Why is dictionary.keys() a list and not a set?

Christoph Zwerschke cito at online.de
Thu Nov 24 17:33:42 CET 2005

jepler at unpythonic.net schrieb:
> You can already get a set from a dictionary's keys in an efficient manner:
>>>>l = dict.fromkeys(range(10))
> Set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])

Good point. I expected that set(l) = set(l.items()) and not 
set(l.keys()), but the latter would not work with mutable values. See 
discussion with Martin.

-- Christoph

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