code: def _update_explicit_bucket_count(a_float, dist):
      
      buckets = dist.explicitBuckets
      if buckets is None:
          raise ValueError(_BAD_UNSET_BUCKETS % (u'explicit buckets'))
      bucket_counts = dist.bucketCounts
      bounds = buckets.bounds
      if len(bucket_counts) < len(bounds) + 1:
          raise ValueError(_BAD_LOW_BUCKET_COUNT)
      bucket_counts[bisect.bisect(bounds, a_float)] += 1
docs: Adds `a_float` to `dist`, updating its explicit buckets.
  
      Args:
        a_float (float): a new value
        dist (:class:`endpoints_management.gen.servicecontrol_v1_messages.Distribution`):
          the Distribution being updated
  
      Raises:
        ValueError: if `dist` does not already have explict buckets defined
        ValueError: if there are not enough bucket count fields in `dist`