various python neatness cleanups

All changes were created by running

"pyupgrade --py3-only"

and committing the results. Although this has been performed in the
past, newer versions of pyupgrade can automatically catch more
opportunities, notably list comprehensions can use generators instead,
in the following cases:
- unpacking into function arguments as function(*generator)
- unpacking into assignments of the form x, y = generator
- as the argument to some builtin functions such as min/max/sorted

Also catch a few creeping cases of new code added using older styles.

mesonbuild/build.py

@@ -1035,7 +1035,7 @@ class BuildTarget(Target):
             self.link_whole(linktarget)
 
         c_pchlist, cpp_pchlist, clist, cpplist, cudalist, cslist, valalist,  objclist, objcpplist, fortranlist, rustlist \
-            = [extract_as_list(kwargs, c) for c in ['c_pch', 'cpp_pch', 'c_args', 'cpp_args', 'cuda_args', 'cs_args', 'vala_args', 'objc_args', 'objcpp_args', 'fortran_args', 'rust_args']]
+            = (extract_as_list(kwargs, c) for c in ['c_pch', 'cpp_pch', 'c_args', 'cpp_args', 'cuda_args', 'cs_args', 'vala_args', 'objc_args', 'objcpp_args', 'fortran_args', 'rust_args'])
 
         self.add_pch('c', c_pchlist)
         self.add_pch('cpp', cpp_pchlist)
@@ -2456,7 +2456,7 @@ class CustomTarget(Target, CommandBase):
             self.build_always_stale = kwargs['build_always_stale']
         if not isinstance(self.build_always_stale, bool):
             raise InvalidArguments('Argument build_always_stale must be a boolean.')
-        extra_deps, depend_files = [extract_as_list(kwargs, c, pop=False) for c in ['depends', 'depend_files']]
+        extra_deps, depend_files = (extract_as_list(kwargs, c, pop=False) for c in ['depends', 'depend_files'])
         for ed in extra_deps:
             if not isinstance(ed, (CustomTarget, BuildTarget)):
                 raise InvalidArguments('Can only depend on toplevel targets: custom_target or build_target '

mesonbuild/dependencies/base.py

@@ -127,7 +127,7 @@ class Dependency(HoldableObject):
     def get_all_compile_args(self) -> T.List[str]:
         """Get the compile arguments from this dependency and it's sub dependencies."""
         return list(itertools.chain(self.get_compile_args(),
-                                    *[d.get_all_compile_args() for d in self.ext_deps]))
+                                    *(d.get_all_compile_args() for d in self.ext_deps)))
 
     def get_link_args(self, language: T.Optional[str] = None, raw: bool = False) -> T.List[str]:
         if raw and self.raw_link_args is not None:
@@ -137,7 +137,7 @@ class Dependency(HoldableObject):
     def get_all_link_args(self) -> T.List[str]:
         """Get the link arguments from this dependency and it's sub dependencies."""
         return list(itertools.chain(self.get_link_args(),
-                                    *[d.get_all_link_args() for d in self.ext_deps]))
+                                    *(d.get_all_link_args() for d in self.ext_deps)))
 
     def found(self) -> bool:
         return self.is_found

mesonbuild/interpreter/compiler.py

@@ -574,7 +574,7 @@ class CompilerHolder(ObjectHolder['Compiler']):
         KwargInfo('static', (bool, NoneType), since='0.51.0'),
         KwargInfo('disabler', bool, default=False, since='0.49.0'),
         KwargInfo('dirs', ContainerTypeInfo(list, str), listify=True, default=[]),
-        *[k.evolve(name=f'header_{k.name}') for k in _HEADER_KWS]
+        *(k.evolve(name=f'header_{k.name}') for k in _HEADER_KWS)
     )
     def find_library_method(self, args: T.Tuple[str], kwargs: 'FindLibraryKW') -> 'dependencies.ExternalLibrary':
         # TODO add dependencies support?

mesonbuild/interpreter/type_checking.py

@@ -90,7 +90,7 @@ def _install_mode_convertor(mode: T.Optional[T.List[T.Union[str, bool, int]]]) -
     emtpy FileMode.
     """
     # this has already been validated by the validator
-    return FileMode(*[m if isinstance(m, str) else None for m in mode])
+    return FileMode(*(m if isinstance(m, str) else None for m in mode))
 
 
 def _lower_strlist(input: T.List[str]) -> T.List[str]:

mesonbuild/modules/gnome.py

@@ -184,7 +184,7 @@ class GnomeModule(ExtensionModule):
         glib_compile_resources = state.find_program('glib-compile-resources')
         cmd = [glib_compile_resources, '@INPUT@']
 
