You could just check the count of that many items (since its unique it
should always be 1 or 0):
if Photo.objects.filter(flickr_id=photo("id")).count() == 0:
# create the object ...
But its my understanding that Python exceptions are not as heavy weight
as they are in languages like C++/Java/C# so not only is either way
probably fine, the exception approach is actually fairly common in
Python. But I understand your discomfort - I had always taught myself
(pre Python) to only use exceptions for exceptional cases, i.e. things
you didn't expect to happen.
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