Lambda a écrit :
Hi,
I'd like to define a class to use it as a dictionary key:
Others already answered (define the __hash__ method). Just one point:
the value returned by the __hash__ method should not change for the
lifetime of the object. So if you use instance attributes to compute the
Christian Heimes writes:
> > def __hash__(self): return (self.term, self.doc_freq)
> >
> > is probably the easiest.
>
> The __hash__ function must return an integer:
Oh oops. Try:
def __hash__(self): return hash((self.term, self.doc_freq))
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Paul Rubin schrieb:
> Lambda writes:
>> When I run it, it says "TypeError: unhashable instance"
>>
>> It looks like I can't use the new class object as the dictionary key.
>> What should I do?
>
> You have to add a __hash__ method. Untested:
>
> def __hash__(self): return (self.term, self.d
On Tue, Sep 15, 2009 at 9:47 PM, Lambda wrote:
> When I run it, it says "TypeError: unhashable instance"
>
> I believe you need to implement __hash__() for the class. Make sure your
class returns a unique identifier for a certain value.
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Lambda writes:
> When I run it, it says "TypeError: unhashable instance"
>
> It looks like I can't use the new class object as the dictionary key.
> What should I do?
You have to add a __hash__ method. Untested:
def __hash__(self): return (self.term, self.doc_freq)
is probably the easiest
Hi,
I'd like to define a class to use it as a dictionary key:
class dict_entry:
def __init__(self, term = "", doc_freq = 0):
self.term = term
self.doc_freq = doc_freq
def __cmp__(self, entry):
return isinstance(entry, dict_entry) and cmp(self.term,
entry.term)
def __str__(self
