tkinter shell problem

[Philippe C. Martin]

Hi,

I have the following problem:

I wrote a tkinter shell which on a key return event first evals the input
buffer (in a try: except:) and then, in case of except, execs the input
buffer.
I have the problem if the exec fails:

If I trap it, I do not get the stack dump that I which I would show.

ex:

% import dontexist

Traceback (most recent call last):
File "<pyshell#3>", line 1, in -toplevel-
import dontexist
ImportError: No module named dontexist
If I don"t trap it, then my clean up code which is after the exec obviously
does not get called (i.e, clear my input buffer, save the history, print a
prompt .......)

Yet Idle manages - any clue ?
Regards,

Philippe

[Eric Brunel]

Philippe C. Martin wrote:

Hi,

I have the following problem:

I wrote a tkinter shell which on a key return event first evals the input
buffer (in a try: except:) and then, in case of except, execs the input
buffer.
I have the problem if the exec fails:

If I trap it, I do not get the stack dump that I which I would show.

Why? When catching an exception, you can get the exception type, the exception
itself and the traceback object via the sys.exc_info() function. You can then
use the traceback module to format the traceback just as Python would print it
if the exception went to the top-most level.

HTH
--
- Eric Brunel <eric (underscore) brunel (at) despammed (dot) com> -
PragmaDev : Real Time Software Development Tools - http://www.pragmadev.com

[Russell E. Owen]

In article <ma**************************************@python.o rg>,
"Philippe C. Martin" <ph*************@sbcglobal.net> wrote:

Hi,

I have the following problem:...
If I trap (an exception), I do not get the stack dump that I which I would show.
...
If I don"t trap it, then my clean up code...does not get called...

Yet Idle manages - any clue ?

Use the traceback module. For example:

try:
...code to protect...
except (SystemExit, KeyboardInterrupt):
raise
except Exception, e:
traceback.print_exc(file=sys.stderr)
....code to handle exception...

if you are sure none of your code can raise error exceptions that
inherit directly from Exception, you can simplify this to one except:
except StandardError, e:
Unfortunately, some common modules (including Tkinter) raise exceptions
that inherit from Exception, not StandardError.

-- Russell