pdb list shows unexpected code when stack frame includes a try / finally block

[AbramClark]

BPO	17191
Nosy	@xdegaye, @serhiy-storchaka
Files	pdb_list_bug_reproduce.py: program to reproduce unexpected pdb behavior

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-05-31.12:51:09.421>
created_at = <Date 2013-02-12.10:47:37.091>
labels = ['type-bug']
title = 'pdb list shows unexpected code when stack frame includes a try / finally block'
updated_at = <Date 2020-05-31.12:51:09.420>
user = 'https://bugs.python.org/AbramClark'

bugs.python.org fields:

activity = <Date 2020-05-31.12:51:09.420>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-31.12:51:09.421>
closer = 'serhiy.storchaka'
components = []
creation = <Date 2013-02-12.10:47:37.091>
creator = 'AbramClark'
dependencies = []
files = ['29047']
hgrepos = []
issue_num = 17191
keywords = []
message_count = 3.0
messages = ['181951', '182270', '370431']
nosy_count = 3.0
nosy_names = ['xdegaye', 'serhiy.storchaka', 'AbramClark']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue17191'
versions = ['Python 2.7']

[AbramClark]

The list command in pdb shows an unexpected portion of code after an up command enters a try / finally block in the call stack.

To reproduce:

pdb pdb_list_bug_reproduce.py
c
up
list

Expected behavior: Show 11 lines around line 8, "throw_something()", which was the entry point to the lower stack frame.

Actual behavior: Shows code centered around line 10, in the finally block, which is likely cleanup code that has nothing to do with the exception thrown.

[xdegaye]

This is fixed in python 3.2 by changeset 670d4cbf1464, and indeed the
'>>' marker is shown at line 8 of pdb_list_bug_reproduce.py when
debugging this (modified for py3) script with python 3.2.

[serhiy-storchaka]

Python 2.7 is no longer supported.