can't print the exception cause/context in Python3.0?

[BigHand]

On Mar 9, 9:02 am, BigHand <hewei... at gmail.com> wrote:
> On Mar 8, 9:49 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>
>
>
> > En Sat, 07 Mar 2009 21:18:22 -0200, BigHand <hewei... at gmail.com> escribió:
>
> > > On 3月7日, 下午11时21分, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>  
> > > wrote:
> > >> En Sat, 07 Mar 2009 11:46:08 -0200, BigHand <hewei... at gmail.com>  
> > >> escribió:
>
> > >> > I want the exception printted like this:
> > >> >   File "<pyshell#14>", line 2, in <module>  "a()"
> > >> >   File "<pyshell#6>", line 2, in a        "b()"
> > >> >   File "<pyshell#9>", line 2, in b       "return tuple()[0]"
>
> > >> Put your code in a true module stored in a file, so the source lines  
> > >> can  
> > >> be retrieved.
> > >     I don't understand you.could you give me more details?
>
> > C:\TEMP>type tbtest.py
> > import sys
> > import traceback
>
> > def a(): b()
>
> > def b(): raise ValueError
>
> > print("\none\n")
> > try: a()
> > except:
> >    exc_typ, exc_val, exc_tb = sys.exc_info()
> >    traceback.print_tb(exc_tb)
>
> > print("\ntwo\n")
> > try: a()
> > except:
> >    exc_typ, exc_val, exc_tb = sys.exc_info()
> > traceback.print_tb(exc_tb)
>
> > print("\nthree\n")
> > a()
>
> > C:\TEMP>python30 tbtest.py
>
> > one
>
> >    File "tbtest.py", line 9, in <module>
> >      try: a()
> >    File "tbtest.py", line 4, in a
> >      def a(): b()
> >    File "tbtest.py", line 6, in b
> >      def b(): raise ValueError
>
> > two
>
> >    File "tbtest.py", line 15, in <module>
> >      try: a()
> >    File "tbtest.py", line 4, in a
> >      def a(): b()
> >    File "tbtest.py", line 6, in b
> >      def b(): raise ValueError
>
> > three
>
> > Traceback (most recent call last):
> >    File "tbtest.py", line 21, in <module>
> >      a()
> >    File "tbtest.py", line 4, in a
> >      def a(): b()
> >    File "tbtest.py", line 6, in b
> >      def b(): raise ValueError
> > ValueError
>
> > C:\TEMP>
>
> > --
> > Gabriel Genellina
>
> hello.Gabriel,
> thanks very much!
>
> My another issue is that, I have an embedded python3.0 in my MFC app,
> use the PyRun_File to execute the Py script file, and call the python
> function traceback.print_tb to print the traceback info,
>
> but I can't get souce showed in the traceback.

solve it.
I need to "import traceback" first in the script file. or I can't get
the source retrieved later.