diff --git a/examples/python/data_transmission/README.cn.md b/examples/python/data_transmission/README.cn.md
new file mode 100644
index 00000000000..812a8bbb7d6
--- /dev/null
+++ b/examples/python/data_transmission/README.cn.md
@@ -0,0 +1,36 @@
+## Data transmission demo for using gRPC in Python
+
+在Python中使用gRPC时, 进行数据传输的四种方式  [官方指南](<https://grpc.io/docs/guides/concepts/#unary-rpc>)
+
+- #### 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
+
+  `client.py - line:14 - simple_method`
+
+  `server.py - line:17 - SimpleMethod`
+
+- #### 客户端流模式
+
+  在一次调用中, 客户端可以多次向服务器传输数据, 但是服务器只能返回一次响应
+
+  `clien.py - line:27 - client_streaming_method `
+
+  `server.py - line:28 - ClientStreamingMethod`
+
+- #### 服务端流模式 
+
+  在一次调用中, 客户端只能向服务器传输一次请求数据, 但是服务器可以多次返回响应
+
+  `clien.py - line:48 - server_streaming_method`
+
+  `server.py - line:41 - ServerStreamingMethod`
+
+- #### 双向流模式
+
+  在一次调用中, 客户端和服务器都可以向对方多次收发数据
+
+  `client.py - line:63 - bidirectional_streaming_method`
+
+  `server.py - line:59 - BidirectionalStreamingMethod`
+
diff --git a/examples/python/data_transmission/README.en.md b/examples/python/data_transmission/README.en.md
new file mode 100644
index 00000000000..659ee1b93fb
--- /dev/null
+++ b/examples/python/data_transmission/README.en.md
@@ -0,0 +1,37 @@
+##  Data transmission demo for using gRPC in Python
+
+Four ways of data transmission when gRPC is used in Python.  [Offical Guide](<https://grpc.io/docs/guides/concepts/#unary-rpc>)
+
+- #### unary-unary
+
+  In a single call, the client can only send request once, and the server can only respond once.
+
+  `client.py - line:14 - simple_method`
+
+  `server.py - line:17 - SimpleMethod`
+
+- #### stream-unary
+
+  In a single call, the client can transfer data to the server an arbitrary number of times, but the server can only return a response once.
+
+  `clien.py - line:27 - client_streaming_method`
+
+  `server.py - line:28 - ClientStreamingMethod`
+
+- #### unary-stream
+
+  In a single call, the client can only transmit data to the server at one time, but the server can return the response many times.
+
+  `clien.py - line:48 - server_streaming_method`
+
+  `server.py - line:41 - ServerStreamingMethod`
+
+- #### stream-stream
+
+  In a single call, both client and server can send and receive data 
+  to each other multiple times.
+
+  `client.py - line:63 - bidirectional_streaming_method`
+
+  `server.py - line:59 - BidirectionalStreamingMethod`
+
diff --git a/examples/python/data_transmission/client.py b/examples/python/data_transmission/client.py
new file mode 100644
index 00000000000..dee25b3a2ab
--- /dev/null
+++ b/examples/python/data_transmission/client.py
@@ -0,0 +1,114 @@
+# Copyright 2019 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""The example of four ways of data transmission using gRPC in Python."""
+
+import time
+import grpc
+
+import demo_pb2_grpc
+import demo_pb2
+
+SERVER_ADDRESS = "localhost:23333"
+CLIENT_ID = 1
+
+
+# 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.)
+def simple_method(stub):
+    print("--------------Call SimpleMethod Begin--------------")
+    request = demo_pb2.Request(
+        client_id=CLIENT_ID, request_data="called by Python client")
+    response = stub.SimpleMethod(request)
+    print("resp from server(%d), the message=%s" % (response.server_id,
+                                                    response.response_data))
+    print("--------------Call SimpleMethod Over---------------")
+
+
+# 客户端流模式（在一次调用中, 客户端可以多次向服务器传输数据, 但是服务器只能返回一次响应）
+# stream-unary (In a single call, the client can transfer data to the server several times,
+# but the server can only return a response once.)
+def client_streaming_method(stub):
+    print("--------------Call ClientStreamingMethod Begin--------------")
+
+    # 创建一个生成器
+    # create a generator
+    def request_messages():
+        for i in range(5):
+            request = demo_pb2.Request(
+                client_id=CLIENT_ID,
+                request_data=("called by Python client, message:%d" % i))
+            yield request
+
+    response = stub.ClientStreamingMethod(request_messages())
+    print("resp from server(%d), the message=%s" % (response.server_id,
+                                                    response.response_data))
+    print("--------------Call ClientStreamingMethod Over---------------")
+
+
+# 服务端流模式（在一次调用中, 客户端只能一次向服务器传输数据, 但是服务器可以多次返回响应）
+# unary-stream (In a single call, the client can only transmit data to the server at one time,
+# but the server can return the response many times.)
