Fix formatting

examples/python/data_transmission/client.py

@@ -26,6 +26,7 @@ CLIENT_ID = 1
 # Note that this example was contributed by an external user using Chinese comments.
 # In all cases, the Chinese comment text is translated to English just below it.
 
+
 # 一元模式(在一次调用中, 客户端只能向服务器传输一次请求数据, 服务器也只能返回一次响应)
 # unary-unary(In a single call, the client can only send request once, and the server can
 # only respond once.)