Elementwise -//- first release -//- Element-wise (vectorized) function, method and operator support for iterables in python.

[Robert Kern]

On 12/21/11 3:15 PM, Nathan Rice wrote:

>> Incidentally, displaying an ElementwiseProxy instance doesn't go down
>> well with iPython:
>>
>> In [1]: from elementwise import *
>>
>> In [2]: e = ElementwiseProxy(['one','two','three'])
>>
>> In [3]: e
>> Out[3]: ERROR: An unexpected error occurred while tokenizing input
>> The following traceback may be corrupted or invalid
>> The error message is: ('EOF in multi-line statement', (6, 0))
>
> I love IPython, but it has had known problems with iterators for
> years.  A long time ago, I agonized over what I thought was a bug in
> my code where itertools.count would skip numbers in IPython, but my
> unit tests all passed.  Everything should work fine if you tuple() it
> first.

This is a different problem, actually. The problem is that the recently added 
(by me, actually) pretty-printing system tries to dispatch based on the type. In 
order to handle old-style classes, it checks for the type using .__class__ 
first. ElementProxy's __getattribute__() gets in the way here by returning a 
generator instead of the ElementProxy class.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco