Line numbers reported by extract_stack are offset by the #-*- encoding line

[ddvoinikov]

BPO	2832
Nosy	@pitrou, @vstinner
Superseder	bpo-2384: [Py3k] line number is wrong after encoding declaration

^{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 2008-09-27.15:32:44.358>
created_at = <Date 2008-05-12.04:52:03.637>
labels = ['type-bug', 'library']
title = 'Line numbers reported by extract_stack are offset by the #-*- encoding line'
updated_at = <Date 2008-09-27.15:32:44.358>
user = 'https://bugs.python.org/ddvoinikov'

bugs.python.org fields:

activity = <Date 2008-09-27.15:32:44.358>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2008-09-27.15:32:44.358>
closer = 'benjamin.peterson'
components = ['Library (Lib)']
creation = <Date 2008-05-12.04:52:03.637>
creator = 'ddvoinikov'
dependencies = []
files = []
hgrepos = []
issue_num = 2832
keywords = []
message_count = 2.0
messages = ['66708', '73927']
nosy_count = 3.0
nosy_names = ['pitrou', 'vstinner', 'ddvoinikov']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '2384'
type = 'behavior'
url = 'https://bugs.python.org/issue2832'
versions = ['Python 3.0']

[ddvoinikov]

Stack trace information extracted with traceback.extract_stack is
incorrect in that the #-*- line causes double counting. For example:

#comment
from traceback import extract_stack
print("this is line", extract_stack()[-1][1])

prints 'this is line 3', but

#comment
#-*- coding: windows-1251 -*-
from traceback import extract_stack
print("this is line", extract_stack()[-1][1])

prints 'this is line 6'

[vstinner]

This bug is a duplicate of the bpo-2384: I tried your example with
the patch tokenizer-coding-2.patch and your bug is fixed:

• first example (no coding): this is line 3
• second example (with coding): this is line 4