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[PATCH v8 04/11] iotests: replace mutable list default args

From: John Snow
Subject: [PATCH v8 04/11] iotests: replace mutable list default args
Date: Mon, 16 Mar 2020 20:40:58 -0400

It's bad hygiene: if we modify this list, it will be modified across all

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

Signed-off-by: John Snow <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <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 cb9c2cd05d..7cd74e7cb1 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:
@@ -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):
         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))
@@ -970,7 +970,7 @@ 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 \
@@ -984,7 +984,7 @@ def verify_image_format(supported_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:
@@ -1003,11 +1003,11 @@ 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)
@@ -1047,7 +1047,7 @@ 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):
@@ -1098,11 +1098,11 @@ def execute_unittest(output, verbosity, debug):
 def execute_test(test_function=None,
-                 supported_fmts=[],
+                 supported_fmts=(),
-                 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

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