problem in repeating the circular tree example

[Pengyao Jiang]

Hi there,

I'm very new to networkx. I have netwrokx version 1.11, python version 2.7.11 (under anaconda environment). I tried to repeat circular tree the example (http://networkx.github.io/documentation/latest/examples/drawing/circular_tree.html). However, when it tried to import graphviz_layout function, it failed. It says it needs Graphviz and either PyGraphviz or Pydot. I installed Graphviz and PyGraphviz, but the I still get the same error. I also tried to install Pydot, it seems to have bugs or issues here and there. I am just wondering what exactly needs to be installed (and what version?) in order make this example work? Thank you!!!

[Daniel Schult]

Did you install everything for the same environment within anaconda? Sometimes you end up installing python packages into the system python environment, etc.

Did you run the tests for pygraphviz (import pygraphviz; pygraphviz,test())? Can you show us the error you are getting? Did you get the Graphviz libraries or just the executable?  If I recall, pygraphviz doesn't have a conda package, did you use pip to install or is there a pygraphviz package now? 

On Fri, Apr 1, 2016 at 5:40 PM, Pengyao Jiang <pyji...@gmail.com> wrote:

Hi there,

I'm very new to networkx. I have netwrokx version 1.11, python version 2.7.11 (under anaconda environment). I tried to repeat circular tree the example (http://networkx.github.io/documentation/latest/examples/drawing/circular_tree.html). However, when it tried to import graphviz_layout function, it failed. It says it needs Graphviz and either PyGraphviz or Pydot. I installed Graphviz and PyGraphviz, but the I still get the same error. I also tried to install Pydot, it seems to have bugs or issues here and there. I am just wondering what exactly needs to be installed (and what version?) in order make this example work? Thank you!!!

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[Pengyao Jiang]

Hi,

Yes, I did install everything for the same environment within anaconda, not the system python environment. 

I can run the  pygraphviz.test() without any problem. I noticed the example code was temporarily modified last Friday into:

try:

    import pygraphviz

    from networkx.drawing.nx_agraph import graphviz_layout

except ImportError:

    try:

        import pydotplus

        from networkx.drawing.nx_pydot import graphviz_layout

    except ImportError:

        raise ImportError("This example needs Graphviz and either "

                          "PyGraphviz or PyDotPlus")

In this case, I can run the example without any problem. I guess the old import:

try:
    from networkx import graphviz_layout
except ImportError:
    raise ImportError("This example needs Graphviz and either PyGraphviz or Pydot")

tried to use pydot, which I don't successfully installed. 

[Daniel Schult]

Got it.... yes - we fixed a namespace issue in PR #1930 in January because of the namespace collision between using pydot and pygraphviz in graphviz_layout.

Sorry for the confusion.  I'm not sure how the change would happen last Friday. Is it working for you now?

[Pengyao Jiang]

Yes, it is working for me now! Thanks!