Merge pull request #1307 from PyCQA/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

9 files changed, 94 insertions, 78 deletions

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index eb4ff62..c676e5c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,7 +1,7 @@
 exclude: ^tests/fixtures/example-code/
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.3.0
+    rev: v3.4.0
     hooks:
     -   id: check-yaml
     -   id: debug-statements
@@ -26,7 +26,7 @@ repos:
     -   id: pyupgrade
         args: [--py36-plus]
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.720
+    rev: v0.812
     hooks:
     -   id: mypy
         exclude: ^(docs/|example-plugin/|tests/fixtures)
diff --git a/src/flake8/checker.py b/src/flake8/checker.py
index 2e4f0b8..6f8c0c1 100644
--- a/src/flake8/checker.py
+++ b/src/flake8/checker.py
@@ -40,11 +40,7 @@ SERIAL_RETRY_ERRNOS = {
 
 def _multiprocessing_is_fork():  # type () -> bool
     """Class state is only preserved when using the `fork` strategy."""
-    return (
-        multiprocessing
-        # https://github.com/python/typeshed/pull/3415
-        and multiprocessing.get_start_method() == "fork"  # type: ignore
-    )
+    return multiprocessing and multiprocessing.get_start_method() == "fork"
 
 
 class Manager:
@@ -396,7 +392,7 @@ class FileChecker:
 
         # If we're recovering from a problem in _make_processor, we will not
         # have this attribute.
-        if hasattr(self, "processor"):
+        if hasattr(self, "processor") and self.processor is not None:
             line = self.processor.noqa_line_for(line_number)
         else:
             line = None
@@ -407,6 +403,7 @@ class FileChecker:
     def run_check(self, plugin, **arguments):
         """Run the check in a single plugin."""
         LOG.debug("Running %r with %r", plugin, arguments)
+        assert self.processor is not None
         try:
             self.processor.keyword_arguments_for(
                 plugin["parameters"], arguments
@@ -467,6 +464,7 @@ class FileChecker:
 
     def run_ast_checks(self) -> None:
         """Run all checks expecting an abstract syntax tree."""
+        assert self.processor is not None
         try:
             ast = self.processor.build_ast()
         except (ValueError, SyntaxError, TypeError) as e:
@@ -494,6 +492,7 @@ class FileChecker:
 
     def run_logical_checks(self):
         """Run all checks expecting a logical line."""
+        assert self.processor is not None
         comments, logical_line, mapping = self.processor.build_logical_line()
         if not mapping:
             return
@@ -522,6 +521,7 @@ class FileChecker:
 
         A single physical check may return multiple errors.
         """
+        assert self.processor is not None
         for plugin in self.checks["physical_line_plugins"]:
             self.processor.update_checker_state_for(plugin)
             result = self.run_check(plugin, physical_line=physical_line)
@@ -554,6 +554,7 @@ class FileChecker:
         Instead of using this directly, you should use
         :meth:`flake8.checker.FileChecker.run_checks`.
         """
+        assert self.processor is not None
         parens = 0
         statistics = self.statistics
         file_processor = self.processor
@@ -577,6 +578,7 @@ class FileChecker:
 
     def run_checks(self):
         """Run checks against the file."""
+        assert self.processor is not None
         try:
             self.process_tokens()
             self.run_ast_checks()
@@ -594,6 +596,7 @@ class FileChecker:
 
     def handle_newline(self, token_type):
         """Handle the logic when encountering a newline token."""
+        assert self.processor is not None
         if token_type == tokenize.NEWLINE:
             self.run_logical_checks()
             self.processor.reset_blank_before()
@@ -608,6 +611,7 @@ class FileChecker:
         self, token: processor._Token, prev_physical: str
     ) -> None:
         """Run physical checks if and only if it is at the end of the line."""
+        assert self.processor is not None
         # a newline token ends a single physical line.
         if processor.is_eol_token(token):
             # if the file does not end with a newline, the NEWLINE
diff --git a/src/flake8/main/application.py b/src/flake8/main/application.py
index 6e99ec2..44a5524 100644
--- a/src/flake8/main/application.py
+++ b/src/flake8/main/application.py
@@ -44,7 +44,7 @@ class Application:
         #: The timestamp when the Application instance was instantiated.
         self.start_time = time.time()
         #: The timestamp when the Application finished reported errors.
-        self.end_time: float = None
+        self.end_time: Optional[float] = None
         #: The name of the program being run
         self.program = program
         #: The version of the program being run
@@ -63,24 +63,26 @@ class Application:
         options.register_default_options(self.option_manager)
 
