sum() requires number, not simply __add__

[Terry Reedy]

On 2/24/2012 8:23 AM, Roy Smith wrote:
> In article<mailman.123.1330083762.3037.python-list at python.org>,
>   Antoon Pardon<antoon.pardon at rece.vub.ac.be>  wrote:
>
>>> Python doesn't try to prevent people from shooting themselves in the foot.
>>>
>> Yes it does! A simple example is None as a keyword to prevent
>> assignments to it.
>
> Hmmm.  Just playing around with some bizarre things to do with None, and
> discovered this:
>
>>>> import sys as None
>
> doesn't give an error, but also doesn't assign the module to the symbol
> 'None'.  Weird.

In 3.2
 >>> import sys as None
SyntaxError: invalid syntax

-- 
Terry Jan Reedy