diff --git a/python/examples/ocr/det_web_server.py b/python/examples/ocr/det_web_server.py
index 14be74130dcb413c31a3e76c150d74f65575f451..38c6541c70e9871d13dd81751d4edb2bc771a904 100644
--- a/python/examples/ocr/det_web_server.py
+++ b/python/examples/ocr/det_web_server.py
@@ -70,7 +70,8 @@ ocr_service = OCRService(name="ocr")
 ocr_service.load_model_config("ocr_det_model")
 if sys.argv[1] == 'gpu':
     ocr_service.set_gpus("0")
-    ocr_service.prepare_server(workdir="workdir", port=9292, device="gpu", gpuid=0)
+    ocr_service.prepare_server(
+        workdir="workdir", port=9292, device="gpu", gpuid=0)
 elif sys.argv[1] == 'cpu':
     ocr_service.prepare_server(workdir="workdir", port=9292, device="cpu")
 ocr_service.init_det()
diff --git a/python/examples/ocr/ocr_web_server.py b/python/examples/ocr/ocr_web_server.py
index 6c0de44661958a6425f57039261969551ff552c5..de83ca94a4c1f55d886175d9a87b6a34db34c2a5 100644
--- a/python/examples/ocr/ocr_web_server.py
+++ b/python/examples/ocr/ocr_web_server.py
@@ -95,7 +95,8 @@ ocr_service = OCRService(name="ocr")
 ocr_service.load_model_config("ocr_rec_model")
 if sys.argv[1] == 'gpu':
     ocr_service.set_gpus("0")
-    ocr_service.prepare_server(workdir="workdir", port=9292, device="gpu", gpuid=0)
+    ocr_service.prepare_server(
+        workdir="workdir", port=9292, device="gpu", gpuid=0)
 elif sys.argv[1] == 'cpu':
     ocr_service.prepare_server(workdir="workdir", port=9292)
 ocr_service.init_det_client(
diff --git a/python/examples/ocr/rec_web_server.py b/python/examples/ocr/rec_web_server.py
index 0f4e9f6d264ed602f387bfaf0303cd59af7823fa..aae97fd9e3fbd1d29b6cf2ef160b92a522db2e22 100644
--- a/python/examples/ocr/rec_web_server.py
+++ b/python/examples/ocr/rec_web_server.py
@@ -70,7 +70,8 @@ ocr_service.load_model_config("ocr_rec_model")
 ocr_service.init_rec()
 if sys.argv[1] == 'gpu':
     ocr_service.set_gpus("0")
-    ocr_service.prepare_server(workdir="workdir", port=9292, device="gpu", gpuid=0)
+    ocr_service.prepare_server(
+        workdir="workdir", port=9292, device="gpu", gpuid=0)
 elif sys.argv[1] == 'cpu':
     ocr_service.prepare_server(workdir="workdir", port=9292, device="cpu")
 ocr_service.run_rpc_service()