#17958: implement declare_var
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.6
Component: symbolics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Functions returning a value should not have side effects, `var` does. In
#17447, comment 23 Nils Bruin proposed to separate both usages of `var` by
introducing `declare_var`: this should behave exactly like `var` without
return value, i.e.
{{{
sage: var('y')
y
sage: declare_var('y')
y
sage: y = declare_var('y')
sage: y
sage: type(y)
<type 'NoneType'>
}}}
Later, after all books are changed, `var` without return value should be
phased out.
This and the same with functions is the most annoying problem for people
doing calculus in Sage.
* http://ask.sagemath.org/question/8145/difference-between-varx-and-
xvarx/
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Ticket URL: <http://trac.sagemath.org/ticket/17958>
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