Cyber: Add listener_py3 example.

cyber/python/examples/listener.py

@@ -29,20 +29,19 @@ def callback(data):
     """
     Reader message callback.
     """
-    print "=" * 80
-    print "py:reader callback msg->:"
-    print data
-    print "=" * 80
+    print("=" * 80)
+    print("py:reader callback msg->:")
+    print(data)
+    print("=" * 80)
 
 
 def test_listener_class():
     """
     Reader message.
     """
-    print "=" * 120
+    print("=" * 120)
     test_node = cyber.Node("listener")
-    test_node.create_reader("channel/chatter",
-                            ChatterBenchmark, callback)
+    test_node.create_reader("channel/chatter", ChatterBenchmark, callback)
     test_node.spin()
 
 if __name__ == '__main__':

cyber/python/examples/listener_py3.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+
+# ****************************************************************************
+# Copyright 2019 The Apollo Authors. All Rights Reserved.
+#
+# 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.
+# ****************************************************************************
+# -*- coding: utf-8 -*-
+"""Module for example of listener."""
+
+import sys
+
+sys.path.append("../")
+from cyber_py import cyber_py3 as cyber
+from cyber.proto.unit_test_pb2 import ChatterBenchmark
+
+
+def callback(data):
+    """
+    Reader message callback.
+    """
+    print("=" * 80)
+    print("py:reader callback msg->:")
+    print(data)
+    print("=" * 80)
+
+
+def test_listener_class():
+    """
+    Reader message.
+    """
+    print("=" * 120)
+    test_node = cyber.Node("listener")
+    test_node.create_reader("channel/chatter", ChatterBenchmark, callback)
+    test_node.spin()
+
+if __name__ == '__main__':
+    cyber.init()
+    test_listener_class()
+    cyber.shutdown()