yamllint version 1.29.0

This option lists the files to lint by yamllint, taking into account `ignore`
and `yaml-files` configuration options.

.github/workflows/ci.yaml

@@ -8,18 +8,21 @@ on:  # yamllint disable-line rule:truthy
     branches:
       - master
 
+permissions:
+  contents: read
+
 jobs:
   lint:
     name: Linters
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
       - run:
-          python -m pip install flake8 flake8-import-order doc8 sphinx
+          python -m pip install flake8 flake8-import-order sphinx
-            rstcheck[sphinx]
+            rstcheck[sphinx] doc8
       - run: python -m pip install .
       - run: flake8 .
       - run: doc8 $(git ls-files '*.rst')
@@ -34,16 +37,16 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - '3.6'
           - '3.7'
           - '3.8'
           - '3.9'
           - '3.10'
+          - '3.11'
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Append GitHub Actions system path

CHANGELOG.rst

@@ -1,6 +1,19 @@
 Changelog
 =========
 
+1.29.0 (2023-01-10)
+-------------------
+
+- Add support for Python 3.11, drop support for Python 3.6
+- Rule ``float-values``: fix bug on strings containing fordidden values
+- Stop releasing universal wheels
+- Use proper Python 3 I/O type for file reading
+- Rule ``indentation``: fix ``indent-sequences`` in nested collections
+- Docs: clarify ``disable-line`` and parser errors, give a workaround
+- Refactors to apply some pyupgrade suggestions
+- Allow using a list of strings in ``ignore`` configuration
+- Add ``--list-files`` command line option
+
 1.28.0 (2022-09-12)
 -------------------
 

docs/conf.py

@@ -38,7 +38,7 @@ htmlhelp_basename = 'yamllintdoc'
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
-    ('index', 'yamllint', 'Linter for YAML files', [u'Adrien Vergé'], 1)
+    ('index', 'yamllint', 'Linter for YAML files', ['Adrien Vergé'], 1)
 ]
 
 # -- Build with sphinx automodule without needing to install third-party libs

docs/configuration.rst

@@ -136,11 +136,19 @@ directories, set ``yaml-files`` configuration option. The default is:
 The same rules as for ignoring paths apply (``.gitignore``-style path pattern,
 see below).
 
+If you need to know the exact list of files that yamllint would process,
+without really linting them, you can use ``--list-files``:
+
+.. code:: bash
+
+ yamllint --list-files .
+
 Ignoring paths
 --------------
 
 It is possible to exclude specific files or directories, so that the linter
-doesn't process them.
+doesn't process them. They can be provided either as a list of paths, or as a
+bulk string.
 
 You can either totally ignore files (they won't be looked at):
 
@@ -153,6 +161,13 @@ You can either totally ignore files (they won't be looked at):
    all/this/directory/
    *.template.yaml
 
+ # or:
+
+ ignore:
+   - /this/specific/file.yaml
+   - all/this/directory/
+   - '*.template.yaml'
+
 or ignore paths only for specific rules:
 
 .. code-block:: yaml
@@ -165,6 +180,14 @@ or ignore paths only for specific rules:
        /this-file-has-trailing-spaces-but-it-is-OK.yaml
        /generated/*.yaml
 
+ # or:
+
+ rules:
+   trailing-spaces:
+     ignore:
+       - /this-file-has-trailing-spaces-but-it-is-OK.yaml
+       - /generated/*.yaml
+
 Note that this ``.gitignore``-style path pattern allows complex path
 exclusion/inclusion, see the `pathspec README file
 <https://pypi.python.org/pypi/pathspec>`_ for more details.
@@ -204,6 +227,13 @@ or:
 
 .. note:: However, this is mutually exclusive with the ``ignore`` key.
 