+def server_streaming_method(stub):
+    print("--------------Call ServerStreamingMethod Begin--------------")
+    request = demo_pb2.Request(
+        client_id=CLIENT_ID, request_data="called by Python client")
+    response_iterator = stub.ServerStreamingMethod(request)
+    for response in response_iterator:
+        print("recv from server(%d), message=%s" % (response.server_id,
+                                                    response.response_data))
+
+    print("--------------Call ServerStreamingMethod Over---------------")
+
+
+# 双向流模式 (在一次调用中, 客户端和服务器都可以向对方多次收发数据)
+# stream-stream (In a single call, both client and server can send and receive data
+# to each other multiple times.)
+def bidirectional_streaming_method(stub):
+    print(
+        "--------------Call BidirectionalStreamingMethod Begin---------------")
+
+    # 创建一个生成器
+    # create a generator
+    def request_messages():
+        for i in range(5):
+            request = demo_pb2.Request(
+                client_id=CLIENT_ID,
+                request_data=("called by Python client, message: %d" % i))
+            yield request
+            time.sleep(1)
+
+    response_iterator = stub.BidirectionalStreamingMethod(request_messages())
+    for response in response_iterator:
+        print("recv from server(%d), message=%s" % (response.server_id,
+                                                    response.response_data))
+
+    print("--------------Call BidirectionalStreamingMethod Over---------------")
+
+
+def main():
+    with grpc.insecure_channel(SERVER_ADDRESS) as channel:
+        stub = demo_pb2_grpc.GRPCDemoStub(channel)
+
+        simple_method(stub)
+
+        client_streaming_method(stub)
+
+        server_streaming_method(stub)
+
+        bidirectional_streaming_method(stub)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/examples/python/data_transmission/demo.proto b/examples/python/data_transmission/demo.proto
new file mode 100644
index 00000000000..b2d956c89d5
--- /dev/null
+++ b/examples/python/data_transmission/demo.proto
@@ -0,0 +1,69 @@
+// Copyright 2019 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// 语法版本声明，必须放在非注释的第一行
+// Syntax version declaration. Must be placed on the first line of non-commentary.
+
+syntax = "proto3";
+// The document of proto3: https://developers.google.com/protocol-buffers/docs/proto3
+
+// 包名定义, Python中使用时可以省略不写
+// Package name definition, which can be omitted in Python.
+package demo;
+
+/*
+`message`是用来定义传输的数据的格式的, 等号后面的是字段编号
+消息定义中的每个字段都有唯一的编号
+总体格式类似于Python中定义一个类或者Golang中定义一个结构体
+*/
+/*
+`message` is used to define the structure of the data to be transmitted, after the equal sign
+is the field number. Each field in the message definition has a unique number.
+The overall format is similar to defining a class in Python or a structure in Golang.
+*/
+message Request {
+    int64 client_id = 1;
+    string request_data = 2;
+}
+
+message Response {
+    int64 server_id = 1;
+    string response_data = 2;
+}
+
+// `service` 是用来给gRPC服务定义方法的, 格式固定, 类似于Golang中定义一个接口
+// `service` is used to define methods for gRPC services in a fixed format, similar to defining
+//an interface in Golang
+service GRPCDemo {
+    // 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.)
+    rpc SimpleMethod (Request) returns (Response);
+
+    // 客户端流模式（在一次调用中, 客户端可以多次向服务器传输数据, 但是服务器只能返回一次响应）
+    // stream-unary (In a single call, the client can transfer data to the server several times,
+    // but the server can only return a response once.)
+    rpc ClientStreamingMethod (stream Request) returns (Response);
+
+    // 服务端流模式（在一次调用中, 客户端只能一次向服务器传输数据, 但是服务器可以多次返回响应）
+    // unary-stream (In a single call, the client can only transmit data to the server at one time,
+    // but the server can return the response many times.)
+    rpc ServerStreamingMethod (Request) returns (stream Response);
+
+    // 双向流模式 (在一次调用中, 客户端和服务器都可以向对方多次收发数据)
+    // stream-stream (In a single call, both client and server can send and receive data
+    // to each other multiple times.)
