1. Section [Link](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/storage/azure-storage-blob/samples/blob_samples_batch_delete_blobs.py#L25):  Reason: NameError: name 'ResourceExistsError' is not defined. Suggestion: Add: `from azure.core.exceptions import ResourceExistsError` @jongio for notification.
