How to store an image in a variable

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Have you tried cStringIO or an equivalent?

import os
import sys
import matplotlib
import matplotlib.pyplot as plt
import StringIO
import urllib, base64

plt.plot(range(10, 20))
fig = plt.gcf()

imgdata = StringIO.StringIO()
fig.savefig(imgdata, format="png")
imgdata.seek(0)  # rewind the data

print "Content-type: image/png\n"
uri = 'data:image/png;base64,' + urllib.quote(base64.b64encode(imgdata.buf))
print '<img src = "https://stackoverflow.com/questions/5314707/%s"/>' % uri

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