fixedpoint cmp conundrum

[Robert Brewer]

Tim Peters wrote:
> 4. Define an __eq__ method, which returns False if its arguments
>    are non-comparable.

Looking at the SourceForge page, I think this is addressed by Bug
#887290:
https://sourceforge.net/tracker/index.php?func=detail&aid=887290&group_i
d=63070&atid=502756

I don't have 'diff' on this machine, and am *totally* swamped, but
here's the new code I ended up with:

    def __eq__(self, other):
        if isinstance(other, FixedPoint):
            xn, yn, p = _norm(self, other, FixedPoint=type(self))
            return not(cmp(xn, yn))
        else:
            return False

    def __ne__(self, other):
        if isinstance(other, FixedPoint):
            xn, yn, p = _norm(self, other, FixedPoint=type(self))
            return cmp(xn, yn)
        else:
            return True

...am I right in thinking that the presence of __eq__ and __ne__ doesn't
*harm* the class under older versions of Python?


Robert Brewer
MIS
Amor Ministries
fumanchu at amor.org