Remove duplicate rpc_config initialization (#168)

content/en/docs/user-guide/sdk/python.md

diff --git a/content/en/docs/user-guide/sdk/python.md b/content/en/docs/user-guide/sdk/python.md
index 7035370..8867e9c 100644
--- a/content/en/docs/user-guide/sdk/python.md
+++ b/content/en/docs/user-guide/sdk/python.md
@@ -35,7 +35,6 @@
 from ceresdb_client import Builder, RpcContext, PointBuilder, ValueBuilder, WriteRequest, SqlQueryRequest, Mode, RpcConfig
 
 rpc_config = RpcConfig()
-rpc_config = RpcConfig()
 rpc_config.thread_num = 1
 rpc_config.default_write_timeout_ms = 1000