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]

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

 

[Russell E. Owen]

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