Diez B. Roggisch wrote:
>> But I'd say that it's not intuitive that for sets x in y can be false
>> (without raising an exception!) while the doing the same with a tuple
>> raises an exception. Where is this difference documented?
>
> 2.3.7 Set Types -- set, frozenset
>
> ...
>
> Set elements are like dictionary keys; they need to define both __hash__ and
> __eq__ methods.
> ...
>
> And it has to hold that
>
> a == b => hash(a) == hash(b)
>
> but NOT
>
> hash(a) == hash(b) => a == b
>
> Thus if the hashes vary, the set doesn't bother to actually compare the
> values.
> [...]
Ok, I understand.
But isn't it a (minor) problem that using a set like this:
# -*- coding: UTF-8 -*-
FIELDS_SET = set(("Fächer", ))
print u"Fächer" in FIELDS_SET
print u"Fächer" == "Fächer"
shadows the error of not setting sys.defaultencoding()?
Dennis
--
http://mail.python.org/mailman/listinfo/python-list
