On Friday, January 18, 2013, Steven D'Aprano wrote: > I wish to add a key to a dict only if it doesn't already exist, but do it > in a thread-safe manner. > > The naive code is: > > if key not in dict: > dict[key] = value > > > but of course there is a race condition there: it is possible that
another thread may have added the same key between the check and the > store. > > How can I add a key in a thread-safe manner? > I'm not entirely sure, but have you investigated dict.setdefault() ? -- Cheers, Chris -- http://rebertia.com
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