+If you need to know the exact list of files that yamllint would process,
+without really linting them, you can use ``--list-files``:
+
+.. code:: bash
+
+ yamllint --list-files .
+
 Setting the locale
 ------------------
 

docs/disable_with_comments.rst

@@ -40,6 +40,11 @@ specific line:
  # yamllint disable-line
  -  {    all : rules ,are disabled   for this line}
 
+You can't make yamllint ignore invalid YAML syntax on a line (which generates a
+`syntax error`), such as when templating a YAML file with Jinja. In some cases,
+you can workaround this by putting the templating syntax in a YAML comment. See
+`Putting template flow control in comments`_.
+
 If you need to disable multiple rules, it is allowed to chain rules like this:
 ``# yamllint disable-line rule:hyphens rule:commas rule:indentation``.
 
@@ -89,7 +94,6 @@ For instance:
  key: value 2
 
  - This line is waaaaaaaaaay too long but yamllint will not report anything about it.
-   This line will be checked by yamllint.
 
 or:
 
@@ -101,3 +105,32 @@ or:
  key1: value1
  {% endif %}
  key2: value2
+
+Putting template flow control in comments
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Alternatively for templating you can wrap the template statements in comments
+to make it a valid YAML file. As long as the templating language doesn't use
+the same comment symbol, it should be a valid template and valid YAML (pre and
+post-template processing).
+
+Example of a Jinja2 code that cannot be parsed as YAML because it contains
+invalid tokens ``{%`` and ``%}``:
+
+.. code-block::
+
+ # This file IS NOT valid YAML and will produce syntax errors
+ {% if extra_info %}
+ key1: value1
+ {% endif %}
+ key2: value2
+
+But it can be fixed using YAML comments:
+
+.. code-block:: yaml
+
+ # This file IS valid YAML because the Jinja is in a YAML comment
+ # {% if extra_info %}
+ key1: value1
+ # {% endif %}
+ key2: value2

docs/integration.rst

@@ -26,7 +26,7 @@ Actions <https://github.com/features/actions>`_ and automatically uses the
 suited output format to decorate code with linting errors. You can also force
 the GitHub Actions output with ``yamllint --format github``.
 
-An minimal example workflow using GitHub Actions:
+A minimal example workflow using GitHub Actions:
 
 .. code:: yaml
 

setup.cfg

@@ -1,6 +1,3 @@
-[bdist_wheel]
-universal = 1
-
 [flake8]
 import-order-style = pep8
 application-import-names = yamllint
@@ -27,11 +24,11 @@ classifiers =
   Intended Audience :: Developers
   License :: OSI Approved :: GNU General Public License v3 (GPLv3)
   Programming Language :: Python :: 3
-  Programming Language :: Python :: 3.6
   Programming Language :: Python :: 3.7
   Programming Language :: Python :: 3.8
   Programming Language :: Python :: 3.9
   Programming Language :: Python :: 3.10
+  Programming Language :: Python :: 3.11
   Topic :: Software Development
   Topic :: Software Development :: Debuggers
   Topic :: Software Development :: Quality Assurance
@@ -46,7 +43,7 @@ project_urls =
 [options]
 packages = find:
 
-python_requires = >=3.6
+python_requires = >=3.7
 
 include_package_data = True
 install_requires =

tests/rules/test_float_values.py

@@ -40,6 +40,8 @@ class FloatValuesTestCase(RuleTestCase):
                    '- 0.0\n'
                    '- .1\n'
                    '- \'.1\'\n'
+                   '- string.1\n'
+                   '- .1string\n'
                    '- !custom_tag .2\n'
                    '- &angle1 0.0\n'
                    '- *angle1\n'
@@ -47,7 +49,7 @@ class FloatValuesTestCase(RuleTestCase):
                    '- *angle2\n',
                    conf,
                    problem1=(3, 3),
-                   problem2=(8, 11))
+                   problem2=(10, 11))
 
     def test_scientific_notation(self):
         conf = (
@@ -61,6 +63,8 @@ class FloatValuesTestCase(RuleTestCase):
                    '- 10e-6\n'
                    '- 0.00001\n'
                    '- \'10e-6\'\n'
+                   '- string10e-6\n'
+                   '- 10e-6string\n'
                    '- !custom_tag 10e-6\n'
                    '- &angle1 0.000001\n'
                    '- *angle1\n'
@@ -71,8 +75,8 @@ class FloatValuesTestCase(RuleTestCase):
                    conf,
                    problem1=(2, 3),
                    problem2=(3, 3),
-                   problem3=(9, 11),
+                   problem3=(11, 11),
-                   problem4=(11, 11))
+                   problem4=(13, 11))
 
