It looks like it isn't finding the Computer Modern Bakoma fonts.  They 
don't seem to be included in the Fedora Package (see here: 
http://koji.fedoraproject.org/koji/buildinfo?buildID=230966) and the 
package does not depend on those fonts.  Some of them are packaged in 
the lyx-fonts package, so installing that may help.  But basically this 
is a packaging bug -- the package should either include the fonts or 
depend on the fonts.  It might be a good idea to file a bug against the 
python-matplotlib package in the Fedora bug tracker.

Mike

On 08/15/2011 07:05 AM, Neal Becker wrote:
> Fedora f15.  What am I missing that causes this?
>
> /usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1242: 
> UserWarning:
> findfont: Font family ['cmb10'] not found. Falling back to Bitstream Vera Sans
>    (prop.get_family(), self.defaultFamily[fontext]))
> /usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1252: 
> UserWarning:
> findfont: Could not match :family=Bitstream Vera
> Sans:style=normal:variant=normal:weight=normal:stretch=normal:size=12. 
> Returning
> /usr/share/fonts/texlive-gfsdidot/GFSDidotBold.otf
>    UserWarning)
> /usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1242: 
> UserWarning:
> findfont: Font family ['cmtt10'] not found. Falling back to Bitstream Vera 
> Sans
>    (prop.get_family(), self.defaultFamily[fontext]))
> /usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1242: 
> UserWarning:
> findfont: Font family ['cmss10'] not found. Falling back to Bitstream Vera 
> Sans
>    (prop.get_family(), self.defaultFamily[fontext]))
>
>
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