langchain/document_loaders/azure_blob_storage_container.py/AzureBlobStorageContainerLoader/__init__
class AzureBlobStorageContainerLoader:    def __init__(self, conn_str: str, container: str, prefix: str = ""):
        """Initialize with connection string, container and blob prefix."""
        self.conn_str = conn_str
        self.container = container
        self.prefix = prefix