Ben Weaver wrote:
> Hi,
>
> Is there any way to "splice" a decorator out of an exception stack
> trace? For example:
>
>>>> def decorator(proc):
> ... def internal(*args, **kwargs):
> ... return proc(*args, **kwargs)
> ... return internal
>
>>>> @decorator
> ... def foo():
> ... assert False, 'simulate failure'
>
>>>> foo()
> Traceback (most recent call last):
> ...
> File "<...>", line 1, in <module>
> File "<...>", line 3, in internal
> File "<...>", line 3, in foo
> AssertionError: simulate failure
>
> I would like to know if it's possible to somehow end up with this
> stack trace instead:
>
> File "<...>", line 1, in <module>
> File "<...>", line 3, in foo
It is possible, but not a good idea. You are misleading developers hunting
for bugs.
import sys
def crash():
1/0
def deco(f):
def g(*args, **kw):
try:
print "entering f%s" % (args,)
f(*args, **kw)
except:
v, t, tb = sys.exc_info()
raise v, None, tb.tb_next
return g
@deco
def f(n):
if n:
f(n-1)
else:
crash()
f(5)
Ouput:
$ python doctored_traceback.py
entering f(5,)
entering f(4,)
entering f(3,)
entering f(2,)
entering f(1,)
entering f(0,)
Traceback (most recent call last):
File "doctored_traceback.py", line 24, in <module>
f(5)
File "doctored_traceback.py", line 19, in f
f(n-1)
File "doctored_traceback.py", line 19, in f
f(n-1)
File "doctored_traceback.py", line 19, in f
f(n-1)
File "doctored_traceback.py", line 19, in f
f(n-1)
File "doctored_traceback.py", line 19, in f
f(n-1)
File "doctored_traceback.py", line 21, in f
crash()
File "doctored_traceback.py", line 4, in crash
1/0
ZeroDivisionError
Peter
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