Sentry¶
- class
Sentry
¶ A Basic falsey singleton type useful for when
None
actually 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:
subclassing
setting attributes