#12247: var(['x','y']) should work but doesn't
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Reporter: was | Owner: burcin
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-5.0
Component: symbolics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Volker Braun
Merged: | Dependencies:
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Comment(by nbruin):
The pythonic thing would be to realize that the important part of the list
here is that it is an iterable and hence accepting an iterable might be
the right thing to do. But since strings are iterable too, this doesn't
work.
So either lists or strings would need to be special cased. This breaks
subclassing (if someone writes a class that is supposed to mimic strings
or lists, how do you tell which is which? isinstance doesn't work on
builtins, and multiple inheritance would mean you would not necessarily be
able to decide based on that anyway. Look in the mro which of list or str
you meet first?)
Perhaps safer is to accept var('x','y') and hence also var(*['x','y']).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12247#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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