On Sat, Jan 19, 2013 at 7:16 PM, Vito De Tullio <vito.detul...@gmail.com> wrote:
> yeah, sure, but with a fixed value :)
>
> I mean: if the value is not important, why bother at all trying not to
> override it with an if or a lock or other tecniques? doing
>
> d['key'] = 'fixed_value'
>
> multiple times in different threads is not a problem in my eyes...
How fixed is fixed?
>>> d={}
>>> d.setdefault("foo",1)
1
>>> d.setdefault("bar",2)
2
>>> d
{'bar': 2, 'foo': 1}
If list append is guaranteed atomic, and since setdefault is
apparently atomic, then this would be a thread-safe way to maintain a
dictionary of lists:
>>> d={}
>>> lst=d.setdefault("foo",[])
>>> lst.append(1)
Are those guarantees made?
ChrisA
--
http://mail.python.org/mailman/listinfo/python-list
