Steven D'Aprano wrote:
I'm pretty sure the answer to this is No, but I thought I'd ask just in
case...
Is there a fast way to see that a dict has been modified? ...
Of course I can subclass dict to do this, but if there's an existing way,
that would be better.
def mutating(method):
def replacement(self, *args, **kwargs):
try:
return method(self, *args, **kwargs)
finally:
self.serial += 1
replacement.__name__ = method.__name__
return replacement
class SerializedDictionary(dict):
def __init__(self, *arg, **kwargs):
self.serial = 0
super(SerializedDictionary).__init__(self, *arg, **kwargs)
__setitem__ = mutating(dict.__setitem__)
__delitem__ = mutating(dict.__delitem__)
clear = mutating(dict.clear)
pop = mutating(dict.pop)
popitem = mutating(dict.popitem)
setdefault = mutating(dict.setdefault)
update = mutating(dict.update)
d = SerializedDictionary(whatever)
Then just use dict.serial to see if there has been a change.
--Scott David Daniels
scott.dani...@acm.org
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