> Python code used by Excel runs on the Microsoft Cloud with enterprise-level security as a compliant Microsoft 365 connected experience, just like OneDrive. The Python code runs in its own hypervisor isolated container using Azure Container Instances and secure, source-built packages from Anaconda through a secure software supply chain. Python in Excel keeps your data private by preventing the Python code from knowing who you are, and opening workbooks from the internet in further isolation within their own separate containers. Data from your workbooks can only be sent via the built-in xl() Python function, and the output of the Python code can only be returned as the result of the =PY() Excel function. The containers stay online as long as the workbook is open or until a timeout occurs. Your data does not persist in the Microsoft Cloud.<p>This is disappointing. A much easier way to 'keep your data private' would be to run it locally. Surely a bundled Python interpreter run inside a sandbox that prevents network access would be just as secure, and cheaper for Microsoft since they don't have to run any Azure resources to support it.