994             try:

   994             try:

   995                 delattr(unfiltered, k)

   995                 delattr(unfiltered, k)

   996             except AttributeError:

   996             except AttributeError:

   997                 pass

   997                 pass

   998         self.invalidatecaches()

   998         self.invalidatecaches()

   999 

  1000 

  1000     def invalidateall(self):

  1001     def invalidateall(self):

  1001         '''Fully invalidates both store and non-store parts, causing the

  1002         '''Fully invalidates both store and non-store parts, causing the

  1002         subsequent operation to reread any outside changes.'''

  1003         subsequent operation to reread any outside changes.'''

  1003         # extension should hook this to invalidate its caches

  1004         # extension should hook this to invalidate its caches