RainyDay wrote: > Hi, in python 3.4.1, I get this surpising behaviour: > >>>> l=Loc(0,0) >>>> l2=Loc(1,1) >>>> l>l2 > False >>>> l<l2 > True >>>> l<=l2 > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: unorderable types: Loc() <= Loc() >>>> l==l2 > False >>>> l<l2 or l==l2 > True > > Loc implements both __lt__ and __eq__, which should be enough (?),
These two methods should be sufficient if you use the functools.total_ordering class decorator, see https://docs.python.org/dev/library/functools.html#functools.total_ordering > but even after I've added __lte__, I still have the error. There is no special method of that name; it should probably be __le__(). > > implementation: > > class Loc: > def __init__(self, x, y): > self._loc = x, y > self.x, self.y = x, y > > def __eq__(self, other): > return self._loc == getattr(other, "_loc", None) Note that None is not a good default when _loc is expected to be a tuple: >>> None < () Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unorderable types: NoneType() < tuple() > > def __lt__(self, other): > return self._loc < other._loc > > - andrei -- https://mail.python.org/mailman/listinfo/python-list