+    rpc BidirectionalStreamingMethod (stream Request) returns (stream Response);
+}
+
diff --git a/examples/python/data_transmission/demo_pb2.py b/examples/python/data_transmission/demo_pb2.py
new file mode 100644
index 00000000000..5dfaf837dfd
--- /dev/null
+++ b/examples/python/data_transmission/demo_pb2.py
@@ -0,0 +1,174 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: demo.proto
+
+import sys
+_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor.FileDescriptor(
+  name='demo.proto',
+  package='demo',
+  syntax='proto3',
+  serialized_options=None,
+  serialized_pb=_b('\n\ndemo.proto\x12\x04\x64\x65mo\"2\n\x07Request\x12\x11\n\tclient_id\x18\x01 \x01(\x03\x12\x14\n\x0crequest_data\x18\x02 \x01(\t\"4\n\x08Response\x12\x11\n\tserver_id\x18\x01 \x01(\x03\x12\x15\n\rresponse_data\x18\x02 \x01(\t2\xf0\x01\n\x08GRPCDemo\x12-\n\x0cSimpleMethod\x12\r.demo.Request\x1a\x0e.demo.Response\x12\x38\n\x15\x43lientStreamingMethod\x12\r.demo.Request\x1a\x0e.demo.Response(\x01\x12\x38\n\x15ServerStreamingMethod\x12\r.demo.Request\x1a\x0e.demo.Response0\x01\x12\x41\n\x1c\x42idirectionalStreamingMethod\x12\r.demo.Request\x1a\x0e.demo.Response(\x01\x30\x01\x62\x06proto3')
+)
+
+
+
+
+_REQUEST = _descriptor.Descriptor(
+  name='Request',
+  full_name='demo.Request',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='client_id', full_name='demo.Request.client_id', index=0,
+      number=1, type=3, cpp_type=2, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='request_data', full_name='demo.Request.request_data', index=1,
+      number=2, type=9, cpp_type=9, label=1,
+      has_default_value=False, default_value=_b("").decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  serialized_options=None,
+  is_extendable=False,
+  syntax='proto3',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=20,
+  serialized_end=70,
+)
+
+
+_RESPONSE = _descriptor.Descriptor(
+  name='Response',
+  full_name='demo.Response',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='server_id', full_name='demo.Response.server_id', index=0,
+      number=1, type=3, cpp_type=2, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='response_data', full_name='demo.Response.response_data', index=1,
+      number=2, type=9, cpp_type=9, label=1,
+      has_default_value=False, default_value=_b("").decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  serialized_options=None,
+  is_extendable=False,
+  syntax='proto3',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=72,
+  serialized_end=124,
+)
+
+DESCRIPTOR.message_types_by_name['Request'] = _REQUEST
+DESCRIPTOR.message_types_by_name['Response'] = _RESPONSE
+_sym_db.RegisterFileDescriptor(DESCRIPTOR)
+
+Request = _reflection.GeneratedProtocolMessageType('Request', (_message.Message,), {
+  'DESCRIPTOR' : _REQUEST,
+  '__module__' : 'demo_pb2'
+  # @@protoc_insertion_point(class_scope:demo.Request)
+  })
+_sym_db.RegisterMessage(Request)
+
+Response = _reflection.GeneratedProtocolMessageType('Response', (_message.Message,), {
+  'DESCRIPTOR' : _RESPONSE,
+  '__module__' : 'demo_pb2'
+  # @@protoc_insertion_point(class_scope:demo.Response)
+  })
+_sym_db.RegisterMessage(Response)
+
+
+
+_GRPCDEMO = _descriptor.ServiceDescriptor(
+  name='GRPCDemo',
+  full_name='demo.GRPCDemo',
+  file=DESCRIPTOR,
+  index=0,
+  serialized_options=None,
+  serialized_start=127,
+  serialized_end=367,
+  methods=[
+  _descriptor.MethodDescriptor(
+    name='SimpleMethod',
+    full_name='demo.GRPCDemo.SimpleMethod',
+    index=0,
+    containing_service=None,
+    input_type=_REQUEST,
+    output_type=_RESPONSE,
+    serialized_options=None,
+  ),
+  _descriptor.MethodDescriptor(
+    name='ClientStreamingMethod',
+    full_name='demo.GRPCDemo.ClientStreamingMethod',
