read_lib_size.py

"""Demonstrates how to retrieve the storage size of a SharePoint document library

Official documentation: https://learn.microsoft.com/en-us/sharepoint/dev/apis/rest-api/navigation/list-operations
"""

from office365.sharepoint.client_context import ClientContext
from tests.settings import cert_path, cert_thumbprint, client_id, site_url, tenant

ctx = ClientContext(site_url).with_client_certificate(
    tenant, client_id=client_id, thumbprint=cert_thumbprint, cert_path=cert_path
)
lib = ctx.web.lists.get_by_title("Documents").root_folder.expand(["StorageMetrics"]).get().execute_query()
print(f"List size (in bytes): {lib.storage_metrics.total_size}")