zope.interface.ro

Package zope :: Package interface :: Module ro

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Module zope.interface.ro

Compute a resolution order for an object and it's bases

$Id: ro.py,v 1.2 2005/06/24 16:52:37 nyergler Exp $

Function Summary
	`_flatten(ob, result)`
	`mergeOrderings(orderings, seen)` Merge multiple orderings so that within-ordering order is preserved
	`ro(object)` Compute a "resolution order" for an object

Function Details

mergeOrderings(orderings, seen=None)

Merge multiple orderings so that within-ordering order is preserved

Orderings are constrained in such a way that if an object appears in two or more orderings, then the suffix that begins with the object must be in both orderings.

For example:

>>> _mergeOrderings([
... ['x', 'y', 'z'],
... ['q', 'z'],
... [1, 3, 5],
... ['z']
... ])
['x', 'y', 'q', 1, 3, 5, 'z']

ro(object)

Compute a "resolution order" for an object

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