py27+ syntax improvements

pre_commit/commands/autoupdate.py

@@ -50,8 +50,8 @@ def _update_repository(repo_config, runner):
     new_repo = Repository.create(new_config, runner.store)
 
     # See if any of our hooks were deleted with the new commits
-    hooks = set(hook_id for hook_id, _ in repo.hooks)
+    hooks = {hook_id for hook_id, _ in repo.hooks}
-    hooks_missing = hooks - (hooks & set(new_repo.manifest.hooks.keys()))
+    hooks_missing = hooks - (hooks & set(new_repo.manifest.hooks))
     if hooks_missing:
         raise RepositoryCannotBeUpdatedError(
             'Cannot update because the tip of master is missing these hooks:\n'

pre_commit/commands/run.py

@@ -19,7 +19,7 @@ logger = logging.getLogger('pre_commit')
 
 def _get_skips(environ):
     skips = environ.get('SKIP', '')
-    return set(skip.strip() for skip in skips.split(',') if skip.strip())
+    return {skip.strip() for skip in skips.split(',') if skip.strip()}
 
 
 def _hook_msg_start(hook, verbose):

pre_commit/git.py

@@ -88,7 +88,7 @@ def get_files_matching(all_file_list_strategy):
     def wrapper(include_expr, exclude_expr):
         include_regex = re.compile(include_expr)
         exclude_regex = re.compile(exclude_expr)
-        return set(
+        return {
             filename
             for filename in all_file_list_strategy()
             if (
@@ -96,7 +96,7 @@ def get_files_matching(all_file_list_strategy):
                 not exclude_regex.search(filename) and
                 os.path.lexists(filename)
             )
-        )
+        }
     return wrapper
 
 

pre_commit/manifest.py

@@ -21,4 +21,4 @@ class Manifest(object):
 
     @cached_property
     def hooks(self):
-        return dict((hook['id'], hook) for hook in self.manifest_contents)
+        return {hook['id']: hook for hook in self.manifest_contents}

pre_commit/repository.py

@@ -57,10 +57,10 @@ class Repository(object):
 
     @cached_property
     def languages(self):
-        return set(
+        return {
             (hook['language'], hook['language_version'])
             for _, hook in self.hooks
-        )
+        }
 
     @cached_property
     def additional_dependencies(self):

pre_commit/util.py

@@ -75,9 +75,9 @@ def no_git_env():
     # while running pre-commit hooks in submodules.
     # GIT_DIR: Causes git clone to clone wrong thing
     # GIT_INDEX_FILE: Causes 'error invalid object ...' during commit
-    return dict(
+    return {
-        (k, v) for k, v in os.environ.items() if not k.startswith('GIT_')
+        k: v for k, v in os.environ.items() if not k.startswith('GIT_')
-    )
+    }
 
 
 @contextlib.contextmanager
@@ -164,10 +164,10 @@ def cmd_output(*cmd, **kwargs):
 
     # py2/py3 on windows are more strict about the types here
     cmd = tuple(five.n(arg) for arg in cmd)
-    kwargs['env'] = dict(
+    kwargs['env'] = {
-        (five.n(key), five.n(value))
+        five.n(key): five.n(value)
         for key, value in kwargs.pop('env', {}).items()
-    ) or None
+    } or None
 
     try:
         cmd = parse_shebang.normalize_cmd(cmd)

tests/commands/run_test.py

@@ -339,13 +339,13 @@ def test_compute_cols(hooks, verbose, expected):
 @pytest.mark.parametrize(
     ('environ', 'expected_output'),
     (
-        ({}, set([])),
+        ({}, set()),
-        ({'SKIP': ''}, set([])),
+        ({'SKIP': ''}, set()),
-        ({'SKIP': ','}, set([])),
+        ({'SKIP': ','}, set()),
-        ({'SKIP': ',foo'}, set(['foo'])),
+        ({'SKIP': ',foo'}, {'foo'}),
-        ({'SKIP': 'foo'}, set(['foo'])),
+        ({'SKIP': 'foo'}, {'foo'}),
-        ({'SKIP': 'foo,bar'}, set(['foo', 'bar'])),
+        ({'SKIP': 'foo,bar'}, {'foo', 'bar'}),
-        ({'SKIP': ' foo , bar'}, set(['foo', 'bar'])),
+        ({'SKIP': ' foo , bar'}, {'foo', 'bar'}),
     ),
 )
 def test_get_skips(environ, expected_output):

