用ros publisher发布cmd_vel命令(python)

参考ros wiki的连接https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwja9rnUjPPPAhXGI5QKHZgxDnsQFggcMAA&url=http%3A%2F%2Fwiki.ros.org%2FROS%2FTutorials%2FWritingPublisherSubscriber(c
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