Web2Py cannot import module matplotlib

[K. Antonis Tzorvas]

I've used this script https://github.com/web2py/web2py/blob/master/scripts/setup-web2py-nginx-uwsgi-ubuntu.sh

and the problem is that i cannot import matplotlib in web2py (although it did import numpy)
if i try to run /home/www-data/web2py/web2py.py on another port then there is no problem with the import and the application is running fine

any idea?
thanks

[Massimo Di Pierro]

Look into this. When you import matplotlib it attempts to read(write?) into the MPLCONFIGDIR. If it does not exist for the user or the user (www-data) does not have read/write permission it fails.

[K. Antonis Tzorvas]

I solved this problem by adding

import os
import tempfile
os.environ['MPLCONFIGDIR'] = tempfile.mkdtemp()

before the import matplotlib and it's running, but i had problems with the plotting due to headless environment i was getting this error from py-Tk:

"no display name and $DISPLAY environment variable"

I Solved this by adding

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

I've seen your scripts for setting up web2py in such a different ways (with or without redmine/postgresql etc) and i liked this logic, i will go and setup a standard development environment in my remote machine/server so to avoid conflicts when uploading the application in a different environment -- if there is any suggestion, it would be more than pleasantly to hear it!

thanks for your great work!

[K. Antonis Tzorvas]

all operations are noticeably very slow, I haven't changed anything from the setup, any idea on what to look for?

with the same app on pythonanywhere, everything runs faster