     def test_nan(self):
         conf = (
@@ -85,13 +89,15 @@ class FloatValuesTestCase(RuleTestCase):
                    '- .NaN\n'
                    '- .NAN\n'
                    '- \'.NaN\'\n'
+                   '- a.NaN\n'
+                   '- .NaNa\n'
                    '- !custom_tag .NaN\n'
                    '- &angle .nan\n'
                    '- *angle\n',
                    conf,
                    problem1=(2, 3),
                    problem2=(3, 3),
-                   problem3=(6, 10))
+                   problem3=(8, 10))
 
     def test_inf(self):
         conf = (
@@ -106,6 +112,8 @@ class FloatValuesTestCase(RuleTestCase):
                    '- -.inf\n'
                    '- -.INF\n'
                    '- \'.inf\'\n'
+                   '- ∞.infinity\n'
+                   '- .infinity∞\n'
                    '- !custom_tag .inf\n'
                    '- &angle .inf\n'
                    '- *angle\n'
@@ -116,5 +124,5 @@ class FloatValuesTestCase(RuleTestCase):
                    problem2=(3, 3),
                    problem3=(4, 3),
                    problem4=(5, 3),
-                   problem5=(8, 10),
+                   problem5=(10, 10),
-                   problem6=(10, 10))
+                   problem6=(12, 10))

tests/rules/test_indentation.py

@@ -1370,6 +1370,45 @@ class IndentationTestCase(RuleTestCase):
                    '               key: value\n'
                    '...\n', conf, problem=(2, 2))
 
+    def test_nested_collections_with_spaces_consistent(self):
+        """Tests behavior of {spaces: consistent} in nested collections to
+        ensure wrong-indentation is properly caught--especially when the
+        expected indent value is initially unknown. For details, see
+        https://github.com/adrienverge/yamllint/issues/485.
+        """
+        conf = ('indentation: {spaces: consistent,\n'
+                '              indent-sequences: true}')
+        self.check('---\n'
+                   '- item:\n'
+                   '  - elem\n'
+                   '- item:\n'
+                   '    - elem\n'
+                   '...\n', conf, problem=(3, 3))
+        conf = ('indentation: {spaces: consistent,\n'
+                '              indent-sequences: false}')
+        self.check('---\n'
+                   '- item:\n'
+                   '  - elem\n'
+                   '- item:\n'
+                   '    - elem\n'
+                   '...\n', conf, problem=(5, 5))
+        conf = ('indentation: {spaces: consistent,\n'
+                '              indent-sequences: consistent}')
+        self.check('---\n'
+                   '- item:\n'
+                   '  - elem\n'
+                   '- item:\n'
+                   '    - elem\n'
+                   '...\n', conf, problem=(5, 5))
+        conf = ('indentation: {spaces: consistent,\n'
+                '              indent-sequences: whatever}')
+        self.check('---\n'
+                   '- item:\n'
+                   '  - elem\n'
+                   '- item:\n'
+                   '    - elem\n'
+                   '...\n', conf)
+
     def test_return(self):
         conf = 'indentation: {spaces: consistent}'
         self.check('---\n'

tests/test_cli.py

@@ -92,12 +92,12 @@ class CommandLineTestCase(unittest.TestCase):
             'no-yaml.json': '---\n'
                             'key: value\n',
             # non-ASCII chars
-            u'non-ascii/éçäγλνπ¥/utf-8': (
+            'non-ascii/éçäγλνπ¥/utf-8': (
-                u'---\n'
+                '---\n'
-                u'- hétérogénéité\n'
+                '- hétérogénéité\n'
-                u'# 19.99 €\n'
+                '# 19.99 €\n'
-                u'- お早う御座います。\n'
+                '- お早う御座います。\n'
-                u'# الأَبْجَدِيَّة العَرَبِيَّة\n').encode('utf-8'),
+                '# الأَبْجَدِيَّة العَرَبِيَّة\n').encode('utf-8'),
             # dos line endings yaml
             'dos.yml': '---\r\n'
                        'dos: true',
@@ -678,6 +678,39 @@ class CommandLineTestCase(unittest.TestCase):
         self.assertEqual(
             (ctx.returncode, ctx.stdout, ctx.stderr), (1, expected_out, ''))
 