+    index=1,
+    containing_service=None,
+    input_type=_REQUEST,
+    output_type=_RESPONSE,
+    serialized_options=None,
+  ),
+  _descriptor.MethodDescriptor(
+    name='ServerStreamingMethod',
+    full_name='demo.GRPCDemo.ServerStreamingMethod',
+    index=2,
+    containing_service=None,
+    input_type=_REQUEST,
+    output_type=_RESPONSE,
+    serialized_options=None,
+  ),
+  _descriptor.MethodDescriptor(
+    name='BidirectionalStreamingMethod',
+    full_name='demo.GRPCDemo.BidirectionalStreamingMethod',
+    index=3,
+    containing_service=None,
+    input_type=_REQUEST,
+    output_type=_RESPONSE,
+    serialized_options=None,
+  ),
+])
+_sym_db.RegisterServiceDescriptor(_GRPCDEMO)
+
+DESCRIPTOR.services_by_name['GRPCDemo'] = _GRPCDEMO
+
+# @@protoc_insertion_point(module_scope)
diff --git a/examples/python/data_transmission/demo_pb2_grpc.py b/examples/python/data_transmission/demo_pb2_grpc.py
new file mode 100644
index 00000000000..b6d6fc72a13
--- /dev/null
+++ b/examples/python/data_transmission/demo_pb2_grpc.py
@@ -0,0 +1,106 @@
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+import grpc
+
+import demo_pb2 as demo__pb2
+
+
+class GRPCDemoStub(object):
+  """service是用来给GRPC服务定义方法的, 格式固定, 类似于Golang中定义一个接口
+  `service` is used to define methods for GRPC services in a fixed format, similar to defining an interface in Golang
+  """
+
+  def __init__(self, channel):
+    """Constructor.
+
+    Args:
+      channel: A grpc.Channel.
+    """
+    self.SimpleMethod = channel.unary_unary(
+        '/demo.GRPCDemo/SimpleMethod',
+        request_serializer=demo__pb2.Request.SerializeToString,
+        response_deserializer=demo__pb2.Response.FromString,
+        )
+    self.ClientStreamingMethod = channel.stream_unary(
+        '/demo.GRPCDemo/ClientStreamingMethod',
+        request_serializer=demo__pb2.Request.SerializeToString,
+        response_deserializer=demo__pb2.Response.FromString,
+        )
+    self.ServerStreamingMethod = channel.unary_stream(
+        '/demo.GRPCDemo/ServerStreamingMethod',
+        request_serializer=demo__pb2.Request.SerializeToString,
+        response_deserializer=demo__pb2.Response.FromString,
+        )
+    self.BidirectionalStreamingMethod = channel.stream_stream(
+        '/demo.GRPCDemo/BidirectionalStreamingMethod',
+        request_serializer=demo__pb2.Request.SerializeToString,
+        response_deserializer=demo__pb2.Response.FromString,
+        )
+
+
+class GRPCDemoServicer(object):
+  """service是用来给GRPC服务定义方法的, 格式固定, 类似于Golang中定义一个接口
+  `service` is used to define methods for GRPC services in a fixed format, similar to defining an interface in Golang
+  """
+
+  def SimpleMethod(self, request, context):
+    """简单模式
+    unary-unary
+    """
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+
+  def ClientStreamingMethod(self, request_iterator, context):
+    """客户端流模式（在一次调用中, 客户端可以多次向服务器传输数据, 但是服务器只能返回一次响应）
+    stream-unary (In a single call, the client can transfer data to the server several times,
+    but the server can only return a response once.)
+    """
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+
+  def ServerStreamingMethod(self, request, context):
+    """服务端流模式（在一次调用中, 客户端只能一次向服务器传输数据, 但是服务器可以多次返回响应）
+    unary-stream (In a single call, the client can only transmit data to the server at one time,
+    but the server can return the response many times.)
+    """
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+
+  def BidirectionalStreamingMethod(self, request_iterator, context):
+    """双向流模式 (在一次调用中, 客户端和服务器都可以向对方多次收发数据)
+    stream-stream (In a single call, both client and server can send and receive data
+    to each other multiple times.)