         #: The instance of :class:`flake8.plugins.manager.Checkers`
-        self.check_plugins: plugin_manager.Checkers = None
+        self.check_plugins: Optional[plugin_manager.Checkers] = None
         #: The instance of :class:`flake8.plugins.manager.ReportFormatters`
-        self.formatting_plugins: plugin_manager.ReportFormatters = None
+        self.formatting_plugins: Optional[
+            plugin_manager.ReportFormatters
+        ] = None
         #: The user-selected formatter from :attr:`formatting_plugins`
-        self.formatter: BaseFormatter = None
+        self.formatter: Optional[BaseFormatter] = None
         #: The :class:`flake8.style_guide.StyleGuideManager` built from the
         #: user's options
-        self.guide: style_guide.StyleGuideManager = None
+        self.guide: Optional[style_guide.StyleGuideManager] = None
         #: The :class:`flake8.checker.Manager` that will handle running all of
         #: the checks selected by the user.
-        self.file_checker_manager: checker.Manager = None
+        self.file_checker_manager: Optional[checker.Manager] = None
 
         #: The user-supplied options parsed into an instance of
         #: :class:`argparse.Namespace`
-        self.options: argparse.Namespace = None
+        self.options: Optional[argparse.Namespace] = None
         #: The left over arguments that were not parsed by
         #: :attr:`option_manager`
-        self.args: List[str] = None
+        self.args: Optional[List[str]] = None
         #: The number of errors, warnings, and other messages after running
         #: flake8 and taking into account ignored errors and lines.
         self.result_count = 0
@@ -128,6 +130,7 @@ class Application:
         This should be the last thing called on the application instance. It
         will check certain options and exit appropriately.
         """
+        assert self.options is not None
         if self.options.count:
             print(self.result_count)
 
@@ -162,8 +165,10 @@ class Application:
 
     def register_plugin_options(self) -> None:
         """Register options provided by plugins to our option manager."""
+        assert self.check_plugins is not None
         self.check_plugins.register_options(self.option_manager)
         self.check_plugins.register_plugin_versions(self.option_manager)
+        assert self.formatting_plugins is not None
         self.formatting_plugins.register_options(self.option_manager)
 
     def parse_configuration_and_cli(
@@ -190,15 +195,18 @@ class Application:
             if not self.parsed_diff:
                 self.exit()
 
+        assert self.check_plugins is not None
         self.check_plugins.provide_options(
             self.option_manager, self.options, self.args
         )
+        assert self.formatting_plugins is not None
         self.formatting_plugins.provide_options(
             self.option_manager, self.options, self.args
         )
 
     def formatter_for(self, formatter_plugin_name):
         """Retrieve the formatter class by plugin name."""
+        assert self.formatting_plugins is not None
         default_formatter = self.formatting_plugins["default"]
         formatter_plugin = self.formatting_plugins.get(formatter_plugin_name)
         if formatter_plugin is None:
@@ -214,6 +222,7 @@ class Application:
         self, formatter_class: Optional[Type["BaseFormatter"]] = None
     ) -> None:
         """Initialize a formatter based on the parsed options."""
+        assert self.options is not None
         format_plugin = self.options.format
         if 1 <= self.options.quiet < 2:
             format_plugin = "quiet-filename"
@@ -227,6 +236,8 @@ class Application:
 
     def make_guide(self) -> None:
         """Initialize our StyleGuide."""
+        assert self.formatter is not None
+        assert self.options is not None
         self.guide = style_guide.StyleGuideManager(
             self.options, self.formatter
         )
@@ -252,6 +263,7 @@ class Application:
         :param list files:
             List of filenames to process
         """
+        assert self.file_checker_manager is not None
         if self.running_against_diff:
             files = sorted(self.parsed_diff)
         self.file_checker_manager.start(files)
@@ -267,9 +279,12 @@ class Application:
 
     def report_benchmarks(self):
         """Aggregate, calculate, and report benchmarks for this run."""
+        assert self.options is not None
         if not self.options.benchmark:
             return
 
