def __call__(self, context):
    """Execute operation.

    Args:
      context: mapreduce context as context.Context.
    """
    context._counters.increment(self.counter_name, self.delta)
def __call__ ( self , context ) : context . _counters . increment ( self . counter_name , self . delta )
Execute operation.

    Args:
      context: mapreduce context as context.Context.