+    """
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+
+
+def add_GRPCDemoServicer_to_server(servicer, server):
+  rpc_method_handlers = {
+      'SimpleMethod': grpc.unary_unary_rpc_method_handler(
+          servicer.SimpleMethod,
+          request_deserializer=demo__pb2.Request.FromString,
+          response_serializer=demo__pb2.Response.SerializeToString,
+      ),
+      'ClientStreamingMethod': grpc.stream_unary_rpc_method_handler(
+          servicer.ClientStreamingMethod,
+          request_deserializer=demo__pb2.Request.FromString,
+          response_serializer=demo__pb2.Response.SerializeToString,
+      ),
+      'ServerStreamingMethod': grpc.unary_stream_rpc_method_handler(
+          servicer.ServerStreamingMethod,
+          request_deserializer=demo__pb2.Request.FromString,
+          response_serializer=demo__pb2.Response.SerializeToString,
+      ),
+      'BidirectionalStreamingMethod': grpc.stream_stream_rpc_method_handler(
+          servicer.BidirectionalStreamingMethod,
+          request_deserializer=demo__pb2.Request.FromString,
+          response_serializer=demo__pb2.Response.SerializeToString,
+      ),
+  }
+  generic_handler = grpc.method_handlers_generic_handler(
+      'demo.GRPCDemo', rpc_method_handlers)
+  server.add_generic_rpc_handlers((generic_handler,))
diff --git a/examples/python/data_transmission/server.py b/examples/python/data_transmission/server.py
new file mode 100644
index 00000000000..f550b9b7bd2
--- /dev/null
+++ b/examples/python/data_transmission/server.py
@@ -0,0 +1,114 @@
+# Copyright 2019 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""The example of four ways of data transmission using gRPC in Python."""
+
+from threading import Thread
+from concurrent import futures
+
+import grpc
+import demo_pb2_grpc
+import demo_pb2
+
+SERVER_ADDRESS = 'localhost:23333'
+SERVER_ID = 1
+
+
+class DemoServer(demo_pb2_grpc.GRPCDemoServicer):
+
+    # 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.)
+    def SimpleMethod(self, request, context):
+        print("SimpleMethod called by client(%d) the message: %s" %
+              (request.client_id, request.request_data))
+        response = demo_pb2.Response(
+            server_id=SERVER_ID,
+            response_data="Python server SimpleMethod Ok!!!!")
+        return response
+
+    # 客户端流模式（在一次调用中, 客户端可以多次向服务器传输数据, 但是服务器只能返回一次响应）
+    # stream-unary (In a single call, the client can transfer data to the server several times,
+    # but the server can only return a response once.)
+    def ClientStreamingMethod(self, request_iterator, context):
+        print("ClientStreamingMethod called by client...")
+        for request in request_iterator:
+            print("recv from client(%d), message= %s" % (request.client_id,
+                                                         request.request_data))
+        response = demo_pb2.Response(
+            server_id=SERVER_ID,
+            response_data="Python server ClientStreamingMethod ok")
+        return response
+
+    # 服务端流模式（在一次调用中, 客户端只能一次向服务器传输数据, 但是服务器可以多次返回响应）
+    # unary-stream (In a single call, the client can only transmit data to the server at one time,
+    # but the server can return the response many times.)
+    def ServerStreamingMethod(self, request, context):
+        print("ServerStreamingMethod called by client(%d), message= %s" %
+              (request.client_id, request.request_data))
+
+        # 创建一个生成器
+        # create a generator
+        def response_messages():
+            for i in range(5):
+                response = demo_pb2.Response(
+                    server_id=SERVER_ID,
+                    response_data=("send by Python server, message=%d" % i))
+                yield response
+
+        return response_messages()
+
+    # 双向流模式 (在一次调用中, 客户端和服务器都可以向对方多次收发数据)
+    # stream-stream (In a single call, both client and server can send and receive data
+    # to each other multiple times.)
+    def BidirectionalStreamingMethod(self, request_iterator, context):
+        print("BidirectionalStreamingMethod called by client...")
+
+        # 开启一个子线程去接收数据
+        # Open a sub thread to receive data
+        def parse_request():
+            for request in request_iterator:
+                print("recv from client(%d), message= %s" %
+                      (request.client_id, request.request_data))
+
+        t = Thread(target=parse_request)
+        t.start()
+
+        for i in range(5):
+            yield demo_pb2.Response(
+                server_id=SERVER_ID,
+                response_data=("send by Python server, message= %d" % i))
+
+        t.join()
+
+
+def main():
+    server = grpc.server(futures.ThreadPoolExecutor())
+
+    demo_pb2_grpc.add_GRPCDemoServicer_to_server(DemoServer(), server)
+
+    server.add_insecure_port(SERVER_ADDRESS)
+    print("------------------start Python GRPC server")
+    server.start()
+    server.wait_for_termination()
+
+    # If raise Error:
+    #   AttributeError: '_Server' object has no attribute 'wait_for_termination'
+    # You can use the following code instead:
+    # import time
+    # while 1:
+    #     time.sleep(10)
+
+
+if __name__ == '__main__':
+    main()