Launching pdb from within a script

[Peter Otten]

Graham Nicholls wrote:

> I'm sure I was able to print the value of variables like this:
> 
>  except :
>         pdb.set_trace()
[...]
> But pdb complains that there are no such variables.  It may be that I had
> to add some incantation around the script startup - I just can't remember
> (and its frustrating!).

<debugger.py>
import pdb
abc = 1
try:
    print "before"
    1/0
except:
    pdb.set_trace()
print "after"
</debugger.py>

Now run it:

before
--Return--
> /(suppressed)/python2.3/pdb.py(992)set_trace()->None
-> Pdb().set_trace()
(Pdb) abc
*** NameError: name 'abc' is not defined
(Pdb) u
> /(suppressed)/debugger.py(7)?()
-> pdb.set_trace()
(Pdb) abc
1
(Pdb)

If the above sample session doesn't help, you could actually read the pdb
documentation - or do something new and dangerous: search google groups
for, say, Nicholls and set_trace :-)

Peter