def clear(self):
        with self.lock:
            self.counter = 0
Return a string representation of this rule.  It has the form::
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pyformance-0.3.2/pyformance/meters/counter.py/Counter.clear--crossover with--dataset/ETHPy150Open nltk/nltk/nltk/chunk/regexp.py/ExpandLeftRule.__repr__