No module named 'graphviz' in Jupyter Notebook

Question

I tried to draw a decision tree in Jupyter Notebook this way.

mglearn.plots.plot_animal_tree()

But I didn't make it in the right way and got the following error message.

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-65-45733bae690a> in <module>()
      1 
----> 2 mglearn.plots.plot_animal_tree()

~\Desktop\introduction_to_ml_with_python\mglearn\plot_animal_tree.py in plot_animal_tree(ax)
      4 
      5 def plot_animal_tree(ax=None):
----> 6     import graphviz
      7     if ax is None:
      8         ax = plt.gca()

ModuleNotFoundError: No module named 'graphviz

So I downloaded Graphviz Windows Packages and installed it.

And I added the PATH installed path(C:\Program Files (x86)\Graphviz2.38\bin) to USER PATH and (C:\Program Files (x86)\Graphviz2.38\bin\dot.exe) to SYSTEM PATH.

And restarted my PC. But it didnt work. I still can't get it working.

So I searched over the internet and got another solution that, I can add the PATH in my code like this.

import os
os.environ["PATH"] += os.pathsep + 'C:/Program Files (x86)/Graphviz2.38/bin'

But it didn't work. So I do not know how to figure it out now.

I use the Python3.6 integrated into Anacode3.

And I ALSO tried installing graphviz via PIP like this.

pip install graphviz

BUT it still doesn't work.

Hope someone can help me, sincerely.

Answer 1

in Anaconda install

• python-graphviz
• pydot

This will fix your problem

Answer 2

As @grrr answered above, here is the code:

conda install -c anaconda python-graphviz

conda install -c anaconda pydot

Answer 3

In case if your operation system is Ubuntu I recommend to try command:

sudo apt-get install -y graphviz libgraphviz-dev