+    def test_run_list_files(self):
+        with RunContext(self) as ctx:
+            cli.run(('--list-files', self.wd))
+        self.assertEqual(ctx.returncode, 0)
+        self.assertEqual(
+            sorted(ctx.stdout.splitlines()),
+            [os.path.join(self.wd, 'a.yaml'),
+             os.path.join(self.wd, 'c.yaml'),
+             os.path.join(self.wd, 'dos.yml'),
+             os.path.join(self.wd, 'empty.yml'),
+             os.path.join(self.wd, 'en.yaml'),
+             os.path.join(self.wd, 's/s/s/s/s/s/s/s/s/s/s/s/s/s/s/file.yaml'),
+             os.path.join(self.wd, 'sub/directory.yaml/empty.yml'),
+             os.path.join(self.wd, 'sub/ok.yaml'),
+             os.path.join(self.wd, 'warn.yaml')]
+        )
+
+        config = '{ignore: "*.yml", yaml-files: ["*.*"]}'
+        with RunContext(self) as ctx:
+            cli.run(('--list-files', '-d', config, self.wd))
+        self.assertEqual(ctx.returncode, 0)
+        self.assertEqual(
+            sorted(ctx.stdout.splitlines()),
+            [os.path.join(self.wd, 'a.yaml'),
+             os.path.join(self.wd, 'c.yaml'),
+             os.path.join(self.wd, 'en.yaml'),
+             os.path.join(self.wd, 'no-yaml.json'),
+             os.path.join(self.wd, 's/s/s/s/s/s/s/s/s/s/s/s/s/s/s/file.yaml'),
+             os.path.join(self.wd, 'sub/directory.yaml/not-yaml.txt'),
+             os.path.join(self.wd, 'sub/ok.yaml'),
+             os.path.join(self.wd, 'warn.yaml')]
+        )
+
 
 class CommandLineConfigTestCase(unittest.TestCase):
     def test_config_file(self):

tests/test_config.py

@@ -369,7 +369,7 @@ class ExtendedConfigTestCase(unittest.TestCase):
         self.assertEqual(c.rules['colons']['max-spaces-before'], 0)
         self.assertEqual(c.rules['colons']['max-spaces-after'], 1)
 
-    def test_extended_ignore(self):
+    def test_extended_ignore_str(self):
         with tempfile.NamedTemporaryFile('w') as f:
             f.write('ignore: |\n'
                     '  *.template.yaml\n')
@@ -379,6 +379,16 @@ class ExtendedConfigTestCase(unittest.TestCase):
         self.assertEqual(c.ignore.match_file('test.template.yaml'), True)
         self.assertEqual(c.ignore.match_file('test.yaml'), False)
 
+    def test_extended_ignore_list(self):
+        with tempfile.NamedTemporaryFile('w') as f:
+            f.write('ignore:\n'
+                    '  - "*.template.yaml"\n')
+            f.flush()
+            c = config.YamlLintConfig('extends: ' + f.name + '\n')
+
+        self.assertEqual(c.ignore.match_file('test.template.yaml'), True)
+        self.assertEqual(c.ignore.match_file('test.yaml'), False)
+
 
 class ExtendedLibraryConfigTestCase(unittest.TestCase):
     def test_extend_config_disable_rule(self):
@@ -539,7 +549,7 @@ class IgnoreConfigTestCase(unittest.TestCase):
             './s/s/ign-trail/s/s/file2.lint-me-anyway.yaml:5:5: ' + hyphen,
         )))
 
-    def test_run_with_ignore(self):
+    def test_run_with_ignore_str(self):
         with open(os.path.join(self.wd, '.yamllint'), 'w') as f:
             f.write('extends: default\n'
                     'ignore: |\n'
@@ -593,6 +603,60 @@ class IgnoreConfigTestCase(unittest.TestCase):
             './s/s/ign-trail/s/s/file2.lint-me-anyway.yaml:5:5: ' + hyphen,
         )))
 
