#13957: catch ValueError in comparisons
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       Reporter:  vdelecroix            |         Owner:  vdelecroix            
        
           Type:  defect                |        Status:  positive_review       
        
       Priority:  major                 |     Milestone:  
sage-duplicate/invalid/wontfix
      Component:  coercion              |    Resolution:                        
        
       Keywords:  coercion, comparison  |   Work issues:                        
        
Report Upstream:  N/A                   |     Reviewers:                        
        
        Authors:                        |     Merged in:                        
        
   Dependencies:                        |      Stopgaps:                        
        
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Changes (by vdelecroix):

 * cc: vdelecroix (added)
  * status:  needs_review => positive_review
  * milestone:  sage-5.10 => sage-duplicate/invalid/wontfix
  * author:  Vincent Delecroix =>


Old description:

> When element construction by a parent raise a ValueError, it prevents
> using the coercion in comparisons.

New description:

 When element construction by a parent raise a ValueError, it prevents
 using the coercion in comparisons.

 Note: a coercion should not fail and there is no reason to catch a
 ValueError.

--

Comment:

 Hi Travis,

 I open the ticket because we made some stupid design decisions for #12224.
 The point was that we implement a coercion from lists to Words and we
 raised some `ValueError` if the content of the list does not match the
 alphabet. As I learn, it is definitely not what we want from a coercion: a
 coercion should always succeed.

 I close it as wont fix.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13957#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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