[Python-Dev] The step command of pdb is broken

[Guido van Rossum]

IT would be good if the author of one of the pdb add-ons such as (I
believe) pdb2 could comment on this bug.

On Mon, Apr 30, 2012 at 3:31 AM, Xavier de Gaye <xdegaye at gmail.com> wrote:
> Issue http://bugs.python.org/issue13183 raises the point that the step
> command of pdb is broken. This issue is 6 months old. A patch and test
> case have been proposed. The 'Lifecycle of a Patch' at
> http://docs.python.org/devguide/patch.html says
> <quote>
> If your patch has not received any notice from reviewers (i.e., no
> comment made) after a substantial amount of time then you may email
> python-dev at python.org asking for someone to take a look at your patch.
> </quote>
> I am the author of pyclewn, a Vim front end to pdb and gdb, and I
> would be grateful for any progress on this issue.
>
> The following pdb session shows the problem when running the three
> modules main.py, foo.py and bar.py. After the second step command, pdb
> does not stop (as it should) at lines foo.py:5 and foo.py:6, nor does
> it stop to print the return value of increment().
> =================================================
> main.py
>     1  import foo
>     2
>     3  result = foo.increment(100)
>     4  print('result', result)
> foo.py
>     1  import bar
>     2
>     3  def increment(arg):
>     4      v =  bar.value()
>     5      result = arg + v
>     6      return result
> bar.py
>     1  def value():
>     2      return 5
> =================================================
> $ python -m pdb main.py
>> /path_to/main.py(1)<module>()
> -> import foo
> (Pdb) import sys; sys.version
> '3.3.0a2+ (default:2c27093fd11f, Apr 30 2012, 10:51:35) \n[GCC 4.3.2]'
> (Pdb) break bar.py:2
> Breakpoint 1 at /path_to/bar.py:2
> (Pdb) continue
>> /path_to/bar.py(2)value()
> -> return 5
> (Pdb) step
> --Return--
>> /path_to/bar.py(2)value()->5
> -> return 5
> (Pdb) step
>> /path_to/main.py(4)<module>()
> -> print('result', result)
> (Pdb)
> =================================================
>
>
> Xavier
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-- 
--Guido van Rossum (python.org/~guido)