Why is dictionary.keys() a list and not a set?
cito at online.de
Fri Nov 25 10:02:25 CET 2005
bonono at gmail.com schrieb:
> And this, again from the doc(about mapping objects):
> A mapping object maps immutable values to arbitrary objects.
> Seems that is questionable too.
> again would give TypeError, list object are unhashable.
That's a good example showing that the term 'mutable' is not so
well-defined as it may seem.
If you set b=; a=(1,b); should a be considered mutable (because you
can change its value by changing b), or should it be considered
immutable (because it is a tuple)?
More information about the Python-list