Function call arguments in stack trace?

Tue Jun 7 22:45:15 EDT 2011

En 2011年6月07日 15:09:54 -0300, Dun Peal <dunpealer at gmail.com> 
escribió:
> In a stack trace, is it possible to somehow get the arguments with
> which each function was called?
>> So for example, if function `foo` in module `bar` was called with
> arguments `(1, [2])` when it raised an exception, then instead of:
>> Traceback (most recent call last):
> File "bar.py", line 123, in foo
> build_rpms()
>> The stack trace would read:
>> Traceback (most recent call last):
> File "bar.py", line 123, in foo(1, [2])
> build_rpms()
>> This would save a lot of debugging time!

The cgitb module does exactly that; some third-party modules offer similar 
functionality, but I don't remember any names.
Despite its name, cgitb works with any script.
Given this test script:
# begin test_traceback.py
import cgitb
cgitb.enable(format="text")
spam = []
def a(x, y):
 "This is function a"
 z = x+y
 return b(z)
def b(z, n=3):
 """This is function b.
 Its docstring is longer."""
 if n!=3:
 just(to_consume_space)
 w = c(foo=z*n)
 return w
def c(foo=0, bar=1):
 "This is function c"
 baz = foo+bar
 spam.somenamethatdoesnotexist(foo+bar)
 anotherglobal("thatdoesnotexisteither")
a(10, 20)
# end test_traceback.py
the output is:
AttributeError
Python 3.2: d:\apps\Python32\python.exe
Tue Jun 7 23:36:36 2011
A problem occurred in a Python script. Here is the sequence of
function calls leading up to the error, in the order they occurred.
 D:\TEMP\test_traceback.py in <module>()
 27 baz = foo+bar
 28 spam.somenamethatdoesnotexist(foo+bar)
 29 anotherglobal("thatdoesnotexisteither")
 30
 31 a(10, 20)
a = <function a>
 D:\TEMP\test_traceback.py in a(x=10, y=20)
 7 "This is function a"
 8 z = x+y
 9 return b(z)
 10
 11
global b = <function b>
z = 30
 D:\TEMP\test_traceback.py in b(z=30, n=3)
 18 just(to_consume_space)
 19
 20 w = c(foo=z*n)
 21
 22 return w
w undefined
global c = <function c>
foo undefined
z = 30
n = 3
 D:\TEMP\test_traceback.py in c(foo=90, bar=1)
 26 "This is function c"
 27 baz = foo+bar
 28 spam.somenamethatdoesnotexist(foo+bar)
 29 anotherglobal("thatdoesnotexisteither")
 30
global spam = []
spam.somenamethatdoesnotexist undefined
foo = 90
bar = 1
AttributeError: 'list' object has no attribute 'somenamethatdoesnotexist'
 [... exception attributes ...]
 [... original traceback ...]
-- 
Gabriel Genellina