On Tue, Apr 8, 2014 at 2:02 PM, Josh English <joshua.r.engl...@gmail.com> wrote: > On Sunday, April 6, 2014 12:44:13 AM UTC-7, Giuliano Bertoletti wrote: > > >> obj = brands_seen.get(brandname) >> >> if obj is None: >> obj = Brand() >> brands_seen[brandname] = obj >> >> > > Would dict.setdefault() solve this problem? Is there any advantage to > defaultdict over setdefault()
That depends on whether calling Brand() unnecessarily is a problem. Using setdefault() is handy when you're working with a simple list or something, but if calling Brand() is costly, or (worse) if it has side effects that you don't want, then you need to use a defaultdict. I think this is a textbook example of why defaultdict exists, though, so I'd be inclined to just use it, rather than going for setdefault :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
