#17958: implement declare_var, deprecate (None)var
-----------------------------+------------------------
Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.6
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
Replying to [comment:68 slabbe]:
> Apparently, it is ipython that provides this. I learn about the
existence of this when I recently read the
[http://en.wikipedia.org/wiki/Sage_(mathematics_software) wikipedia page
of Sage]:
>
> {{{
> x, a, b, c = var('x, a, b, c')
> # Note that IPython also supports a faster way to do this, by calling
> # this equivalent expression starting with a comma:
> # ,var x a b c
> }}}
Yuck. It's a good illustration of the general confusion caused by the
current behaviour of `var`. Reading the IPython documentation,
{{{
,var x a b c
}}}
is equivalent to
{{{
var("x","a","b","c")
}}}
which happens to do almost the same effect as the other `var` command
given, except that the second form consists of a value returning
expression and the first form is a non-expression statement that does not
return a value (and hence prints nothing in the REPL).
--
Ticket URL: <http://trac.sagemath.org/ticket/17958#comment:69>
Sage <http://www.sagemath.org>
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