code: def list_subscriptions_by_topic(TopicArn, region=None, key=None, keyid=None, profile=None):
      '''
      Returns a list of the subscriptions to a specific topic
  
      CLI example::
  
          salt myminion boto3_sns.list_subscriptions_by_topic mytopic region=us-east-1
      '''
      conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
      NextToken = ''
      res = []
      try:
          while NextToken is not None:
              ret = conn.list_subscriptions_by_topic(TopicArn=TopicArn, NextToken=NextToken)
              NextToken = ret.get('NextToken', None)
              subs = ret.get('Subscriptions', [])
              res += subs
      except botocore.exceptions.ClientError as e:
          log.error('Failed to list subscriptions for SNS topic %s: %s', TopicArn, e)
          return None
      return ref list_subscriptions_by_topic(TopicArn, region=None, key=None, keyid=None, profile=None):
      '''
      Returns a list of the subscriptions to a specific topic
  
      CLI example::
  
          salt myminion boto3_sns.list_subscriptions_by_topic mytopic region=us-east-1
      '''
      conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
      NextToken = ''
      res = []
      try:
          while NextToken is not None:
              ret = conn.list_subscriptions_by_topic(TopicArn=TopicArn, NextToken=NextToken)
              NextToken = ret.get('NextToken', None)
              subs = ret.get('Subscriptions', [])
              res += subs
      except botocore.exceptions.ClientError as e:
          log.error('Failed to list subscriptions for SNS topic %s: %s', TopicArn, e)
          return None
      return res
docs: Returns a list of the subscriptions to a specific topic
  
      CLI example::
  
          salt myminion boto3_sns.list_subscriptions_by_topic mytopic region=us-east-1