Problems with saving figure from within mod_python script

I have searched the web for a solution to the following problem and nothing
works.

I call matplotlib code from a python script (2.5) running on Apache2.2 and
mod_python. When I get to the point where I the code is to save a figure in
the website dir I get the following error.

File "/usr/lib/python2.5/site-packages/matplotlib/__init__.py", line 324, in
_get_configdir
    raise RuntimeError("'%s' is not a writable dir; you must set environment
variable HOME to be a writable dir "%h)

RuntimeError: '/root' is not a writable dir; you must set environment
variable HOME to be a writable dir

The code that creates the fig is a follows:

import matplotlib
from matplotlib import pylab as plt
import numpy as np

matplotlib.use('AGG') # use a nongui backend
matplotlib.rdParams['MPLCONFIGDIR']='/var/www/modtest/'
...
plot code here
...

plt.savefig('/var/www/modtest/plot_data/' + plotfile[0]) # use 1st
generated random file name

First can anyone tell me what "HOME" variable the error message is referring
to?
I have changed the $HOME env variable under linux Ubuntu Gutsy
I have added a $HOME variable to httpd.conf, however I am not an
experienced Apache user
I can get the code to work from the interactive.py shell

rlp

···

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I think the error is raised when you try to import matplotlib (not
when you try to save your figure)
matplotlib needs its config directory writable.
It first try MPLCONFIGDIR env. variable, then try $HOME/.matplotlib.
Here, the $HOME is the home directory of the user executing the script.
I think it would be better to set MPLCONFIGDIR env. variable (it
should be env. variable, not rcparams) instead of HOME.
The directory referred by MPLCONFIGDIR must exist.
Unfortunately, I'm not an expert on apache and I can't tell you which
is the best way to set the env. variable.

-JJ

···

On Fri, Feb 20, 2009 at 4:50 PM, bpklmd <rphelps@...2497...> wrote:

I have searched the web for a solution to the following problem and nothing
works.

I call matplotlib code from a python script (2.5) running on Apache2.2 and
mod_python. When I get to the point where I the code is to save a figure in
the website dir I get the following error.

File "/usr/lib/python2.5/site-packages/matplotlib/__init__.py", line 324, in
_get_configdir
   raise RuntimeError("'%s' is not a writable dir; you must set environment
variable HOME to be a writable dir "%h)

RuntimeError: '/root' is not a writable dir; you must set environment
variable HOME to be a writable dir

The code that creates the fig is a follows:

import matplotlib
from matplotlib import pylab as plt
import numpy as np

matplotlib.use('AGG') # use a nongui backend
matplotlib.rdParams['MPLCONFIGDIR']='/var/www/modtest/'
...
plot code here
...

plt.savefig('/var/www/modtest/plot_data/' + plotfile[0]) # use 1st
generated random file name

First can anyone tell me what "HOME" variable the error message is referring
to?
I have changed the $HOME env variable under linux Ubuntu Gutsy
I have added a $HOME variable to httpd.conf, however I am not an
experienced Apache user
I can get the code to work from the interactive.py shell

rlp
--
View this message in context: http://www.nabble.com/Problems-with-saving-figure-from-within-mod_python-script-tp22129192p22129192.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

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