How to suppress graphviz warnings in Python 3?

Question

I'm using the graphviz module to render a network of nodes and links.

I use small circles as node's shape, so the labels are intentionally bigger than the nodes.

As a consequence, I get the following warning:

"Warning: node 'wave', graph 'N' size too small for label"

'Wave' is just an example of a node's label.

So, my question is: How can I suppress warnings like those?

The graphviz command I'm using is:

n.view()  # n is my digraph

I have already tried the suggestions from:

But nothing so far. Thanks in advance.

score 0 · Accepted Answer · answered May 31 '19 at 10:14

After replacing stdout with stderr, Eli's solution worked on graphviz for me.

If you happen to be using Evince, Ubuntu's builtin PDF viewer, see:

score 0 · Answer 2 · answered May 12 '21 at 13:52

For graphviz, as of v0.11, there is a silent option for the .draw() method (see graphviz docs:graphviz.view).

Apparently not on windows.

This applies to those using networkx (which uses pygraphviz) or pygraphviz.

In pygraphviz, the warnings are collected and then pushed using the warnings module (see pygraphviz/agraph.py:1390).

You can therefore silent the warnings specifically when drawing: warnings docs:Temporarily Suppressing Warnings

import warnings

<create graph etc>

with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    g.draw()

2 Answers2