Hi,
Sorry i have ever post this message in the support section of matplotlib.sourceforge.net Maybe it was bad.
I try another time here 
I have Python 2.3
Pygtk 2.4.1
gtk runtime environnement 2.6.2 rc1
I tryied with every version of Matplotlib since 0.63. Same error is happening: ImportError: cannot import name POLAR.
I decided to edit files:
- C:\Python23\Lib\site-packages\matplotlib\axes.py
l.36 put , NonSeparableTransformation in comment
l.37 put ,Polar in comment
- C:\Python23\Lib\site-packages\matplotlib\transforms.py
l.189 put ,Polar in comment
l.190 put , NonSeparableTransformation in comment
After that, it works well.
But i have no idea why this problem happened.
A colleague of mine hadn't to do it and it works perfectly.
Does someone have any idea?
Thanks,
Philippe
Here is the excecution of the python program with --verbose-helpful option
C:\>python "C:\Documents and Settings\cyril_2\Bureau\simple_plot.py" --verbose-h
elpful
matplotlib data path C:\Python23\share\matplotlib
loaded rc file C:\Python23\share\matplotlib\.matplotlibrc
matplotlib version 0.72
verbose.level helpful
interactive is True
platform is win32
numerix numarray 1.0
Traceback (most recent call last):
  File "C:\Documents and Settings\cyril_2\Bureau\simple_plot.py", line 3, in ?
    from pylab import *
  File "C:\Python23\Lib\site-packages\pylab.py", line 1, in ?
    from matplotlib.pylab import *
  File "C:\Python23\Lib\site-packages\matplotlib\pylab.py", line 191, in ?
    from axes import Axes, PolarAxes
  File "C:\Python23\Lib\site-packages\matplotlib\axes.py", line 12, in ?