+        assert self.file_checker_manager is not None
+        assert self.end_time is not None
         time_elapsed = self.end_time - self.start_time
         statistics = [("seconds elapsed", time_elapsed)]
         add_statistic = statistics.append
@@ -280,6 +295,7 @@ class Application:
             per_second_description = f"{statistic} processed per second"
             add_statistic((per_second_description, int(value / time_elapsed)))
 
+        assert self.formatter is not None
         self.formatter.show_benchmarks(statistics)
 
     def report_errors(self) -> None:
@@ -289,6 +305,7 @@ class Application:
         number of errors, warnings, and other messages found.
         """
         LOG.info("Reporting errors")
+        assert self.file_checker_manager is not None
         results = self.file_checker_manager.report()
         self.total_result_count, self.result_count = results
         LOG.info(
@@ -299,9 +316,12 @@ class Application:
 
     def report_statistics(self):
         """Aggregate and report statistics from this run."""
+        assert self.options is not None
         if not self.options.statistics:
             return
 
+        assert self.formatter is not None
+        assert self.guide is not None
         self.formatter.show_statistics(self.guide.stats)
 
     def initialize(self, argv: List[str]) -> None:
@@ -332,6 +352,7 @@ class Application:
 
     def report(self):
         """Report errors, statistics, and benchmarks."""
+        assert self.formatter is not None
         self.formatter.start()
         self.report_errors()
         self.report_statistics()
diff --git a/src/flake8/plugins/manager.py b/src/flake8/plugins/manager.py
index a7f285a..3779b20 100644
--- a/src/flake8/plugins/manager.py
+++ b/src/flake8/plugins/manager.py
@@ -251,7 +251,9 @@ class PluginManager:  # pylint: disable=too-few-public-methods
         for plugin_str in local_plugins:
             name, _, entry_str = plugin_str.partition("=")
             name, entry_str = name.strip(), entry_str.strip()
-            entry_point = importlib_metadata.EntryPoint(name, entry_str, None)
+            entry_point = importlib_metadata.EntryPoint(
+                name, entry_str, self.namespace
+            )
             self._load_plugin_from_entrypoint(entry_point, local=True)
 
     def _load_entrypoint_plugins(self):
diff --git a/src/flake8/style_guide.py b/src/flake8/style_guide.py
index c35c739..5c91be8 100644
--- a/src/flake8/style_guide.py
+++ b/src/flake8/style_guide.py
@@ -54,20 +54,19 @@ def find_noqa(physical_line: str) -> Optional[Match[str]]:
     return defaults.NOQA_INLINE_REGEXP.search(physical_line)
 
 
-_Violation = collections.namedtuple(
-    "Violation",
-    [
-        "code",
-        "filename",
-        "line_number",
-        "column_number",
-        "text",
-        "physical_line",
-    ],
-)
-
-
-class Violation(_Violation):
+class Violation(
+    collections.namedtuple(
+        "Violation",
+        [
+            "code",
+            "filename",
+            "line_number",
+            "column_number",
+            "text",
+            "physical_line",
+        ],
+    )
+):
     """Class representing a violation reported by Flake8."""
 
     def is_inline_ignored(self, disable_noqa: bool) -> bool:
diff --git a/src/flake8/utils.py b/src/flake8/utils.py
index fe5d907..c5c134e 100644
--- a/src/flake8/utils.py
+++ b/src/flake8/utils.py
@@ -57,7 +57,7 @@ def parse_comma_separated_list(
     return [item for item in item_gen if item]
 
