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Re: Python pdb bug, followed by bug in bugs.python.org

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From Robert Kern <robert.kern@gmail.com>
Subject Re: Python pdb bug, followed by bug in bugs.python.org
Date Fri, 12 Apr 2013 00:12:50 +0530
References <a34e8251-85df-4486-b5a1-72eb2bb9f353@googlegroups.com> <kk1tfh$1st$1@reader1.panix.com> <b06d47b6-9ecf-44a3-bea2-20994dd0f1f4@googlegroups.com> <CALwzidnmvOCgX+0Vgk+iEOGwYX2QiJkR=-Wo_wDMbcFmFmWevA@mail.gmail.com>
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On 2013-04-11 23:11, Ian Kelly wrote:
> On Thu, Apr 11, 2013 at 8:56 AM,  <donaldcallen@gmail.com> wrote:
>> #! /usr/bin/env python3
>> import pdb
>> def foo(message):
>>          print(message)
>>          pdb.set_trace()
>> foo('first call')
>> foo('second call')
>>
>> Stick this in an file with execute permission and run it. At the first breakpoint, the backtrace will be correct. Continue. At the second breakpoint, a backtrace will show the foo('first call') on the stack when, in fact, the call came from foo('second call'), as verified by the printed message.
>
>
> This is what I get using Python 3.3.1 in Windows:
>
> C:\Users\ikelly\Desktop>c:\python33\python python_bug.py
> first call
> --Return--
>> c:\users\ikelly\desktop\python_bug.py(7)foo()->None
> -> pdb.set_trace()
> (Pdb) c
> second call
> --Return--
>> c:\users\ikelly\desktop\python_bug.py(7)foo()->None
> -> pdb.set_trace()
> (Pdb) c

Use `where` to see the problem:

[~/scratch]$ python3.3 pdbbug.py
first call
--Return--
 > /Users/rkern/scratch/pdbbug.py(4)foo()->None
-> pdb.set_trace()
(Pdb) where
   /Users/rkern/scratch/pdbbug.py(5)<module>()
-> foo('first call')
 > /Users/rkern/scratch/pdbbug.py(4)foo()->None
-> pdb.set_trace()
(Pdb) c
second call
--Return--
 > /Users/rkern/scratch/pdbbug.py(4)foo()->None
-> pdb.set_trace()
(Pdb) where
   /Users/rkern/scratch/pdbbug.py(5)<module>()
-> foo('first call')
 > /Users/rkern/scratch/pdbbug.py(4)foo()->None
-> pdb.set_trace()
(Pdb)

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco

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Thread

Python pdb bug, followed by bug in bugs.python.org donaldcallen@gmail.com - 2013-04-09 08:25 -0700
  Re: Python pdb bug, followed by bug in bugs.python.org Arnaud Delobelle <arnodel@gmail.com> - 2013-04-09 21:03 +0100
  Re: Python pdb bug, followed by bug in bugs.python.org John Gordon <gordon@panix.com> - 2013-04-09 20:25 +0000
    Re: Python pdb bug, followed by bug in bugs.python.org donaldcallen@gmail.com - 2013-04-11 07:56 -0700
      Re: Python pdb bug, followed by bug in bugs.python.org Ian Kelly <ian.g.kelly@gmail.com> - 2013-04-11 11:41 -0600
      Re: Python pdb bug, followed by bug in bugs.python.org Robert Kern <robert.kern@gmail.com> - 2013-04-12 00:12 +0530
      Re: Python pdb bug, followed by bug in bugs.python.org Ian Kelly <ian.g.kelly@gmail.com> - 2013-04-11 12:55 -0600
  Re: Python pdb bug, followed by bug in bugs.python.org Ned Deily <nad@acm.org> - 2013-04-09 15:17 -0700
    Re: Python pdb bug, followed by bug in bugs.python.org Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-04-11 10:50 +1200
      Re: Python pdb bug, followed by bug in bugs.python.org Ned Deily <nad@acm.org> - 2013-04-10 23:39 -0700
    Re: Python pdb bug, followed by bug in bugs.python.org donaldcallen@gmail.com - 2013-04-11 08:12 -0700
      Re: Python pdb bug, followed by bug in bugs.python.org Piotr Dobrogost <p@google-groups-2013.dobrogost.net> - 2013-04-13 10:28 -0700
        Re: Python pdb bug, followed by bug in bugs.python.org Ned Deily <nad@acm.org> - 2013-04-13 11:11 -0700
      Re: Python pdb bug, followed by bug in bugs.python.org Piotr Dobrogost <p@google-groups-2013.dobrogost.net> - 2013-04-13 10:28 -0700
    Re: Python pdb bug, followed by bug in bugs.python.org donaldcallen@gmail.com - 2013-04-11 08:12 -0700

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