Python 3.9 is now generally available.

google.appengine.api.modules.get_num_instances

Return the number of instances that are set for the given module version.

This is only valid for fixed modules, an error will be raised for automatically-scaled modules. Support for automatically-scaled modules may be supported in the future.

module String containing the name of the module to fetch this info for, if None the module of the current instance will be used.
version String containing the name of the version to fetch this info for, if None the version of the current instance will be used. If that version does not exist in the other module, then an InvalidVersionError is raised.

The number of instances that are set for the given module version.

InvalidVersionError on invalid input.