-        source_dirs, dependencies = [mesonlib.extract_as_list(kwargs, c, pop=True) for c in  ['source_dir', 'dependencies']]
+        source_dirs, dependencies = (mesonlib.extract_as_list(kwargs, c, pop=True) for c in  ['source_dir', 'dependencies'])
 
         if len(args) < 2:
             raise MesonException('Not enough arguments; the name of the resource '

mesonbuild/modules/unstable_cuda.py

@@ -264,7 +264,7 @@ class CudaModule(NewExtensionModule):
         elif isinstance(cuda_arch_list, str):
             cuda_arch_list = self._break_arch_string(cuda_arch_list)
 
-        cuda_arch_list = sorted([x for x in set(cuda_arch_list) if x])
+        cuda_arch_list = sorted(x for x in set(cuda_arch_list) if x)
 
         cuda_arch_bin = []
         cuda_arch_ptx = []

mesonbuild/mtest.py

@@ -1660,7 +1660,7 @@ class TestHarness:
             # wrapper script.
             sys.exit(125)
 
-        self.name_max_len = max([uniwidth(self.get_pretty_suite(test)) for test in tests])
+        self.name_max_len = max(uniwidth(self.get_pretty_suite(test)) for test in tests)
         startdir = os.getcwd()
         try:
             os.chdir(self.options.wd)
@@ -1668,8 +1668,8 @@ class TestHarness:
             for i in range(self.options.repeat):
                 runners.extend(self.get_test_runner(test) for test in tests)
                 if i == 0:
-                    self.duration_max_len = max([len(str(int(runner.timeout or 99)))
-                                                 for runner in runners])
+                    self.duration_max_len = max(len(str(int(runner.timeout or 99)))
+                                                 for runner in runners)
                     # Disable the progress report if it gets in the way
                     self.need_console = any(runner.console_mode is not ConsoleUser.LOGGER
                                              for runner in runners)

mesonbuild/scripts/clangformat.py

@@ -70,7 +70,7 @@ def clangformat(exelist: T.List[str], srcdir: Path, builddir: Path, check: bool)
                 any(fnmatch.fnmatch(strf, i) for i in ignore):
                 continue
             futures.append(e.submit(run_clang_format, exelist, f, check))
-        returncode = max([x.result().returncode for x in futures])
+        returncode = max(x.result().returncode for x in futures)
     return returncode
 
 def run(args: T.List[str]) -> int:

mesonbuild/scripts/clangtidy.py

@@ -36,7 +36,7 @@ def manual_clangtidy(srcdir_name: str, builddir_name: str) -> int:
             if strf.startswith(builddir_name):
                 continue
             futures.append(e.submit(subprocess.run, ['clang-tidy', '-p', builddir_name, strf]))
-        returncode = max([x.result().returncode for x in futures])
+        returncode = max(x.result().returncode for x in futures)
     return returncode
 
 def clangtidy(srcdir_name: str, builddir_name: str) -> int:

mesonbuild/scripts/depscan.py

@@ -197,7 +197,7 @@ class DependencyScanner:
 def run(args: T.List[str]) -> int:
     assert len(args) == 3, 'got wrong number of arguments!'
     pickle_file, outfile, jsonfile = args
-    with open(jsonfile, 'r', encoding='utf-8') as f:
+    with open(jsonfile, encoding='utf-8') as f:
         sources = json.load(f)
     scanner = DependencyScanner(pickle_file, outfile, sources)
     return scanner.scan()

run_project_tests.py

@@ -1253,11 +1253,11 @@ def _run_tests(all_tests: T.List[T.Tuple[str, T.List[TestDef], bool]],
             f.status = TestStatus.CANCELED
 
