Re: [matplotlib-devel] gtk backend silently ignores all exceptions

[Eric F. <ef...@ha...>]

John Hunter wrote:
> On Mon, Jan 26, 2009 at 6:02 PM, Jae-Joon Lee <lee...@gm...> wrote:
>> Michael,
>>
>> It seems that the gtk backend in the current svn silently ignores ALL
>> exceptions raised during the drawing.
>>
>> http://matplotlib.svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/lib/matplotlib/backends/backend_gtk.py?r1=6696&r2=6793
>>
>> Is this necessary? I don't think we want to do this.
> 
> No, it is a bug.  Catching blanket exceptions and ignoring them is
> never OK -- we need to add a section to the coding guide to this
> effect.  If absolutely necessary, one can catch blanket exceptions and
> log them, eg using cbook.exception_to_str, but they must be reported.
> Michael has already fixed this (perhaps it was some detritus left in
> from a debugging session?) and I'll make a note in the developer docs
> coding guide.

John,

Not quite "always": I think that for something like cbook.is_string_like 
we actually *do* want to silently catch all exceptions.  The problem is 
that if you know nothing about the type of object that you might have to 
deal with, you have no way of knowing what exception it might raise.  We 
ran into an example of this recently.

Eric

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