Matplotlib - python does not find pylab

[Pau]

Hello,

I have many python scripts to plot graphs.

I have now done a clean OpenBSD install (-current) on a thinkpad x200s.

hux(p8)| uname -a
OpenBSD hux 4.5 GENERIC#1748 i386

I have installed py-matplotlib and python.

My scripts start like this:

-------------------------------------
#!/usr/bin/env python
"""
some comment
"""

from pylab import *

# Create arrays
X     = load ( './BinaryData_0.dat')
etc etc
-------------------------------------

I have done thousands of plots with this scheme.

But now, when I try to execute the script, I get

Traceback (most recent call last):
  File "./KozaiEccSemi.py", line 11, in ?
    from pylab import *
ImportError: No module named pylab

This is Python 2.5.4, on zsh but I have tried to both change the
python version and to use a different shell, with default config file
(my zshrc is complicated)

The error output is always the same.

Any help will be appreciated.

Pau