+        LOGGER.debug('Starting Service (tentative endpoint: {:s}, max_workers: {:s})...'.format(
+            str(self.endpoint), str(self.max_workers)))
 
         self.pool = futures.ThreadPoolExecutor(max_workers=self.max_workers)
         self.server = grpc.server(self.pool) # , interceptors=(tracer_interceptor,))
@@ -44,15 +44,15 @@ class ContextService:
         add_HealthServicer_to_server(self.health_servicer, self.server)
 
         port = self.server.add_insecure_port(self.endpoint)
-        self.endpoint = '{}:{}'.format(self.address, port)
-        LOGGER.info('Listening on {}...'.format(self.endpoint))
+        self.endpoint = '{:s}:{:s}'.format(str(self.address), str(port))
+        LOGGER.info('Listening on {:s}...'.format(str(self.endpoint)))
         self.server.start()
         self.health_servicer.set(OVERALL_HEALTH, HealthCheckResponse.SERVING) # pylint: disable=maybe-no-member
 
         LOGGER.debug('Service started')
 
     def stop(self):
-        LOGGER.debug('Stopping service (grace period {} seconds)...'.format(self.grace_period))
+        LOGGER.debug('Stopping service (grace period {:s} seconds)...'.format(str(self.grace_period)))
         self.health_servicer.enter_graceful_shutdown()
         self.server.stop(self.grace_period)
         LOGGER.debug('Service stopped')