[C++-sig] dict surprise

[Ralf W. Grosse-Kunstleve]

I was surprised to find that

dict(w_obj.attr("__dict__")).update(some_tuple[0]);

only updates the temporary created by dict(), but not the original __dict__.
Eventually I got the desired behavior by using

w_obj.attr("__dict__").attr("update")(object(some_tuple[0]));

I convinced myself that the first statement works just the way Python works, so
fine. However, this is a bit of a trap for the novice and a specific warning in
the documentation ("don't use dict(obj1).update(obj2)") would probably be very
helpful.

Ralf

P.S.: I love the new extract<T> .


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