pickle.load(file) fails

[eivaremir]

The following code must be defined outside the constructor

_roles = set()
_structure = defaultdict(set)
_grants = set()

If you try to save the state of the acl in a file and the load it again using picke.load(file), youll get an error saying these 3 attributes

are not defined, because when loading thru this way the constructor is not being executed.

Doing this im able to create a local backup of the acl and dont loosing it at runtime