Strange behaviour of __cmp__

[janeaustine50@hotmail.com]

See the following...
[color=blue][color=green][color=darkred]
>>> class X(list):[/color][/color][/color]
def __cmp__(self,an X):
print "comparing from",id(self)
return cmp(self.v,anX. v)

[color=blue][color=green][color=darkred]
>>> x1=X()
>>> x2=X()
>>> x1.v=-1
>>> x2.v=100
>>> x1>x2[/color][/color][/color]
False[color=blue][color=green][color=darkred]
>>> x1<x2[/color][/color][/color]
False

I expected x1>x2 or x1<x2 were False and True respectively.

[Robert Kern]

Re: Strange behaviour of __cmp__

janeaustine50@h otmail.com wrote:[color=blue]
> See the following...
>
>[color=green][color=darkred]
>>>>class X(list):[/color][/color]
>
> def __cmp__(self,an X):
> print "comparing from",id(self)
> return cmp(self.v,anX. v)
>
>
>[color=green][color=darkred]
>>>>x1=X()
>>>>x2=X()
>>>>x1.v=-1
>>>>x2.v=100
>>>>x1>x2[/color][/color]
>
> False
>[color=green][color=darkred]
>>>>x1<x2[/color][/color]
>
> False
>
> I expected x1>x2 or x1<x2 were False and True respectively.[/color]

list.__lt__ and list.__gt__ are being used in preference to X.__cmp__.
Override these methods.

--
Robert Kern
rkern@ucsd.edu

"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter