diff --git a/vnpy/rpc/test_client.py b/examples/simple_rpc/test_client.py
similarity index 74%
rename from vnpy/rpc/test_client.py
rename to examples/simple_rpc/test_client.py
index 7a693a52..57dd0909 100644
--- a/vnpy/rpc/test_client.py
+++ b/examples/simple_rpc/test_client.py
@@ -20,15 +20,15 @@ class TestClient(RpcClient):
         """
         Realize callable function
         """
-        print('client received topic:', topic, ', data:', data)
+        print(f"client received topic:{topic}, data:{data}")
 
 
-if __name__ == '__main__':
-    req_address = 'tcp://localhost:2014'
-    sub_address = 'tcp://localhost:0602'
+if __name__ == "__main__":
+    req_address = "tcp://localhost:2014"
+    sub_address = "tcp://localhost:0602"
 
     tc = TestClient(req_address, sub_address)
-    tc.subscribeTopic('')
+    tc.subscribe_topic("")
     tc.start()
 
     while 1:
diff --git a/vnpy/rpc/test_server.py b/examples/simple_rpc/test_server.py
similarity index 72%
rename from vnpy/rpc/test_server.py
rename to examples/simple_rpc/test_server.py
index 660168fc..3589bead 100644
--- a/vnpy/rpc/test_server.py
+++ b/examples/simple_rpc/test_server.py
@@ -22,19 +22,19 @@ class TestServer(RpcServer):
         """
         Test function
         """
-        print('receiving: %s, %s' % (a, b))
+        print(f"receiving:{a} {b}")
         return a + b
 
 
-if __name__ == '__main__':
-    rep_address = 'tcp://*:2014'
-    pub_address = 'tcp://*:0602'
+if __name__ == "__main__":
+    rep_address = "tcp://*:2014"
+    pub_address = "tcp://*:0602"
 
     ts = TestServer(rep_address, pub_address)
     ts.start()
 
     while 1:
-        content = 'current server time is %s' % time()
+        content = f"current server time is {time()}"
         print(content)
-        ts.publish('test', content)
+        ts.publish("test", content)
         sleep(2)