#10743: Add iterator protocol to EclObject
---------------------------+------------------------------------------------
Reporter: nbruin | Owner: was
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.6.2
Component: interfaces | Keywords: ECL lisp ecllib
Author: Nils Bruin | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by nbruin):
* status: new => needs_review
Old description:
> Experience teaches that EclObjects wrapping LISP lists would often be
> convenient to iterate over in list comprehensions and for loops.
> Pythonizing the EclObject would work recursively, which is often not what
> is required: you just want to work with EclObjects wrapping the members
> of the list. The iterator protocol seems to yield a convenient and well-
> defined interface. Examples:
> {{{
> sage: from sage.libs.ecl import *
> sage: I=EclListIterator(EclObject("(1 2 3)"))
> sage: type(I)
> <type 'sage.libs.ecl.EclListIterator'>
> sage: [i for i in I]
> [<ECL: 1>, <ECL: 2>, <ECL: 3>]
> sage: [i for i in EclObject("(1 2 3)")]
> [<ECL: 1>, <ECL: 2>, <ECL: 3>]
> sage: EclListIterator(EclObject("1"))
> Traceback (most recent call last):
> ...
> TypeError: ECL object is not iterable
> }}}
New description:
Experience teaches that EclObjects wrapping LISP lists would often be
convenient to iterate over in list comprehensions and for loops.
Pythonizing the EclObject would work recursively, which is often not what
is required: you just want to work with EclObjects wrapping the members of
the list. The iterator protocol seems to yield a convenient and well-
defined interface. Examples:
{{{
sage: from sage.libs.ecl import *
sage: [i for i in EclObject("(1 2 3)")]
[<ECL: 1>, <ECL: 2>, <ECL: 3>]
sage: [i for i in EclObject("(1 2 . 3)")]
[<ECL: 1>, <ECL: 2>, <ECL: 3>]
sage: [i for i in EclObject("NIL")]
[]
sage: [i for i in EclObject("T")]
Traceback (most recent call last):
...
TypeError: ECL object is not iterable
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10743#comment:1>
Sage <http://www.sagemath.org>
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