I'm trying to use matplotlib with mod_wsgi. I'm getting 500 errors the
first time the page loads but it displays correctly if you refresh the
page immediately. If I then wait for a while and refresh again it
gives a 500 error again. Seems like it has something to do with the
way mod_wsgi loads things. Any ideas?
Here are the versions I'm using:
Apache 2.2.14 (worker MPM)
mod_wsgi 2.8
Python 2.6.5
matplotlib 0.99.1.2
Here is the error that occurs in my Apache logs:
mod_wsgi (pid=1530): Target WSGI script '/home/user/graph.wsgi' cannot
be loaded as Python module.
mod_wsgi (pid=1530): Exception occurred processing WSGI script '/home/
user/graph.wsgi'.
Traceback (most recent call last):
File "/home/user/graph.wsgi", line 6, in <module>
from matplotlib.backends.backend_agg import FigureCanvasAgg
File "/usr/lib/pymodules/python2.6/matplotlib/backends/
backend_agg.py", line 28, in <module>
from matplotlib.backend_bases import RendererBase,\\
File "/usr/lib/pymodules/python2.6/matplotlib/backend_bases.py",
line 29, in <module>
import matplotlib.cbook as cbook
AttributeError: 'module' object has no attribute 'cbook'
Here is the source of graph.wsgi:
import os
os.environ['HOME'] = '/tmp'
import StringIO
from matplotlib.backends.backend_agg import FigureCanvasAgg
from matplotlib.figure import Figure
def application(environ, start_response):
output = StringIO.StringIO()
fig = Figure()
canvas = FigureCanvasAgg(fig)
ax = fig.add_subplot(111)
ax.plot(range(5), range(5))
canvas.print_figure(output)
start_response('200 OK', [('Content-type', 'image/png'), ('Content-
Length', str(output.tell()))])
return [output.getvalue()]
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