code: def list(self, prefix='', delimiter='', marker='', headers=None):
          
          return BucketListResultSet(self, prefix, delimiter, marker, headers)
docs: List key objects within a bucket.  This returns an instance of an
          BucketListResultSet that automatically handles all of the result
          paging, etc. from S3.  You just need to keep iterating until
          there are no more results.
          
          Called with no arguments, this will return an iterator object across
          all keys within the bucket.
  
          The Key objects returned by the iterator are obtained by parsing
          the results of a GET on the bucket, also known as the List Objects
          request.  The XML returned by this request contains only a subset
          of the information about each key.  Certain metadata fields such
          as Content-Type and user metadata are not available in the XML.
          Therefore, if you want these additional metadata fields you will
          have to do a HEAD request on the Key in the bucket.
          
          :type prefix: string
          :param prefix: allows you to limit the listing to a particular
                          prefix.  For example, if you call the method with
                          prefix='/foo/' then the iterator will only cycle
                          through the keys that begin with the string '/foo/'.
                          
          :type delimiter: string
          :param delimiter: can be used in conjunction with the prefix
                          to allow you to organize and browse your keys
                          hierarchically. See:
                          http://docs.amazonwebservices.com/AmazonS3/2006-03-01/
                          for more details.
                          
          :type marker: string
          :param marker: The "marker" of where you are in the result set
          
          :rtype: :class:`boto.s3.bucketlistresultset.BucketListResultSet`
          :return: an instance of a BucketListResultSet that handles paging, etc