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Using Matplotlib In Gae

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My tags and title quite clearly state my problem. I want to use matplotlib to create real-time plots in Google App Engine. I've read the documentation and searched on SO and Google

Solution 1:

I'm not familiar with sys module. To give an answer to the question I prefer using webapp2. This is a working handler:

import webapp2
import StringIO
import numpy as np
import matplotlib.pyplot as plt


classMainPage(webapp2.RequestHandler):
    defget(self):
        plt.plot(np.random.random((20)))
        sio = StringIO.StringIO()
        plt.savefig(sio, format="png")
        img_b64 = sio.getvalue().encode("base64").strip()
        plt.clf()
        sio.close()
        self.response.write("""<html><body>""")
        self.response.write("<img src='data:image/png;base64,%s'/>" % img_b64)
        self.response.write("""</body> </html>""")

app = webapp2.WSGIApplication([('/', MainPage)], debug=True)

Alternatively, you could write the sio.getvalue() in the blobstore with files api and use the method get_serving_url() of images api for avoid to encode in base64.

Solution 2:

The problem was that you were setting the MATPLOTLIBDATA and MPLCONFIGDIR environment variables to your app directory before importing matplotlib. Since you didn't have any fonts in your app directory, it couldn't load any fonts.

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