[issue38283] sys._getframe(1).f_lineno changed behavior in 3.8

[Thomas Haller]

New submission from Thomas Haller <thom311 at gmail.com>:

The line number for the frame object changed behaviour in 3.8.

I am seeing this on Fedora rawhide, which ships "3.8.0~b4-1.fc32" package.

That happens when wrapping lines for calling functions.

Before, the line number sys._getframe(1).f_lineno indicate the last line. Now it is the first line.



Reproducer:

>>>
#!/usr/bin/env python

import sys


def func(a, b, c, d):

    frame = sys._getframe(1)

    print('call: %s' % (a))
    print('frame:                %s' % (frame))
    print('frame.f_code.co_name: %s' % (frame.f_code.co_name))
    print('frame.f_lineno:       %s' % (frame.f_lineno))


func('call 1, 1 line', 0, 1, 2)

func('call 2, 2 lines',
     0, 1, 2)

func('call 3, 4 lines',
     0,
     1,
     2)

<<<<


with python2 and python<=3.7, the line numbers are 16, 19, 24, respectively.

With 3.8, it changes to 16, 18, 21.

----------
messages: 353279
nosy: Thomas Haller
priority: normal
severity: normal
status: open
title: sys._getframe(1).f_lineno changed behavior in 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38283>
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