Clean up some uses of set, list, and dict

* Use set literals instead of set([...])
* Avoid list(sorted(...)) as sorted returns a list
* Replace dict() with dict literal

src/flake8/checker.py

@@ -19,7 +19,7 @@ from flake8 import utils
 
 LOG = logging.getLogger(__name__)
 
-SERIAL_RETRY_ERRNOS = set([
+SERIAL_RETRY_ERRNOS = {
     # ENOSPC: Added by sigmavirus24
     # > On some operating systems (OSX), multiprocessing may cause an
     # > ENOSPC error while trying to trying to create a Semaphore.
@@ -32,7 +32,7 @@ SERIAL_RETRY_ERRNOS = set([
     # on the lines before the error code and always append your error
     # code. Further, please always add a trailing `,` to reduce the visual
     # noise in diffs.
-])
+}
 
 
 class Manager(object):

src/flake8/defaults.py

@@ -25,7 +25,7 @@ IGNORE = (
 SELECT = ('E', 'F', 'W', 'C90')
 MAX_LINE_LENGTH = 79
 
-TRUTHY_VALUES = set(['true', '1', 't'])
+TRUTHY_VALUES = {'true', '1', 't'}
 
 # Other constants
 WHITESPACE = frozenset(' \t')

src/flake8/main/application.py

@@ -261,7 +261,7 @@ class Application(object):
             List of filenames to process
         """
         if self.running_against_diff:
-            files = list(sorted(self.parsed_diff.keys()))
+            files = sorted(self.parsed_diff.keys())
         self.file_checker_manager.start(files)
         self.file_checker_manager.run()
         LOG.info('Finished running')

src/flake8/options/config.py

@@ -133,10 +133,10 @@ class MergedConfigParser(object):
 
     #: Set of types that should use the
     #: :meth:`~configparser.RawConfigParser.getint` method.
-    GETINT_TYPES = set(['int', 'count'])
+    GETINT_TYPES = {'int', 'count'}
     #: Set of actions that should use the
     #: :meth:`~configparser.RawConfigParser.getbool` method.
-    GETBOOL_ACTIONS = set(['store_true', 'store_false'])
+    GETBOOL_ACTIONS = {'store_true', 'store_false'}
 
     def __init__(self, option_manager, extra_config_files=None, args=None):
         """Initialize the MergedConfigParser instance.

src/flake8/plugins/pyflakes.py

@@ -17,35 +17,35 @@ import pyflakes.checker
 from flake8 import utils
 
 
-FLAKE8_PYFLAKES_CODES = dict([line.split()[::-1] for line in (
+FLAKE8_PYFLAKES_CODES = {
-    'F401 UnusedImport',
+    'UnusedImport': 'F401',
-    'F402 ImportShadowedByLoopVar',
+    'ImportShadowedByLoopVar': 'F402',
-    'F403 ImportStarUsed',
+    'ImportStarUsed': 'F403',
-    'F404 LateFutureImport',
+    'LateFutureImport': 'F404',
-    'F405 ImportStarUsage',
+    'ImportStarUsage': 'F405',
-    'F406 ImportStarNotPermitted',
+    'ImportStarNotPermitted': 'F406',
-    'F407 FutureFeatureNotDefined',
+    'FutureFeatureNotDefined': 'F407',
-    'F601 MultiValueRepeatedKeyLiteral',
+    'MultiValueRepeatedKeyLiteral': 'F601',
-    'F602 MultiValueRepeatedKeyVariable',
+    'MultiValueRepeatedKeyVariable': 'F602',
-    'F621 TooManyExpressionsInStarredAssignment',
+    'TooManyExpressionsInStarredAssignment': 'F621',
-    'F622 TwoStarredExpressions',
+    'TwoStarredExpressions': 'F622',
-    'F631 AssertTuple',
+    'AssertTuple': 'F631',
-    'F701 BreakOutsideLoop',
+    'BreakOutsideLoop': 'F701',
-    'F702 ContinueOutsideLoop',
+    'ContinueOutsideLoop': 'F702',
-    'F703 ContinueInFinally',
+    'ContinueInFinally': 'F703',
-    'F704 YieldOutsideFunction',
+    'YieldOutsideFunction': 'F704',
-    'F705 ReturnWithArgsInsideGenerator',
+    'ReturnWithArgsInsideGenerator': 'F705',
-    'F706 ReturnOutsideFunction',
+    'ReturnOutsideFunction': 'F706',
-    'F707 DefaultExceptNotLast',
+    'DefaultExceptNotLast': 'F707',
-    'F721 DoctestSyntaxError',
+    'DoctestSyntaxError': 'F721',
-    'F811 RedefinedWhileUnused',
+    'RedefinedWhileUnused': 'F811',
-    'F812 RedefinedInListComp',
+    'RedefinedInListComp': 'F812',
-    'F821 UndefinedName',
+    'UndefinedName': 'F821',
-    'F822 UndefinedExport',
+    'UndefinedExport': 'F822',
-    'F823 UndefinedLocal',
+    'UndefinedLocal': 'F823',
-    'F831 DuplicateArgument',
+    'DuplicateArgument': 'F831',
-    'F841 UnusedVariable',
+    'UnusedVariable': 'F841',
-)])
+}
 
 
 def patch_pyflakes():

src/flake8/statistics.py

@@ -17,7 +17,7 @@ class Statistics(object):
         :rtype:
             list(str)
         """
-        return list(sorted(set(key.code for key in self._store.keys())))
+        return sorted({key.code for key in self._store.keys()})
 
     def record(self, error):
         """Add the fact that the error was seen in the file.

tests/unit/test_debug.py

@@ -45,8 +45,8 @@ def test_information(system, pyversion, pyimpl):
         },
     }
     option_manager = mock.Mock(
-        registered_plugins=set([('pycodestyle', '2.0.0'),
+        registered_plugins={('pycodestyle', '2.0.0'),
-                                ('mccabe', '0.5.9')]),
+                            ('mccabe', '0.5.9')},
         version='3.1.0',
     )
     assert expected == debug.information(option_manager)

tests/unit/test_option_manager.py

@@ -209,9 +209,9 @@ def test_extend_default_ignore(optmanager):
     assert optmanager.extended_default_ignore == set()
 
     optmanager.extend_default_ignore(['T100', 'T101', 'T102'])
-    assert optmanager.extended_default_ignore == set(['T100',
+    assert optmanager.extended_default_ignore == {'T100',
-                                                      'T101',
+                                                  'T101',
-                                                      'T102'])
+                                                  'T102'}
 
 
 def test_parse_known_args(optmanager):