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# PlanarEmbedding.check_structure

PlanarEmbedding.check_structure()

  Runs without exceptions if this object is valid.

  Checks that the following properties are fulfilled:

  - Edges go in both directions (because the edge attributes differ).

  - Every edge has a ‘cw’ and ‘ccw’ attribute which corresponds to a correct planar embedding.

  Running this method verifies that the underlying Graph must be planar.

  Raises:
    NetworkXException

      This exception is raised with a short explanation if the PlanarEmbedding is invalid.