在ros中使用opencv启动例程 rosrun robot_vision cv_bridge_test.py 遇到的问题

在运行这个例程的时候终端中出现：

[rosrun] Couldn't find executable named cv_bridge_test.py below /home/wyw/catkin_ws/src/robot_vision

[rosrun] Found the following, but they're either not files,

[rosrun] or not executable:

[rosrun]   /home/wyw/catkin_ws/src/robot_vision/scripts/cv_bridge_test.py

而当我们去找这个文件的时候却能够找到文件，其实是文件的访问权限出了问题，找到文件的所在目录，打开终端，输入命令：

chmod +x cv_bridge_test.py

问题解决

但是我在使用的时候终端报出几个错误：

第一：

File "/home/wyw/catkin_ws/src/robot_vision/scripts/cv_bridge_test.py", line 21

    print e

          ^

SyntaxError: Missing parentheses in call to 'print'. Did you mean print(e)?

这时我们将cv_bridge_test.py文件打开，将其中的print e 改成print (e)

注：（）为英文的

第二

：<pre> File "/home/wyw/catkin_ws/src/robot_vision/scripts/cv_bridge_test.py", line 46

    print "Shutting down cv_bridge_test node."

          ^

SyntaxError: Missing parentheses in call to 'print'. Did you mean print("Shutting down cv_bridge_test node.")?

</pre>

将cv_bridge_test.py文件打开，将其中的46行改为：    

 print ("Shutting down cv_bridge_test node.")

至此问题解决。