How to use the datapackage.helpers.get_descriptor_base_path function in datapackage

# Handle deprecated default_base_path argument
        if default_base_path is not None:
            warnings.warn(
                'Argument "default_base_path" is deprecated. '
                'Please use "base_path" argument.',
                UserWarning)
            base_path = default_base_path

        # Extract from zip
        tempdir, descriptor = _extract_zip_if_possible(descriptor)
        if tempdir:
            self.__tempdir = tempdir

        # Get base path
        if base_path is None:
            base_path = helpers.get_descriptor_base_path(descriptor)

        # Instantiate storage
        if storage and not isinstance(storage, Storage):
            storage = Storage.connect(storage, **options)

        # Get descriptor from storage
        if storage and not descriptor:
            descriptor = {'resources': []}
            for bucket in storage.buckets:
                descriptor['resources'].append({'path': bucket})

        # Process descriptor
        descriptor = helpers.retrieve_descriptor(descriptor)
        descriptor = helpers.dereference_package_descriptor(descriptor, base_path)

        # Handle deprecated resource.path/url

def __init__(self, descriptor=None, schema=None, default_base_path=None):

        # Extract from zip
        descriptor = self._extract_zip_if_possible(descriptor)

        # Get base path
        self._base_path = helpers.get_descriptor_base_path(descriptor) or default_base_path

        # Process actions
        self._descriptor = helpers.retrieve_descriptor(descriptor)
        helpers.dereference_data_package_descriptor(self._descriptor, self._base_path)
        helpers.expand_data_package_descriptor(self._descriptor)

        # Get profile
        profile = self._descriptor['profile']

        # Handle deprecated schema argument
        if schema is not None:
            warnings.warn(
                'Argument "schema" is deprecated. '
                'Please use "descriptor.profile" property.',
                UserWarning)
            if isinstance(schema, six.string_types):

def __init__(self, descriptor={}, base_path=None, strict=False, storage=None,
                 # Internal
                 package=None, **options):

        # Get base path
        if base_path is None:
            base_path = helpers.get_descriptor_base_path(descriptor)

        # Instantiate storage
        if storage and not isinstance(storage, Storage):
            storage = Storage.connect(storage, **options)

        # Process descriptor
        descriptor = helpers.retrieve_descriptor(descriptor)
        descriptor = helpers.dereference_resource_descriptor(descriptor, base_path)

        # Handle deprecated resource.path.url
        if descriptor.get('url'):
            warnings.warn(
                'Resource property "url: " is deprecated. '
                'Please use "path: " instead.',
                UserWarning)
            descriptor['path'] = descriptor['url']