Am 07.07.2014 17:55, schrieb Ethan Furman:
On 07/07/2014 04:22 AM, Andreas Maier wrote:
Where is the discrepancy between the documentation of == and its
default implementation on object documented?
There's seems to be no discrepancy (at least, you have not shown it),
The documentation states consistently that == tests the equality of the
value of an object. The default implementation of == in both 2.x and 3.x
tests the object identity. Is that not a discrepancy?
but to answer the question about why the default equals operation is an
identity test:
- all objects should be equal to themselves (there is only one that
isn't, and it's weird)
I agree. But that is not a reason to conclude that different objects (as
per their identity) should be unequal. Which is what the default
implementation does.
- equality tests should not, as a general rule, raise exceptions --
they should return True or False
Why not? Ordering tests also raise exceptions if ordering is not
implemented.
Andy
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