code: def _get_prefix_from_bucket_config(self, config):
      prefix = furl.furl(
          scheme="gs", netloc=config.bucket, path=config.subdir
      )
      return str(prefix)
  
imports: import abc
  import warnings
  from copy import copy
  from operator import itemgetter
  from os import getenv
  import furl
  import six
  from attr import attrib, attrs
label_desc: Use image node_id 7 for calling the GSBucketConfigurations obj's underlying member method code with example usage: obj._get_prefix_from_bucket_config(config) and returns: str