On 21-Jan-08, at 10:21 PM, Robert Bradshaw wrote:
>
>
> On Jan 20, 2008, at 11:13 PM, William Stein wrote:
>
>> On Jan 20, 2008 2:58 PM, Nick Alexander <[EMAIL PROTECTED]>
>> wrote:
>>>
>>>
>>> On 20-Jan-08, at 2:47 PM, Simon King wrote:
>>>
>>>>
>>>> Dear Nick
>>>>
>>>> On Jan 20, 8:24 pm, Nick Alexander <[EMAIL PROTECTED]> wrote:
>>>>> I've always hated that x/y and print x/y can do different
>>>>> things at
>>>>> the prompt, but it sounds like I'm fighting a losing battle.
>>>>
>>>> Sorry for coming into your discussion. I actually appreciate that
>>>> x/y
>>>> and print x/y do different things, for the following reason.
>>>>
>>>> If someone defines some sage object X and just types
>>>> sage: X
>>>> then the command is very short, and when i ask a short question,
>>>> the
>>>> answer ought to be short as well.
>>>>
>>>> On the other hand, if the user's demand on displaying X is more
>>>> elaborate, such as
>>>> sage: print X
>>>> then the displayed information should be more elaborate as well.
>>>
>>> One reason that I don't like this is that in the notebook, only the
>>> final 'sage: X' shows that way. Before that, one must use print.
>>> Why the different semantics?
>>>
>>
>> Currently in the notebook we have this behavior:
>>
>> {{{id=14|
>> a = 5
>> a
>> 2 + 2
>> ///
>> 4
>> }}}
>>
>> Nick asks why this doesn't happen:
>>
>> {{{id=14|
>> a = 5
>> a
>> 2 + 2
>> ///
>> 5
>> 4
>> }}}
>>
>> The answer is --- I couldn't figure out how to implement the latter
>> (in sage/server/notebook/worksheet.py).
>> That's it. I just don't know how to do it. It's nothing more
>> mysterious than that. If I could figure
>> out how to implement the latter I would.
>
> I'd imagine one would do it the same was as doctests, (almost) always
> assigning to a variable and then spitting out the string if it is not
> None... This doesn't solve the issue printing things from within a
> function (and detecting that would require more complicated parsing
> too).
Doctests do not assign to a variable, at least I don't believe they
do. The code is actually evaled with stdout hooked, etc.
IPython has an Out[] dictionary of recent results. Could that be
used in this situation?
Nick
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