+    def test_run_with_ignore_list(self):
+        with open(os.path.join(self.wd, '.yamllint'), 'w') as f:
+            f.write('extends: default\n'
+                    'ignore:\n'
+                    '  - "*.dont-lint-me.yaml"\n'
+                    '  - "/bin/"\n'
+                    '  - "!/bin/*.lint-me-anyway.yaml"\n'
+                    'rules:\n'
+                    '  key-duplicates:\n'
+                    '    ignore:\n'
+                    '      - "/ign-dup"\n'
+                    '  trailing-spaces:\n'
+                    '    ignore:\n'
+                    '      - "ign-trail"\n'
+                    '      - "!*.lint-me-anyway.yaml"\n')
+
+        sys.stdout = StringIO()
+        with self.assertRaises(SystemExit):
+            cli.run(('-f', 'parsable', '.'))
+
+        out = sys.stdout.getvalue()
+        out = '\n'.join(sorted(out.splitlines()))
+
+        docstart = '[warning] missing document start "---" (document-start)'
+        keydup = '[error] duplication of key "key" in mapping (key-duplicates)'
+        trailing = '[error] trailing spaces (trailing-spaces)'
+        hyphen = '[error] too many spaces after hyphen (hyphens)'
+
+        self.assertEqual(out, '\n'.join((
+            './.yamllint:1:1: ' + docstart,
+            './bin/file.lint-me-anyway.yaml:3:3: ' + keydup,
+            './bin/file.lint-me-anyway.yaml:4:17: ' + trailing,
+            './bin/file.lint-me-anyway.yaml:5:5: ' + hyphen,
+            './file-at-root.yaml:3:3: ' + keydup,
+            './file-at-root.yaml:4:17: ' + trailing,
+            './file-at-root.yaml:5:5: ' + hyphen,
+            './ign-dup/file.yaml:4:17: ' + trailing,
+            './ign-dup/file.yaml:5:5: ' + hyphen,
+            './ign-dup/sub/dir/file.yaml:4:17: ' + trailing,
+            './ign-dup/sub/dir/file.yaml:5:5: ' + hyphen,
+            './ign-trail/file.yaml:3:3: ' + keydup,
+            './ign-trail/file.yaml:5:5: ' + hyphen,
+            './include/ign-dup/sub/dir/file.yaml:3:3: ' + keydup,
+            './include/ign-dup/sub/dir/file.yaml:4:17: ' + trailing,
+            './include/ign-dup/sub/dir/file.yaml:5:5: ' + hyphen,
+            './s/s/ign-trail/file.yaml:3:3: ' + keydup,
+            './s/s/ign-trail/file.yaml:5:5: ' + hyphen,
+            './s/s/ign-trail/s/s/file.yaml:3:3: ' + keydup,
+            './s/s/ign-trail/s/s/file.yaml:5:5: ' + hyphen,
+            './s/s/ign-trail/s/s/file2.lint-me-anyway.yaml:3:3: ' + keydup,
+            './s/s/ign-trail/s/s/file2.lint-me-anyway.yaml:4:17: ' + trailing,
+            './s/s/ign-trail/s/s/file2.lint-me-anyway.yaml:5:5: ' + hyphen,
+        )))
+
     def test_run_with_ignore_from_file(self):
         with open(os.path.join(self.wd, '.yamllint'), 'w') as f:
             f.write('extends: default\n'

tests/test_linter.py

@@ -31,10 +31,10 @@ class LinterTestCase(unittest.TestCase):
         linter.run(b'test: document', self.fake_config())
 
     def test_run_on_unicode(self):
-        linter.run(u'test: document', self.fake_config())
+        linter.run('test: document', self.fake_config())
 
     def test_run_on_stream(self):
-        linter.run(io.StringIO(u'hello'), self.fake_config())
+        linter.run(io.StringIO('hello'), self.fake_config())
 
     def test_run_on_int(self):
         self.assertRaises(TypeError, linter.run, 42, self.fake_config())
@@ -44,14 +44,14 @@ class LinterTestCase(unittest.TestCase):
                           ['h', 'e', 'l', 'l', 'o'], self.fake_config())
 
     def test_run_on_non_ascii_chars(self):
-        s = (u'- hétérogénéité\n'
+        s = ('- hétérogénéité\n'
-             u'# 19.99 €\n')
+             '# 19.99 €\n')
         linter.run(s, self.fake_config())
         linter.run(s.encode('utf-8'), self.fake_config())
         linter.run(s.encode('iso-8859-15'), self.fake_config())
 
