[sage-devel] Re: Hm, seemingly wrong bracketing works anyway?

2016-01-26 Thread Eric Gourgoulhon 
Quite surprising!
Indeed, one has

sage: preparse("[1..len(a])")
'(ellipsis_range(Integer(1),Ellipsis,len(a)))'

So the culprit seems to be sage preparser.


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Re: [sage-devel] Re: Hm, seemingly wrong bracketing works anyway?

2016-01-26 Thread William Stein 
On Tue, Jan 26, 2016 at 12:40 PM, Eric Gourgoulhon
 wrote:
> Quite surprising!
> Indeed, one has
>
> sage: preparse("[1..len(a])")
> '(ellipsis_range(Integer(1),Ellipsis,len(a)))'
>
> So the culprit seems to be sage preparser.

The preparser barely "parses" -- it just does some transformations
before the actual parsing happens.  In this case the transformation
changes something that should be invalid syntax (if "the sage
language" had an official specified syntax, which it doesn't) into
something that is valid.  Amusing.

William

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William (http://wstein.org)

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