ROS Tutorials (4)

用Python写一个简单的service和client

运行时出现的错误：

can't read /var/mail/beginner_tutorials.srv
syntax error near unexpected token `(' ```
![Screenshot from 2016-12-05 17-43-53.png](http://upload-images.jianshu.io/upload_images/3869738-3db8996299100997.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
原因：没有识别是** python **的代码，** add_two_ints_server.py **中的*** #!/usr/bin/env python ***在文件的第一行，且没有空格。**import**前面没有缩进。
***
#### ROS Beginner Tutorials
#####Where next?
Given a robot that runs ROS,you could use this understanding to list topics published and subscribed by the robot, to identify the messages consumed by these topics and then write your own nodes that process sensor data act in the world.
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1. Launching a Simulator
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#####Remocons Overview：
Remocons are a family of applications built for the rocon(*Recon是目前最快的远程控制软件之一*) framework which present a convenient interface to the user for connecting to a ros system and choosing an application to run. More simply, what a remote control does for your cable tv （*有线电视*）, the remocons do for a ros system.
####Turtlebot-Developer Habitats
#####1. The Natural Habitat
The developer is at the PC running visualisation/monitoring software and connected wirelessly to the turtlebot. 
#####2.Interacting with your Turtlebot
This is not enough to run all possible nodes at once and even if it were possible, many of the programs would conflict. The basic principle then is to **bootstrap** the robot with the ros environment, core components and any software that assists in the launching/tearing down of any task related software that will run on top of the bootstrap level.