         if stop and not tests_canceled:
-            num_running = sum([1 if f2.status is TestStatus.RUNNING  else 0 for f2 in futures])
+            num_running = sum(1 if f2.status is TestStatus.RUNNING  else 0 for f2 in futures)
             for f2 in futures:
                 f2.cancel()
             executor.shutdown()
-            num_canceled = sum([1 if f2.status is TestStatus.CANCELED else 0 for f2 in futures])
+            num_canceled = sum(1 if f2.status is TestStatus.CANCELED else 0 for f2 in futures)
             safe_print(f'\nCanceled {num_canceled} out of {num_running} running tests.')
             safe_print(f'Finishing the remaining {num_running - num_canceled} tests.\n')
             tests_canceled = True
@@ -1297,7 +1297,7 @@ def _run_tests(all_tests: T.List[T.Tuple[str, T.List[TestDef], bool]],
             else:
                 skip_msg = 'Test ran, but was expected to be skipped'
                 status = TestStatus.UNEXRUN
-            result.msg = "%s for MESON_CI_JOBNAME '%s'" % (skip_msg, ci_jobname)
+            result.msg = f"{skip_msg} for MESON_CI_JOBNAME '{ci_jobname}'"
 
             f.update_log(status)
             current_test = ET.SubElement(current_suite, 'testcase', {'name': testname, 'classname': t.category})
@@ -1479,7 +1479,7 @@ def print_tool_versions() -> None:
         args = [t.tool] + t.args
         pc, o, e = Popen_safe(args)
         if pc.returncode != 0:
-            return '{} (invalid {} executable)'.format(exe, t.tool)
+            return f'{exe} (invalid {t.tool} executable)'
         for i in o.split('\n'):
             i = i.strip('\n\r\t ')
             m = t.regex.match(i)

test cases/common/22 object extraction/check-obj.py

@@ -9,9 +9,9 @@ output = None
 
 # Only the ninja backend produces compile_commands.json
 if sys.argv[1] == 'ninja':
-    with open('compile_commands.json', 'r') as f:
+    with open('compile_commands.json') as f:
         cc = json.load(f)
-    output = set((x['output'] for x in cc))
+    output = {x['output'] for x in cc}
 
 for obj in sys.argv[2:]:
     if not os.path.exists(obj):

test cases/cython/2 generated sources/generator.py

@@ -8,5 +8,5 @@ parser.add_argument('input')
 parser.add_argument('output')
 args = parser.parse_args()
 
-with open(args.input, 'r') as i, open(args.output, 'w') as o:
+with open(args.input) as i, open(args.output, 'w') as o:
     o.write(i.read())

unittests/allplatformstests.py

@@ -1339,7 +1339,7 @@ class AllPlatformTests(BasePlatformTests):
                 tar = tarfile.open(xz_distfile, "r:xz")  # [ignore encoding]
                 self.assertEqual(sorted(['samerepo-1.0',
                                          'samerepo-1.0/meson.build']),
-                                 sorted([i.name for i in tar]))
+                                 sorted(i.name for i in tar))
 
     def test_rpath_uses_ORIGIN(self):
         '''
@@ -2625,7 +2625,7 @@ class AllPlatformTests(BasePlatformTests):
         def assertKeyTypes(key_type_list, obj, strict: bool = True):
             for i in key_type_list:
                 if isinstance(i[1], (list, tuple)) and None in i[1]:
-                    i = (i[0], tuple([x for x in i[1] if x is not None]))
+                    i = (i[0], tuple(x for x in i[1] if x is not None))
                     if i[0] not in obj or obj[i[0]] is None:
                         continue
                 self.assertIn(i[0], obj)

unittests/datatests.py

@@ -145,8 +145,8 @@ class DataTests(unittest.TestCase):
             found_entries |= options
 
         self.assertEqual(found_entries, {
-            *[str(k) for k in mesonbuild.coredata.BUILTIN_OPTIONS],
-            *[str(k) for k in mesonbuild.coredata.BUILTIN_OPTIONS_PER_MACHINE],
+            *(str(k) for k in mesonbuild.coredata.BUILTIN_OPTIONS),
+            *(str(k) for k in mesonbuild.coredata.BUILTIN_OPTIONS_PER_MACHINE),
         })
 
         # Check that `buildtype` table inside `Core options` matches how

unittests/internaltests.py

@@ -509,8 +509,8 @@ class InternalTests(unittest.TestCase):
     def _test_all_naming(self, cc, env, patterns, platform):
         shr = patterns[platform]['shared']
         stc = patterns[platform]['static']
-        shrstc = shr + tuple([x for x in stc if x not in shr])
-        stcshr = stc + tuple([x for x in shr if x not in stc])
+        shrstc = shr + tuple(x for x in stc if x not in shr)
+        stcshr = stc + tuple(x for x in shr if x not in stc)
         p = cc.get_library_naming(env, LibType.SHARED)
         self.assertEqual(p, shr)
         p = cc.get_library_naming(env, LibType.STATIC)