[Matplotlib-users] savefig and StringIO error on Python3

SourceForge Headquarters 1320 Columbia Street Suite 310 San Diego, CA 92101 +1 (858) 422-6466

Dear all,

I'm trying to write a html page content in which a png figure is generated
by matplotlib, with Python3.

However, the following piece of code does not work with matplotlib/Python3
(while it should work with Python2). The error is the following on

TypeError: string argument expected, got 'bytes'

when on fig.savefig(sio, format="png")

Could someone explain me how to do it ?

Best regards,

Julien

--------------------------------------------

import matplotlib.pyplot as plt

from io import StringIO

 fig = plt.figure()

ax = fig.add_subplot(111)

ax.plot([1,2,3])

sio = StringIO()

fig.savefig(sio, format="png")

html = """<html><body>

...a bunch of text and html here...

<img src="data:image/png;base64,%s"/>

...more text and html...

</body></html>""" % sio.getvalue().strip()