https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-october-2019-office-updates-with-fixes-improvements/

Microsoft released the October 2019 non-security Microsoft Office updates that fix issues and add improvements to Windows Installer (MSI) editions of Office 2013 2010, Office 2013, and Office 2016.

For instance, after applying this month's update, "Outlook now can block the sending and receiving of Python files (.py, .pyc, .pyo, .pyw, .pyz and .pyzw) as attachments."