getParamCached in rospy?

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is there a version of getParamCached() in rospy?

In roscpp: "ros::NodeHandle::getParamCached() and ros::param::getCached() provide local caching of parameter data. Using these versions informs the Parameter Server that this node would like to be notified when the parameter is changed, and prevents the node from having to re-lookup the value with the parameter server on subsequent calls."

If not, what would it take to implement it?

I am calling rospy.get_param() in a tight loop. I get some exceptions from httplib (CannotSendRequest and ResponseNotReady). Is it because I am calling get_param() too often? What over exceptions should I look for?