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  • Committer: Christopher Armstrong
  • Date: 2008-06-10 10:56:01 UTC
  • Revision ID: radix@twistedmatrix.com-20080610105601-l9qfvqjf88e7j8b6
Import landscape-client into public branch

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landscape/diff.py
 
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def diff(old, new):
 
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    """Returns the set of differences between two C{dict}s.
 
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    @return: A 3-tuple of dicts with the changes that would need to be
 
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        made to convert C{old} into C{new}: C{(creates, updates, deletes)}
 
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    """
 
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    new_keys = set(new.iterkeys())
 
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    old_keys = set(old.iterkeys())
 
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    creates = {}
 
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    for key in new_keys - old_keys:
 
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        creates[key] = new[key]
 
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    updates = {}
 
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    for key in old_keys & new_keys:
 
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        if old[key] != new[key]:
 
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            updates[key] = new[key]
 
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    deletes = {}
 
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    for key in old_keys - new_keys:
 
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        deletes[key] = old[key]
 
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    return creates, updates, deletes