Re: [Matplotlib-users] Question to OO matplotlub tutorial

[John H. <jdh...@ac...>]

>>>>> "Florian" == Florian Lindner <mai...@xg...> writes:

    Florian> Am Freitag, 13. Mai 2005 18:49 schrieb John Hunter:
    >> >>>>> "Florian" == Florian Lindner <mai...@xg...>
    >> writes:
    >> 
    Florian> No.  I pasted the complete script into the mail. There is
    Florian> nothing else I execute...
    >>  Please post the following commands, or their equivalent for
    >> your platform, and their output.  Please include the commands
    >> you actually type in your post.
    >> 
    >> > cat test.py > /usr/bin/python2.4 ./test.py --verbose-helpful

    Florian> Here we go:

Well, I'll be damned.  I really can't believe this hasn't cropped up
before -- it's a real bug.

The errant code is in matplotlib/backends/__init___.py

# Import the requested backend into a generic module object
backend_name = 'backend_'+backend.lower()
backend_mod = __import__('matplotlib.backends.'+backend_name,
                         globals(),locals(),[backend_name])

Where the default backend is being imported.  These changes were
introduced many moons ago by Fernando when he was cleaning up the
backend import for ipython/pylab.  Then need top be moved to a
function or otherwise deferred until pylab asks for them, to prevent
the kind of problem you are seeing.

As a workaround, add these two lines at the top of your script:

import matplotlib
matplotlib.use('Agg')

or change the default backend in the rc file to 'Agg'. Even though
there are 2 good workarounds, I still consider this to be a little bug,
because the OO interface shouldn't be doing any magic like importing a
backend implicitly.  Would you be willing to file a bug report on the
sourceforge site?

Thanks,
JDH