Thanks @Hubert Dudek​ !

Actually I want to delete the folder. But when I try to do that, I get this error: shaded.databricks.org.apache.hadoop.fs.azure.AzureException: hadoop_azure_shaded.com.microsoft.azure.storage.StorageException: This operation is not permitted on a non-empty directory.

That's why I switched to mv.

As its single threaded, would you advise to use the threading library of python and delete each delta table in one thread? Will that be a good idea, or could it have unintended consequences?