Getting attribute error : module 'matplotlib.pyplot' has no attribute 'canvas'

Question

    plt.figure(figsize=(8, 8))

    sns.heatmap(conf_matrix, annot=True, fmt="d");
    plt.title("Confusion matrix")
    plt.ylabel('True class')
    plt.xlabel('Predicted class')

    html_fig = mpld3.fig_to_html(plt,template_type='general')
    plt.close(plt)

Code in HTML file to fetch the image :

    <div id="fig_container">
    {{ div_figure|safe }}
</div>

Using latest versions of Python and Django. On executing the attribute error is displayed

module 'matplotlib.pyplot' has no attribute 'canvas'

I am new to it and unable to resolve the error. Please help!!!

Please add a few lines more context around that code snippet, particularly your import of pyplot and your use of canvas. — David Goldfarb
– David Goldfarb, Commented Mar 18, 2019 at 8:07
It seems you call mpld3.fig_to_html(matplotlib.pyplot) which is not correct. That function would probably expect a figure as input, fig = plt.figure(); ....; mpld3.fig_to_html(fig) — ImportanceOfBeingErnest
– ImportanceOfBeingErnest, Commented Mar 18, 2019 at 11:03

Manuel Montoya · Accepted Answer · 2019-11-16 01:54:20Z

3

I had a similar issue. You probably have solved the problem by now, but anyway I'm posting an answer.

The main point here is that mpld3 works with the fig object used in matplotlib. Like this:

fig, ax = plt.subplots()
ax.plot([1, 2, 3, 4])
html_fig = mpld3.fig_to_html(fig)

So for your solution you should get the figure object from your seaborn plot. It can be done either this way (whatch the ax argument):

fig, ax = plt.subplots()
sns.heatmap(conf_matrix, annot=True, fmt="d", ax=ax)
html_fig = mpld3.fig_to_html(fig)

Or this way:

fig = sns.heatmap(conf_matrix, annot=True, fmt="d").get_figure()
html_fig = mpld3.fig_to_html(fig)

If you want to include seaborn plots and matplotlib in general in django projects using mpld3 I'd recommend to view this question

answered Nov 16, 2019 at 1:54

Manuel Montoya

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