On Sat, Dec 5, 2015 at 12:56 PM, Noufal Ibrahim KV <nou...@nibrahim.net.in> wrote:
> > So I came across this today.. > > >>> class Number(object): > ... def __init__(self, n): > ... self.n = n > ... > >>> m = Number(10) > >>> n = Number(5) > >>> > >>> m < n > True > > This is documented like so > > > If no __cmp__(), __eq__() or __ne__() operation is defined, class > > instances are compared by object identity (“address”). > > over here > https://docs.python.org/2/reference/datamodel.html#object.__cmp__ > > It seems a rather arbitrary thing to do. Why is it implemented at all? > I'd expect it to just break with a TypeError similar to what would > happen if I do > > >>> m + n > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: unsupported operand type(s) for +: 'Number' and 'Number' > >>> > Thats why you should use Python 3. Here is what you get with Python 3. >>> class Foo: pass ... >>> a = Foo() >>> b = Foo() >>> >>> a < b Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unorderable types: Foo() < Foo() That would give True in Python 2. Anand _______________________________________________ BangPypers mailing list BangPypers@python.org https://mail.python.org/mailman/listinfo/bangpypers
