The fully-qualified URIs that point to your data in Google Cloud Storage.

        Each URI can contain one '*' wildcard character and it must come after the 'bucket' name.

def source_uris(self):
        """The fully-qualified URIs that point to your data in Google Cloud Storage.

        Each URI can contain one '*' wildcard character and it must come after the 'bucket' name."""
        return [x.path for x in luigi.task.flatten(self.input())]