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

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

Hello John,

On Mon, Nov 22, 2004 at 04:50:10PM -0600, John Hunter wrote:
> So what is the canonical way to funnel exceptions into GUI dialog
> boxes?  Isn't this what sys.except_hook is for?
I think we should somehow explicitely catch all exceptions
we are expecting (maybe near the main loop) and the exception handler
could feed them to the backend.

Reasons:

1) This looks like the most Pythonic solution to me: exceptions
  are ment to by caught by "try: ... except: ..." statements

2) This might open a way to differentiate between expected exections
  (opening a file with a user-supplied file name might fail, if the
  user mistyped the name -> User should be told and asked for another
  file name) and unexpected ones which indicate programming errors.

3) Easier to understand flow of control.  If you follow a chain of callers
  through the source code you can see which exections are caught at which
  place, whereas the except_hook mechanism is more "magical".

What do you think?

Jochen
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