code: def find_bucket(self, bucketing_id, parent_id, traffic_allocations):
      
  
      bucketing_key = BUCKETING_ID_TEMPLATE.format(bucketing_id=bucketing_id, parent_id=parent_id)
      bucketing_number = self._generate_bucket_value(bucketing_key)
      self.config.logger.debug('Assigned bucket %s to user with bucketing ID "%s".' % (
        bucketing_number,
        bucketing_id
      ))
  
      for traffic_allocation in traffic_allocations:
        current_end_of_range = traffic_allocation.get('endOfRange')
        if bucketing_number < current_end_of_range:
          return traffic_allocation.get('entityId')
  
      return None
docs: Determine entity based on bucket value and traffic allocations.
  
      Args:
        bucketing_id: ID to be used for bucketing the user.
        parent_id: ID representing group or experiment.
        traffic_allocations: Traffic allocations representing traffic allotted to experiments or variations.
  
      Returns:
        Entity ID which may represent experiment or variation.