On Aug 16, 2019, at 06:11, Ronald Oussoren via Python-Dev <
python-dev@python.org> wrote:
As a workaround it is possible to install Python by choosing “open” from the context-menu of in the Finder instead of double clicking on the installer. This is currently necessary because the macOS Catalina has stricter requirements for signing installers, and the
Python.org installers do not yet comply with those stricter requirements.
And we will be addressing this for current Python installers prior to the upcoming official release of macOS 10.15 Catalina.