On Sonntag 29 Mai 2011, Tim Delaney wrote: > There's a second part the mystery - sets and dictionaries (and > I think lists) assume that identify implies equality (hence > the second result). This was recently discussed on > python-dev, and the decision was to leave things as-is.
On Sonntag 29 Mai 2011, Grant Edwards wrote: > Even if they are the same nan, it's still not equal to itself. if I understand this thread correctly, they are not equal to itself as specified by IEEE but Python treats them equal in sets and dictionaries for performance reasons -- Wolfgang -- http://mail.python.org/mailman/listinfo/python-list
