[mod_python] Matplotlib error from a mod_python script "root is not a writable dir... "

David Zaslavsky diazona at gmail.com
Sat Feb 21 19:16:02 EST 2009

Why not give matplotlib an absolute path?  You could get the document
root from mod_python and os.path.join() it to the subdirectory you
want to save to.

Whenever I've written scripts that save figures with matplotlib, I
always specify absolute paths and I've never had a problem.

:) David

On Sat, Feb 21, 2009 at 6:12 PM, Ron Phelps <rphelps at redshift.com> wrote:
> I have successfully configured mod_python and using some python scripts
> am accessing a database for the purpose of generating plots using
> matplotlib.
> The problem is that when I try to save a plot to a subdir of the Apache
> document root I get the following error.
> '/root' is not a writable dir; you must set the environment variable
> HOME to be a writable dir
> echo $HOME  returns '/root' but setting it to the correct path and even
> changing the dir permissions does no good.
> Tried useing the MPLCONFIGDIR to point to a MATPLOTLIBRC file but no
> luck there either.
> Does anyone know What HOME variable is this error message referring to?
> BTW Graham, I came across your article on "modwsgi" though it may not be
> directly related I will read it in hopes it gives me some insight.
> All help appreciated.
> Thanks
> Ron
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