-        s = (u'- お早う御座います。\n'
+        s = ('- お早う御座います。\n'
-             u'# الأَبْجَدِيَّة العَرَبِيَّة\n')
+             '# الأَبْجَدِيَّة العَرَبِيَّة\n')
         linter.run(s, self.fake_config())
         linter.run(s.encode('utf-8'), self.fake_config())
 

tests/test_spec_examples.py

@@ -13,7 +13,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from io import open
 import os
 
 from tests.common import RuleTestCase

yamllint/__init__.py

@@ -21,10 +21,10 @@ indentation, etc."""
 
 
 APP_NAME = 'yamllint'
-APP_VERSION = '1.28.0'
+APP_VERSION = '1.29.0'
 APP_DESCRIPTION = __doc__
 
-__author__ = u'Adrien Vergé'
+__author__ = 'Adrien Vergé'
-__copyright__ = u'Copyright 2022, Adrien Vergé'
+__copyright__ = 'Copyright 2022, Adrien Vergé'
 __license__ = 'GPLv3'
 __version__ = APP_VERSION

yamllint/cli.py

@@ -14,7 +14,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import argparse
-import io
 import locale
 import os
 import platform
@@ -47,7 +46,7 @@ def supports_color():
             hasattr(sys.stdout, 'isatty') and sys.stdout.isatty())
 
 
-class Format(object):
+class Format:
     @staticmethod
     def parsable(problem, filename):
         return ('%(file)s:%(line)s:%(column)s: [%(level)s] %(message)s' %
@@ -158,6 +157,8 @@ def run(argv=None):
     config_group.add_argument('-d', '--config-data', dest='config_data',
                               action='store',
                               help='custom configuration (as YAML source)')
+    parser.add_argument('--list-files', action='store_true', dest='list_files',
+                        help='list files to lint and exit')
     parser.add_argument('-f', '--format',
                         choices=('parsable', 'standard', 'colored', 'github',
                                  'auto'),
@@ -208,14 +209,20 @@ def run(argv=None):
     if conf.locale is not None:
         locale.setlocale(locale.LC_ALL, conf.locale)
 
+    if args.list_files:
+        for file in find_files_recursively(args.files, conf):
+            if not conf.is_file_ignored(file):
+                print(file)
+        sys.exit(0)
+
     max_level = 0
 
     for file in find_files_recursively(args.files, conf):
         filepath = file[2:] if file.startswith('./') else file
         try:
-            with io.open(file, newline='') as f:
+            with open(file, newline='') as f:
                 problems = linter.run(f, conf, filepath)
-        except EnvironmentError as e:
+        except OSError as e:
             print(e, file=sys.stderr)
             sys.exit(-1)
         prob_level = show_problems(problems, file, args_format=args.format,
@@ -226,7 +233,7 @@ def run(argv=None):
     if args.stdin:
         try:
             problems = linter.run(sys.stdin, conf, '')
-        except EnvironmentError as e:
+        except OSError as e:
             print(e, file=sys.stderr)
             sys.exit(-1)
         prob_level = show_problems(problems, 'stdin', args_format=args.format,

yamllint/config.py

@@ -112,11 +112,16 @@ class YamlLintConfig:
             with fileinput.input(conf['ignore-from-file']) as f:
                 self.ignore = pathspec.PathSpec.from_lines('gitwildmatch', f)
         elif 'ignore' in conf:
-            if not isinstance(conf['ignore'], str):
+            if isinstance(conf['ignore'], str):
-                raise YamlLintConfigError(
-                    'invalid config: ignore should contain file patterns')
                 self.ignore = pathspec.PathSpec.from_lines(
                     'gitwildmatch', conf['ignore'].splitlines())
+            elif (isinstance(conf['ignore'], list) and
+                    all(isinstance(line, str) for line in conf['ignore'])):
+                self.ignore = pathspec.PathSpec.from_lines(
+                    'gitwildmatch', conf['ignore'])
+            else:
+                raise YamlLintConfigError(
+                    'invalid config: ignore should contain file patterns')
 
