(listener, topicName)
return _topicMgr.getTopic(topicName).hasListener(listener)
Returns true if listener has subscribed to topicName, false otherwise.
    WARNING: a false return is not a guarantee that listener won't get
    messages of topicName: it could receive messages of a subtopic of
    topicName.
Returns true if listener has subscribed to topicName, false otherwise.
    WARNING: a false return is not a guarantee that listener won't get
    messages of topicName: it could receive messages of a subtopic of
    topicName.
Returns true if listener has subscribed to topicName false otherwise . WARNING : a false return is not a guarantee that listener won t get messages of topicName : it could receive messages of a subtopic of topicName .
def isSubscribed(listener, topicName) -> bool:
    """
    Returns true if listener has subscribed to topicName, false otherwise.
    WARNING: a false return is not a guarantee that listener won't get
    messages of topicName: it could receive messages of a subtopic of
    topicName.
    """
    return _topicMgr.getTopic(topicName).hasListener(listener)
def isSubscribed ( listener , topicName ) -> bool : return _topicMgr . getTopic ( topicName ) . hasListener ( listener )