Passing a matplotlib figure to HTML (flask)

Question

I am using matplotlib to render some figure in a web app. I\'ve used fig.savefig() before when I\'m just running scripts. However, I need a function to return a

Answer 1

For Python3 ....

I have a DataFrame, I want to show this plot in Flask ....

So Create a Base64 Image of the plot.

    df_week_min_az = pd.DataFrame.from_dict(week_max_az.to_dict(),
                                            orient='index', columns=['min_az'])



    sunalt = df_week_max_angle.plot().get_figure()
    buf = io.BytesIO()
    sunalt.savefig(buf, format='png')
    buf.seek(0)
    buffer = b''.join(buf)
    b2 = base64.b64encode(buffer)
    sunalt2=b2.decode('utf-8')

I now call my template using the base64 encoded data like this....

return render_template('where.html', form=form, sunalt=sunalt2)

The relevant part of the template (i.e. the picture bit) looks like this....

 {% if sunalt != None %}

      
Sun Altitude during the year
    
{% endif %}

Hope that helps someone....