Am Wed, 12 Sep 2007 02:09:28 +0000 schrieb [EMAIL PROTECTED]:
> I'm running code via the "exec in context" statement within a much
> larger program. What I would like to do is capture any possible
> errors and show a pretty traceback just like the Python interactive
> interpreter does, but only show the part of the traceback relating to
> the code sent to exec.
>
> For example here is the code I'm using:
>
> try:
> exec code
> except Exception,Err:
> traceback.print_exc()
>
> Which gives me something like this when it catches an exception:
>
> Traceback (most recent call last):
> File "/....py", line 843, in run
> semi_safe_exec.safe_eval(code.replace('\r',''),context,5)
> File ".....py", line 400, in safe_eval
> exec_timed(code, context, timeout_secs)
> File ".....py", line 353, in exec_timed
> exec code in context
> File "<string>", line 7, in ?
> File "<string>", line 5, in func2
> File "<string>", line 2, in func1
> ZeroDivisionError: integer division or modulo by zero
>
> What I want to print instead is just something like:
>
> Traceback (most recent call last):
> File "<string>", line 7, in ?
> File "<string>", line 5, in func2
> File "<string>", line 2, in func1
> ZeroDivisionError: integer division or modulo by zero
>
> Thanks in advance for the help.
>
> -Greg
>
> P.S. if it matters, for this example, code in exec code is:
>
> def func1():
> print 7/0
>
> def func2():
> func1()
>
> func2()
Your assessment is wrong. You only get the extra lines in the traceback if
you don't immediately wrap the exec statement in a try ... except block:
$ cat snip_traceback1.py
import traceback
def alpha():
try:
beta()
except Exception, e:
traceback.print_exc()
def beta():
gamma()
def gamma():
exec s in {}
s = """
def delta():
epsilon()
def epsilon():
1/0
delta()
"""
if __name__ == "__main__":
alpha()
$ python snip_traceback1.py
Traceback (most recent call last):
File "snip_traceback1.py", line 5, in alpha
beta()
File "snip_traceback1.py", line 10, in beta
gamma()
File "snip_traceback1.py", line 13, in gamma
exec s in {}
File "<string>", line 7, in <module>
File "<string>", line 3, in delta
File "<string>", line 6, in epsilon
ZeroDivisionError: integer division or modulo by zero
So the first step is to move the try ... except closer to the exec:
$ cat snip_traceback2.py
import traceback
def alpha():
beta()
def beta():
gamma()
def gamma():
try:
exec s in {}
except Exception, e:
traceback.print_exc()
s = """
def delta():
epsilon()
def epsilon():
1/0
delta()
"""
if __name__ == "__main__":
alpha()
$ python snip_traceback2.py
Traceback (most recent call last):
File "snip_traceback2.py", line 11, in gamma
exec s in {}
File "<string>", line 7, in <module>
File "<string>", line 3, in delta
File "<string>", line 6, in epsilon
ZeroDivisionError: integer division or modulo by zero
You are almost there. Now let's strip off the outermost traceback:
$ cat snip_traceback3.py
import sys
import traceback
def alpha():
beta()
def beta():
gamma()
def gamma():
try:
exec s in {}
except Exception, e:
etype, value, tb = sys.exc_info()
traceback.print_exception(etype, value, tb.tb_next)
s = """
def delta():
epsilon()
def epsilon():
1/0
delta()
"""
if __name__ == "__main__":
alpha()
$ python snip_traceback3.py
Traceback (most recent call last):
File "<string>", line 7, in <module>
File "<string>", line 3, in delta
File "<string>", line 6, in epsilon
ZeroDivisionError: integer division or modulo by zero
Heureka.
Peter
--
http://mail.python.org/mailman/listinfo/python-list
