A Basic falsey singleton type useful for when
Noneactually means something.
Only one instance of Sentry may be created (within a session). To prevent weirdness in with import reloads or multiprocessing we test equality / based on is tested based on class membership and disallow subclassing.
- The following actions are is forbidden on the Sentry type:
- setting attributes
Initialize self. See help(type(self)) for accurate signature.