         if 'yaml-files' in conf:
             if not (isinstance(conf['yaml-files'], list)
@@ -150,11 +155,16 @@ def validate_rule_conf(rule, conf):
     if isinstance(conf, dict):
         if ('ignore' in conf and
                 not isinstance(conf['ignore'], pathspec.pathspec.PathSpec)):
-            if not isinstance(conf['ignore'], str):
+            if isinstance(conf['ignore'], str):
-                raise YamlLintConfigError(
-                    'invalid config: ignore should contain file patterns')
                 conf['ignore'] = pathspec.PathSpec.from_lines(
                     'gitwildmatch', conf['ignore'].splitlines())
+            elif (isinstance(conf['ignore'], list) and
+                    all(isinstance(line, str) for line in conf['ignore'])):
+                conf['ignore'] = pathspec.PathSpec.from_lines(
+                    'gitwildmatch', conf['ignore'])
+            else:
+                raise YamlLintConfigError(
+                    'invalid config: ignore should contain file patterns')
 
         if 'level' not in conf:
             conf['level'] = 'error'

yamllint/linter.py

@@ -14,6 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import re
+import io
 
 import yaml
 
@@ -33,7 +34,7 @@ DISABLE_RULE_PATTERN = re.compile(r'^# yamllint disable( rule:\S+)*\s*$')
 ENABLE_RULE_PATTERN = re.compile(r'^# yamllint enable( rule:\S+)*\s*$')
 
 
-class LintProblem(object):
+class LintProblem:
     """Represents a linting problem found by yamllint."""
     def __init__(self, line, column, desc='<no description>', rule=None):
         #: Line on which the problem was found (starting at 1)
@@ -121,7 +122,7 @@ def get_cosmetic_problems(buffer, conf, filepath):
                         if id in self.all_rules:
                             self.rules.add(id)
 
-    # Use a cache to store problems and flush it only when a end of line is
+    # Use a cache to store problems and flush it only when an end of line is
     # found. This allows the use of yamllint directive to disable some rules on
     # some lines.
     cache = []
@@ -227,7 +228,7 @@ def run(input, conf, filepath=None):
 
     if isinstance(input, (bytes, str)):
         return _run(input, conf, filepath)
-    elif hasattr(input, 'read'):  # Python 2's file or Python 3's io.IOBase
+    elif isinstance(input, io.IOBase):
         # We need to have everything in memory to parse correctly
         content = input.read()
         return _run(content, conf, filepath)

yamllint/parser.py

@@ -132,8 +132,7 @@ def token_or_comment_generator(buffer):
 
             yield Token(curr.start_mark.line + 1, curr, prev, next, nextnext)
 
-            for comment in comments_between_tokens(curr, next):
+            yield from comments_between_tokens(curr, next)
-                yield comment
 
             prev = curr
             curr = next

yamllint/rules/comments_indentation.py

@@ -117,8 +117,7 @@ def check(conf, comment):
     #         # comment
     #         - 1
     #         - 2
-    if prev_line_indent <= next_line_indent:
+    prev_line_indent = max(prev_line_indent, next_line_indent)
-        prev_line_indent = next_line_indent
 
