Kirby Urner wrote:
>>Kirby
>>
>>PS: since you've been studying subclassing primitive types using __new__,
>>maybe you could show us a user-defined floating point type that reports
>>two numbers equal if their absolute value difference is less than e.
>>Anyone?
>>
>
Fuzzy redone a breath:
class Fuzzy(float):
tol = 1e-8
def __new__(cls, arg=0.0):
return float.__new__(cls, arg)
def __eq__(self, other):
return abs(self - other) < self.tol
> ...
Here's the problem:
Your notion of equality is not transitive. That's tough -- it
invalidates the assumptions of the float type (and all basic types).
Also, you didn't tweak hash, so a dictionary with these things in them
would not find entries that turn out to be equal.
--Scott David Daniels
[EMAIL PROTECTED]
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