[PULL 0/2] Python patches

[PULL 0/2] Python patches

[John Snow]

The following changes since commit 831aaf24967a49d7750090b9dcfd6bf356f16529:

  Merge remote-tracking branch 'remotes/marcandre/tags/misc-pull-request' into staging (2021-09-14 18:14:56 +0100)

are available in the Git repository at:

  https://gitlab.com/jsnow/qemu.git tags/python-pull-request

for you to fetch changes up to eb8033f658e8b6f23ba9f4ef4a1b55894f7ea486:

  python: pylint 2.11 support (2021-09-16 15:04:04 -0400)

----------------------------------------------------------------
Python Pull request

This fixes the check-python-tox job.

CI including optional jobs is all green:
https://gitlab.com/jsnow/qemu/-/pipelines/372151147

----------------------------------------------------------------

John Snow (2):
  python: Update for pylint 2.10
  python: pylint 2.11 support

 python/qemu/machine/machine.py | 7 ++++++-
 python/setup.cfg               | 3 ++-
 2 files changed, 8 insertions(+), 2 deletions(-)

-- 
2.31.1

[PULL 1/2] python: Update for pylint 2.10

[John Snow]

A few new annoyances. Of note is the new warning for an unspecified
encoding when opening a text file, which actually does indicate a
potentially real problem; see
https://www.python.org/dev/peps/pep-0597/#motivation

Use LC_CTYPE to determine an encoding to use for interpreting QEMU's
terminal output. Note that Python states: "language code and encoding
may be None if their values cannot be determined" -- use a platform
default as a backup.

Notes: Passing encoding=None will generate a suppressed warning on
Python 3.10+ that 'None' should not be passed as the encoding
argument. This behavior may be deprecated in the future and the default
switched to be a ubiquitous UTF-8. Opting in to the locale default will
be done by passing the encoding 'locale', but that isn't available in
3.6 through 3.9. Presumably this warning will be unsuppressed some time
prior to the actual switch and we can re-investigate these issues at
that time if necessary.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Message-id: 20210916182248.721529-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
---
 python/qemu/machine/machine.py | 7 ++++++-
 python/setup.cfg               | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/python/qemu/machine/machine.py b/python/qemu/machine/machine.py
index a7081b1845..34131884a5 100644
--- a/python/qemu/machine/machine.py
+++ b/python/qemu/machine/machine.py
@@ -19,6 +19,7 @@
 
 import errno
 from itertools import chain
+import locale
 import logging
 import os
 import shutil
@@ -290,8 +291,12 @@ def get_pid(self) -> Optional[int]:
         return self._subp.pid
 
     def _load_io_log(self) -> None:
+        # Assume that the output encoding of QEMU's terminal output is
+        # defined by our locale. If indeterminate, allow open() to fall
+        # back to the platform default.
+        _, encoding = locale.getlocale()
         if self._qemu_log_path is not None:
-            with open(self._qemu_log_path, "r") as iolog:
+            with open(self._qemu_log_path, "r", encoding=encoding) as iolog:
                 self._iolog = iolog.read()
 
     @property
diff --git a/python/setup.cfg b/python/setup.cfg
index 83909c1c97..0f0cab098f 100644
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -104,6 +104,7 @@ good-names=i,
 [pylint.similarities]
 # Ignore imports when computing similarities.
 ignore-imports=yes
+ignore-signatures=yes
 
 # Minimum lines number of a similarity.
 # TODO: Remove after we opt in to Pylint 2.8.3. See commit msg.
-- 
2.31.1

[PULL 2/2] python: pylint 2.11 support

[John Snow]

We're not ready to enforce f-strings everywhere, so just silence this
new warning.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Message-id: 20210916182248.721529-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
---
 python/setup.cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/setup.cfg b/python/setup.cfg
index 0f0cab098f..fdca265fec 100644
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -87,7 +87,7 @@ ignore_missing_imports = True
 # --enable=similarities". If you want to run only the classes checker, but have
 # no Warning level messages displayed, use "--disable=all --enable=classes
 # --disable=W".
-disable=
+disable=consider-using-f-string,
 
 [pylint.basic]
 # Good variable names which should always be accepted, separated by a comma.
-- 
2.31.1

Re: [PULL 0/2] Python patches

[Peter Maydell]

On Thu, 16 Sept 2021 at 23:07, John Snow <jsnow@redhat.com> wrote:
>
> The following changes since commit 831aaf24967a49d7750090b9dcfd6bf356f16529:
>
>   Merge remote-tracking branch 'remotes/marcandre/tags/misc-pull-request' into staging (2021-09-14 18:14:56 +0100)
>
> are available in the Git repository at:
>
>   https://gitlab.com/jsnow/qemu.git tags/python-pull-request
>
> for you to fetch changes up to eb8033f658e8b6f23ba9f4ef4a1b55894f7ea486:
>
>   python: pylint 2.11 support (2021-09-16 15:04:04 -0400)
>
> ----------------------------------------------------------------
> Python Pull request
>
> This fixes the check-python-tox job.
>
> CI including optional jobs is all green:
> https://gitlab.com/jsnow/qemu/-/pipelines/372151147
>


Applied, thanks.

Please update the changelog at https://wiki.qemu.org/ChangeLog/6.2
for any user-visible changes.

-- PMM