     # If two indents are valid but a previous comment went back to normal
     # indent, for the next ones to do the same. In other words, avoid this:

yamllint/rules/float_values.py

@@ -107,13 +107,13 @@ DEFAULT = {
 }
 
 IS_NUMERAL_BEFORE_DECIMAL_PATTERN = (
-    re.compile('[-+]?(\\.[0-9]+)([eE][-+]?[0-9]+)?')
+    re.compile('[-+]?(\\.[0-9]+)([eE][-+]?[0-9]+)?$')
 )
 IS_SCIENTIFIC_NOTATION_PATTERN = re.compile(
-    '[-+]?(\\.[0-9]+|[0-9]+(\\.[0-9]*)?)([eE][-+]?[0-9]+)'
+    '[-+]?(\\.[0-9]+|[0-9]+(\\.[0-9]*)?)([eE][-+]?[0-9]+)$'
 )
-IS_INF_PATTERN = re.compile('[-+]?(\\.inf|\\.Inf|\\.INF)')
+IS_INF_PATTERN = re.compile('[-+]?(\\.inf|\\.Inf|\\.INF)$')
-IS_NAN_PATTERN = re.compile('\\.nan|\\.NaN|\\.NAN')
+IS_NAN_PATTERN = re.compile('(\\.nan|\\.NaN|\\.NAN)$')
 
 
 def check(conf, token, prev, next, nextnext, context):

yamllint/rules/indentation.py

@@ -341,14 +341,18 @@ def _check(conf, token, prev, next, nextnext, context):
             expected = detect_indent(expected, token)
 
         if found_indentation != expected:
-            yield LintProblem(token.start_mark.line + 1, found_indentation + 1,
+            if expected < 0:
-                              'wrong indentation: expected %d but found %d' %
+                message = 'wrong indentation: expected at least %d' % \
-                              (expected, found_indentation))
+                          (found_indentation + 1)
+            else:
+                message = 'wrong indentation: expected %d but found %d' % \
+                          (expected, found_indentation)
+            yield LintProblem(token.start_mark.line + 1,
+                              found_indentation + 1, message)
 
     if (isinstance(token, yaml.ScalarToken) and
             conf['check-multi-line-strings']):
-        for problem in check_scalar_indentation(conf, token, context):
+        yield from check_scalar_indentation(conf, token, context)
-            yield problem
 
     # Step 2.a:
 
@@ -493,8 +497,8 @@ def _check(conf, token, prev, next, nextnext, context):
                         # indentation it should have (because `spaces` is
                         # `consistent` and its value has not been computed yet
                         # -- this is probably the beginning of the document).
-                        # So we choose an arbitrary value (2).
+                        # So we choose an unknown value (-1).
-                        indent = 2
+                        indent = -1
                     else:
                         indent = detect_indent(context['stack'][-1].indent,
                                                next)
@@ -576,8 +580,7 @@ def _check(conf, token, prev, next, nextnext, context):
 
 def check(conf, token, prev, next, nextnext, context):
     try:
-        for problem in _check(conf, token, prev, next, nextnext, context):
+        yield from _check(conf, token, prev, next, nextnext, context)
-            yield problem
     except AssertionError:
         yield LintProblem(token.start_mark.line + 1,
                           token.start_mark.column + 1,

yamllint/rules/key_ordering.py

@@ -93,7 +93,7 @@ TYPE = 'token'
 MAP, SEQ = range(2)
 
 
-class Parent(object):
+class Parent:
     def __init__(self, type):
         self.type = type
         self.keys = []

yamllint/rules/quoted_strings.py

@@ -166,7 +166,7 @@ def VALIDATE(conf):
         return 'cannot use both "required: false" and "extra-allowed"'
 
 
-DEFAULT_SCALAR_TAG = u'tag:yaml.org,2002:str'
+DEFAULT_SCALAR_TAG = 'tag:yaml.org,2002:str'
 
 # https://stackoverflow.com/a/36514274
 yaml.resolver.Resolver.add_implicit_resolver(
@@ -228,7 +228,7 @@ def check(conf, token, prev, next, nextnext, context):
         return
 
     # Ignore multi-line strings
-    if (not token.plain) and (token.style == "|" or token.style == ">"):
+    if not token.plain and token.style in ("|", ">"):
         return
 
     quote_type = conf['quote-type']

yamllint/rules/truthy.py

@@ -14,7 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 """
-Use this rule to forbid non-explictly typed truthy values other than allowed
+Use this rule to forbid non-explicitly typed truthy values other than allowed
 ones (by default: ``true`` and ``false``), for example ``YES`` or ``off``.
 
 This can be useful to prevent surprises from YAML parsers transforming