#7537: list(SR('c').iterator()) is empty
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Reporter: malb | Owner: burcin
Type: defect | Status: new
Priority: critical | Milestone: sage-4.3.4
Component: symbolics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by burcin):
Do you mean return an iterable which returns `self` when `.next()` is
called?
If you're traversing a symbolic expression, and working with iterators, I
can't think of any case where symbols, constants and numeric coefficients
don't form a special case which will be treated separately. The usual way
to write code to traverse the expression tree should check if
`.operator()` returns `None`.
I admit that I don't use this interface often enough to decide on the
design though. The recent thread on sage-devel about indexing parts of
expressions also shows that this needs work.
Do you have a use case we can work from? How did you run into this?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7537#comment:3>
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