tests/git_test.py

@@ -80,25 +80,22 @@ def get_files_matching_func():
 
 def test_get_files_matching_base(get_files_matching_func):
     ret = get_files_matching_func('', '^$')
-    assert ret == set([
+    assert ret == {
         'pre_commit/main.py',
         'pre_commit/git.py',
         'hooks.yaml',
         'testing/test_symlink'
-    ])
+    }
 
 
 def test_get_files_matching_total_match(get_files_matching_func):
     ret = get_files_matching_func('^.*\\.py$', '^$')
-    assert ret == set([
+    assert ret == {'pre_commit/main.py', 'pre_commit/git.py'}
-        'pre_commit/main.py',
-        'pre_commit/git.py',
-    ])
 
 
 def test_does_search_instead_of_match(get_files_matching_func):
     ret = get_files_matching_func('\\.yaml$', '^$')
-    assert ret == set(['hooks.yaml'])
+    assert ret == {'hooks.yaml'}
 
 
 def test_does_not_include_deleted_fileS(get_files_matching_func):
@@ -108,7 +105,7 @@ def test_does_not_include_deleted_fileS(get_files_matching_func):
 
 def test_exclude_removes_files(get_files_matching_func):
     ret = get_files_matching_func('', '\\.py$')
-    assert ret == set(['hooks.yaml', 'testing/test_symlink'])
+    assert ret == {'hooks.yaml', 'testing/test_symlink'}
 
 
 def resolve_conflict():
@@ -124,12 +121,12 @@ def test_get_conflicted_files(in_merge_conflict):
     cmd_output('git', 'add', 'other_file')
 
     ret = set(git.get_conflicted_files())
-    assert ret == set(('conflict_file', 'other_file'))
+    assert ret == {'conflict_file', 'other_file'}
 
 
 def test_get_conflicted_files_in_submodule(in_conflicting_submodule):
     resolve_conflict()
-    assert set(git.get_conflicted_files()) == set(('conflict_file',))
+    assert set(git.get_conflicted_files()) == {'conflict_file'}
 
 
 def test_get_conflicted_files_unstaged_files(in_merge_conflict):
@@ -142,7 +139,7 @@ def test_get_conflicted_files_unstaged_files(in_merge_conflict):
         bar_only_file.write('new contents!\n')
 
     ret = set(git.get_conflicted_files())
-    assert ret == set(('conflict_file',))
+    assert ret == {'conflict_file'}
 
 
 MERGE_MSG = "Merge branch 'foo' into bar\n\nConflicts:\n\tconflict_file\n"

tests/repository_test.py

@@ -426,7 +426,7 @@ def test_languages(tempdir_factory, store):
     path = make_repo(tempdir_factory, 'python_hooks_repo')
     config = make_config_from_repo(path)
     repo = Repository.create(config, store)
-    assert repo.languages == set([('python', 'default')])
+    assert repo.languages == {('python', 'default')}
 
 
 @pytest.mark.integration
@@ -435,7 +435,7 @@ def test_additional_dependencies(tempdir_factory, store):
     config = make_config_from_repo(path)
     config['hooks'][0]['additional_dependencies'] = ['pep8']
     repo = Repository.create(config, store)
-    assert repo.additional_dependencies['python']['default'] == set(('pep8',))
+    assert repo.additional_dependencies['python']['default'] == {'pep8'}
 
 
 @pytest.mark.integration