Re: [matplotlib-devel] propagation of error messages in matplotlib

[Jochen V. <vo...@se...>]

Hello,

On Fri, Nov 19, 2004 at 10:33:43AM -0600, John Hunter wrote:
> >>>>> "Jochen" =3D=3D Jochen Voss <vo...@se...> writes:
>     Jochen> Slight problem: it might now be a little bit more
>     Jochen> difficult to include the name of the file which could not
>     Jochen> be opened in the error message.  The IOError exception
>     Jochen> will probably only have "permission denied" associated
>     Jochen> with it.
>=20
> Looks OK, at least on linux
>=20
>=20
> >>> file('/sbin/ldconfig', 'w')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> IOError: [Errno 13] Permission denied: '/sbin/ldconfig'

But sometimes it doesn't give the file name:

    >>> from matplotlib.matlab import *
    >>> plot([1,2,3],[2,3,1])
    [<matplotlib.lines.Line2D instance at 0x41ef774c>]
    >>> savefig("/forbidden.png")
    Traceback (most recent call last):
      File "<stdin>", line 1, in ?
      File ".../matlab.py", line 1009, in savefig
        manager.canvas.print_figure(*args, **kwargs)
      File ".../backends/backend_gtkagg.py", line 69, in print_figure
        agg.print_figure(filename, dpi, facecolor, edgecolor, orientation)
      File ".../backends/backend_agg.py", line 379, in print_figure
        self.renderer._renderer.write_png(str(filename))
    RuntimeError: could not open file

I did not investigate what happens here, but if there is an easy way to
get the file name into the exception we should probably use it.

All the best,
Jochen
--=20
http://seehuhn.de/