[Bug 871864] Re: Can't create two-directional edges: 'lost B A edge'

[Matthias Klose]

11.04 is obsolete. please recheck with newer versions.


** Changed in: python-pygraphviz (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/871864

Title:
  Can't create two-directional edges: 'lost B A edge'

Status in python-pygraphviz package in Ubuntu:
  Invalid

Bug description:
  Kubuntu 11.04
  python-pygraphviz 1.0-1build1 from Ubuntu repositories.

  My DOT file:
  strict digraph graphName {
  concentrate=true
  A->B
  B->A
  }

  it compiles OK with dot:
  dot simple2.dot -Tpng:cairo:gd -o testi.png

  but when I try it with pygraphviz:

  
  #!/usr/bin/env python
  import pygraphviz as pgv
  B=pgv.AGraph('simple2.dot') # create a new graph from file
  B.layout() # layout with default (neato)
  B.draw('simple.png') # draw png

  I get this:

  
  /usr/lib/pymodules/python2.7/pygraphviz/agraph.py:1170: RuntimeWarning: Error: lost B A edge

    warnings.warn("".join(errors),RuntimeWarning)

  and the generation is aborted.

  Removing or commenting the concentrate -line from the .dot file, the
  output is generated but with two one-headed arrows instead of one two-
  headed.

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