message: Clarify pydot and graphviz instructions.
diff: @@ -100,15 +100,17 @@ def model_to_dot(model,
  from tensorflow.python.keras.engine import network
  if not check_pydot():
  + message = (
  + 'Failed to import pydot. You must `pip install pydot` '
  + 'and install graphviz (https://graphviz.gitlab.io/download/), ',
  + 'for `pydotprint` to work.')
  if 'IPython.core.magics.namespace' in sys.modules:
  # We don't raise an exception here in order to avoid crashing notebook
  # tests where graphviz is not available.
  - print('Failed to import pydot. You must install pydot'
  - ' and graphviz for `pydotprint` to work.')
  + print(message)
  return
  else:
  - raise ImportError('Failed to import pydot. You must install pydot'
  - ' and graphviz for `pydotprint` to work.')
  + raise ImportError(message)
  if subgraph:
  dot = pydot.Cluster(style='dashed', graph_name=model.name)
  