cs.resources 20160827

resourcing related classes and functions

NestingOpenClosedMixin

This is a mixin class for objects with multiple open/close users. After the last .close, the object’s .shutdown method is called. This also presented the context manager interface to allow open/close thus:

with obj:
  do stuff while open

@notclosed

Decorator for object methods which must not be called after the object is closed.