#10105: cremona_letter_code does not handle erroneous input gracefully.
-------------------------------+--------------------------------------------
   Reporter:  drkirkby         |       Owner:  cremona     
       Type:  defect           |      Status:  needs_review
   Priority:  minor            |   Milestone:  sage-4.6    
  Component:  elliptic curves  |    Keywords:  databases   
     Author:  John Cremona     |    Upstream:  N/A         
   Reviewer:  David Kirkby     |      Merged:              
Work_issues:                   |  
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Changes (by drkirkby):

  * reviewer:  => David Kirkby


Comment:

 Thanks John. I think its third time lucky, as I can't find any faults with
 this.

 I've tried every combination of junk I can think of to throw at
 {{{cremona_letter_code()}}}, but it always behaves properly. It will not
 accept any augments except one non-negative integer.

 It passes the doctest

 {{{
 drkir...@hawk:~/sage-4.6.alpha3$ ./sage -t  -long
 devel/sage/sage/databases/cremona.py
 sage -t -long "devel/sage/sage/databases/cremona.py"
          [3.9 s]

 ----------------------------------------------------------------------
 All tests passed!
 Total time for all tests: 3.9 seconds
 }}}

 However, I don't feel my Python skills are sufficient to press the
 positive review, so I hope someone with more Python knowledge will look at
 this. But I can't fault it myself.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10105#comment:11>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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