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Re: [PATCH v7 04/10] iotests: replace mutable list default args


From: Philippe Mathieu-Daudé
Subject: Re: [PATCH v7 04/10] iotests: replace mutable list default args
Date: Wed, 4 Mar 2020 22:59:14 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 3/4/20 10:38 PM, John Snow wrote:
It's bad hygiene: if we modify this list, it will be modified across all
invocations.

(Remaining bad usages are fixed in a subsequent patch which changes the
function signature anyway.)

Signed-off-by: John Snow <address@hidden>
---
  tests/qemu-iotests/iotests.py | 24 ++++++++++++------------
  1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index fd65b90691..54d68774e1 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -136,7 +136,7 @@ def qemu_img_log(*args):
      log(result, filters=[filter_testfiles])
      return result
-def img_info_log(filename, filter_path=None, imgopts=False, extra_args=[]):
+def img_info_log(filename, filter_path=None, imgopts=False, extra_args=()):
      args = ['info']
      if imgopts:
          args.append('--image-opts')
@@ -350,7 +350,7 @@ def _filter(_key, value):
          return value
      return filter_qmp(qmsg, _filter)
-def log(msg, filters=[], indent=None):
+def log(msg, filters=(), indent=None):
      '''Logs either a string message or a JSON serializable message (like QMP).
      If indent is provided, JSON serializable messages are pretty-printed.'''
      for flt in filters:
@@ -566,7 +566,7 @@ def get_qmp_events_filtered(self, wait=60.0):
              result.append(filter_qmp_event(ev))
          return result
- def qmp_log(self, cmd, filters=[], indent=None, **kwargs):
+    def qmp_log(self, cmd, filters=(), indent=None, **kwargs):
          full_cmd = OrderedDict((
              ("execute", cmd),
              ("arguments", ordered_qmp(kwargs))
@@ -967,7 +967,7 @@ def case_notrun(reason):
      open('%s/%s.casenotrun' % (output_dir, seq), 'a').write(
          '    [case not run] ' + reason + '\n')
-def verify_image_format(supported_fmts=[], unsupported_fmts=[]):
+def verify_image_format(supported_fmts=(), unsupported_fmts=()):
      assert not (supported_fmts and unsupported_fmts)
if 'generic' in supported_fmts and \
@@ -981,7 +981,7 @@ def verify_image_format(supported_fmts=[], 
unsupported_fmts=[]):
      if not_sup or (imgfmt in unsupported_fmts):
          notrun('not suitable for this image format: %s' % imgfmt)
-def verify_protocol(supported=[], unsupported=[]):
+def verify_protocol(supported=(), unsupported=()):
      assert not (supported and unsupported)
if 'generic' in supported:
@@ -1000,11 +1000,11 @@ def verify_platform(supported=None, unsupported=None):
          if not any((sys.platform.startswith(x) for x in supported)):
              notrun('not suitable for this OS: %s' % sys.platform)
-def verify_cache_mode(supported_cache_modes=[]):
+def verify_cache_mode(supported_cache_modes=()):
      if supported_cache_modes and (cachemode not in supported_cache_modes):
          notrun('not suitable for this cache mode: %s' % cachemode)
-def verify_aio_mode(supported_aio_modes=[]):
+def verify_aio_mode(supported_aio_modes=()):
      if supported_aio_modes and (aiomode not in supported_aio_modes):
          notrun('not suitable for this aio mode: %s' % aiomode)
@@ -1044,7 +1044,7 @@ def supported_formats(read_only=False): return supported_formats.formats[read_only] -def skip_if_unsupported(required_formats=[], read_only=False):
+def skip_if_unsupported(required_formats=(), read_only=False):
      '''Skip Test Decorator
         Runs the test if all the required formats are whitelisted'''
      def skip_test_decorator(func):
@@ -1095,11 +1095,11 @@ def execute_unittest(output, verbosity, debug):
              sys.stderr.write(out)
def execute_test(test_function=None,
-                 supported_fmts=[],
+                 supported_fmts=(),
                   supported_platforms=None,
-                 supported_cache_modes=[], supported_aio_modes={},
-                 unsupported_fmts=[], supported_protocols=[],
-                 unsupported_protocols=[]):
+                 supported_cache_modes=(), supported_aio_modes=(),
+                 unsupported_fmts=(), supported_protocols=(),
+                 unsupported_protocols=()):
      """Run either unittest or script-style tests."""
# We are using TEST_DIR and QEMU_DEFAULT_MACHINE as proxies to


Reviewed-by: Philippe Mathieu-Daudé <address@hidden>




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