Idle doesn't obey the new improved warnings arguements

[scottdaniels]

BPO	3926
Nosy	@amauryfa
Files	diff_trunk: File contains diffs for changes described above. test_idle_warnings.py: Test for (most of) discovered issues. parts.zip: Code and differs for Py idle_fixwarnings.diff

^{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 2009-08-14.14:03:46.052>
created_at = <Date 2008-09-21.23:52:15.660>
labels = ['expert-IDLE', 'type-bug', 'library']
title = "Idle doesn't obey the new improved warnings arguements"
updated_at = <Date 2009-08-14.15:08:03.321>
user = 'https://bugs.python.org/scottdaniels'

bugs.python.org fields:

activity = <Date 2009-08-14.15:08:03.321>
actor = 'gpolo'
assignee = 'none'
closed = True
closed_date = <Date 2009-08-14.14:03:46.052>
closer = 'gpolo'
components = ['IDLE', 'Library (Lib)']
creation = <Date 2008-09-21.23:52:15.660>
creator = 'scott_daniels'
dependencies = []
files = ['11636', '11637', '12113', '14638']
hgrepos = []
issue_num = 3926
keywords = ['patch']
message_count = 10.0
messages = ['73541', '73581', '73631', '73946', '73947', '76191', '76280', '91223', '91550', '91554']
nosy_count = 3.0
nosy_names = ['scott_daniels', 'amaury.forgeotdarc', 'gpolo']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue3926'
versions = ['Python 2.6', 'Python 3.0']

[scottdaniels]

Idle doesn't accept the new improved warnings arguments, thus escalating
warnings to failures. This is, I believe, the core reason that Idle was
failing on windows (warnings about deprecated set_daemon call escalated
to a failure).

Files affected: idlelib/PyShell.py and idlelib/run.py

On chasing this, it looks like the code in warnings.py is masking
IOErrors a little too broadly, so we should probably also narrow the
exception handling in warnings.py

Patch coming, but not ready just yet.

[gpolo]

The first part was already mentioned in bpo-3391, but not closing this
in favor of the second part of your message.

[scottdaniels]

I found that patch, but it confuses showwarning and formatwarning
parameter changes.

[scottdaniels]

OK, Issues:

1. warnings.py
   I/O errors in formatwarning will be masked and misinterpreted as
   failures to write on stderr, and no output will be attempted.

2. warnings.py
   A line with of whitespace will be shown, rather than suppressed.

3. idlelib/PyShell.py
   idle_show_warning did not take new args to showwarning.
   & a repeat of an error much like 1.

4. idlelib/PyShell.py
   idle_format_warning did not take new arg to formatwarning.

5. idlelib/PyShell.py
   extended_linecache_checkcache did not pass its arg along to
   orig_checkcache. Had to rename the element in the loop to
   avoid trashing the arg.

6. idlelib/run.py
   idle_formatwarning_subproc must also follow the new protocol for
   formatwarning.

[scottdaniels]

Here is a test for the fixes provided.

[amauryfa]

This is already corrected by r66922 (bpo-3391), but the patches are
different and there are some things I don't like in the present
implementation:

• in idle_showwarning, the "file" argument is ignored and always
  replaced by warning_stream.
• warnings.formatwarning is passed a "file" argument: this could fail,
  but works only because the function is monkey-patched. But "file" is not
  even used there!

The attached patch seems better, but does not apply cleanly any more.

[scottdaniels]

Attached parts.zip -- a zip of updates for Python 2.6 and Python 3.0
against the current source [zip has two

For Python 2.6:
py26/diff_py26.txt -- differ against python26-maint tree
py26/PyShell.py -- Replacement file for .../Lib/idlelib/PyShell.py
py26/run.py -- Replacement file for .../Lib/idlelib/run.py

For Python 3.0:
py30/py3k_diff.txt -- differ against python3k tree
py30/PyShell.py -- Replacement file for .../Lib/idlelib/PyShell.py
py30/run.py -- Replacement file for .../Lib/idlelib/run.py

[gpolo]

This looks good Scott, I'm just attaching the .diff here with real minor
changes and will be applying if no one is against it.

[gpolo]

Committed on r74447, will merge into py3k.

[gpolo]

Committed on r74447, will merge into py3k.

py3k: r74450