On 8/9/2017 9:25 AM, Marko Rauhamaa wrote: > r...@zedat.fu-berlin.de (Stefan Ram): > >> Steve D'Aprano <steve+pyt...@pearwood.info> writes: >>> There's a word for frozen list: "tuple". >> Yes, but one should not forget that a tuple >> can contain mutable entries (such as lists). > Not when used as keys: > > >>> hash(([], [])) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: unhashable type: 'list' > > > Marko Hence the word 'can' and not 'will' or 'must' or 'shall' ...
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