Protection¶

The accretive.protection subpackage offers variants on the main package modules. The variants are classes with accretive attributes, ensuring that the classes, themselves, for various kinds of accretive data structures are not susceptible to accidental state change.

>>> from accretive.protection import Object

Let us illustrate this use case by defining a protected accretive object class.

>>> class MyProtectedObject( Object ):
...     class_attr = 'Cannot be changed'
...
>>> MyProtectedObject.class_attr
'Cannot be changed'

Attempting to reassign the protected class attribute raises an error.

>>> MyProtectedObject.class_attr = 'New value'
Traceback (most recent call last):
...
accretive.exceptions.IndelibleAttributeError: Cannot reassign or delete existing attribute 'class_attr'.

Attempting to delete the protected class attribute also raises an error.

>>> del MyProtectedObject.class_attr
Traceback (most recent call last):
...
accretive.exceptions.IndelibleAttributeError: Cannot reassign or delete existing attribute 'class_attr'.