#9362: Invalidate None as a vertex label.
-------------------------------+--------------------------------------------
   Reporter:  boothby          |          Owner:  jason, mvngu, ncohen, rlm
       Type:  defect           |         Status:  needs_review             
   Priority:  major            |      Milestone:  sage-pending             
  Component:  graph theory     |       Keywords:  sd35.5                   
Work_issues:                   |       Upstream:  N/A                      
   Reviewer:  Paul Zimmermann  |         Author:  Lukáš Lánský             
     Merged:                   |   Dependencies:  #11739                   
-------------------------------+--------------------------------------------

Comment(by brunellus):

 (I just removed this part:

 {{{
 - self._nxg.add_nodes_from(vertices)
 + for v in vertices:
 +     self.add_vertex(v)
 }}}

 . #11739 takes care what happens there.)

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9362#comment:14>
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