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产生这个问题的原因是rqt_graph用到了pydot而pydot默认版本只支持pyparsing < 2.0版本。而现在系统中pyparsing的默认版本是大于2.0的。幸运的是新版的pydot已经解决了这个问题。所以解决方法很容易，就是升级pydot的版本。
sudo pip install -U pydot
