#11692: Creating a multiedged graph gives wrong error
----------------------------+-----------------------------------------------
   Reporter:  iandrus       |          Owner:  iandrus   
       Type:  defect        |         Status:  new       
   Priority:  trivial       |      Milestone:  sage-4.7.2
  Component:  graph theory  |       Keywords:            
Work_issues:                |       Upstream:  N/A       
   Reviewer:                |         Author:            
     Merged:                |   Dependencies:            
----------------------------+-----------------------------------------------
 When creating a multiedged graph with multiedges=False it fails when
 trying to create an exception thereby leading to an unhelpful error
 message.  We merely have to import choice for it to function correctly.

 {{{
 sage: Graph([[1,2],[1,2]],multiedges=False)
 ---------------------------------------------------------------------------
 NameError                                 Traceback (most recent call
 last)

 /Users/gvol/<ipython console> in <module>()

 /Users/gvol/vcs/cur-sage/local/lib/python2.6/site-
 packages/sage/graphs/graph.py in __init__(self, data, pos, loops, format,
 boundary, weighted, implementation, sparse, vertex_labels, **kwds)
    1127                 if len(uniq(data[u])) != len(data[u]):
    1128                     if multiedges is False:
 -> 1129                         raise ValueError("Non-multigraph input
 dict has multiple edges (%s,%s)"%(u, choice([v for v in data[u] if
 data[u].count(v) > 1])))
    1130                     if multiedges is None: multiedges = True
    1131             if multiedges is None: multiedges = False

 NameError: global name 'choice' is not defined
 }}}

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11692>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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