 
-_Token = collections.namedtuple("Token", ("tp", "src"))
+_Token = collections.namedtuple("_Token", ("tp", "src"))
 _CODE, _FILE, _COLON, _COMMA, _WS = "code", "file", "colon", "comma", "ws"
 _EOF = "eof"
 _FILE_LIST_TOKEN_TYPES = [
diff --git a/tests/integration/test_plugins.py b/tests/integration/test_plugins.py
index 1b6203e..867a94e 100644
--- a/tests/integration/test_plugins.py
+++ b/tests/integration/test_plugins.py
@@ -41,7 +41,9 @@ def test_enable_local_plugin_from_config():
     app = application.Application()
     app.initialize(['flake8', '--config', LOCAL_PLUGIN_CONFIG])
 
+    assert app.check_plugins is not None
     assert app.check_plugins['XE'].plugin is ExtensionTestPlugin
+    assert app.formatting_plugins is not None
     assert app.formatting_plugins['XR'].plugin is ReportTestPlugin
 
 
@@ -51,6 +53,7 @@ def test_local_plugin_can_add_option():
     app.initialize(
         ['flake8', '--config', LOCAL_PLUGIN_CONFIG, '--anopt', 'foo'])
 
+    assert app.options is not None
     assert app.options.anopt == 'foo'
 
 
@@ -59,4 +62,5 @@ def test_enable_local_plugin_at_non_installed_path():
     app = application.Application()
     app.initialize(['flake8', '--config', LOCAL_PLUGIN_PATH_CONFIG])
 
+    assert app.check_plugins is not None
     assert app.check_plugins['XE'].plugin.name == 'ExtensionTestPlugin2'
diff --git a/tests/unit/test_exceptions.py b/tests/unit/test_exceptions.py
index 0254cb2..89490fa 100644
--- a/tests/unit/test_exceptions.py
+++ b/tests/unit/test_exceptions.py
@@ -1,48 +1,34 @@
 """Tests for the flake8.exceptions module."""
 import pickle
 
-from flake8 import exceptions
-
-
-class _ExceptionTest:
-    def test_pickleable(self):
-        """Test that the exception is round-trip pickleable."""
-        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
-            new_err = pickle.loads(pickle.dumps(self.err, protocol=proto))
-            assert str(self.err) == str(new_err)
-            orig_e = self.err.original_exception
-            new_e = new_err.original_exception
-            assert (type(orig_e), orig_e.args) == (type(new_e), new_e.args)
-
-
-class TestFailedToLoadPlugin(_ExceptionTest):
-    """Tests for the FailedToLoadPlugin exception."""
-
-    err = exceptions.FailedToLoadPlugin(
-        plugin_name='plugin_name',
-        exception=ValueError('boom!'),
-    )
-
-
-class TestInvalidSyntax(_ExceptionTest):
-    """Tests for the InvalidSyntax exception."""
-
-    err = exceptions.InvalidSyntax(exception=ValueError('Unexpected token: $'))
-
-
-class TestPluginRequestedUnknownParameters(_ExceptionTest):
-    """Tests for the PluginRequestedUnknownParameters exception."""
-
-    err = exceptions.PluginRequestedUnknownParameters(
-        plugin={'plugin_name': 'plugin_name'},
-        exception=ValueError('boom!'),
-    )
+import pytest
 
+from flake8 import exceptions
 
-class TestPluginExecutionFailed(_ExceptionTest):
-    """Tests for the PluginExecutionFailed exception."""
 
-    err = exceptions.PluginExecutionFailed(
-        plugin={'plugin_name': 'plugin_name'},
-        exception=ValueError('boom!'),
-    )
+@pytest.mark.parametrize(
+    'err',
+    (
+        exceptions.FailedToLoadPlugin(
+            plugin_name='plugin_name',
+            exception=ValueError('boom!'),
+        ),
+        exceptions.InvalidSyntax(exception=ValueError('Unexpected token: $')),
+        exceptions.PluginRequestedUnknownParameters(
+            plugin={'plugin_name': 'plugin_name'},
+            exception=ValueError('boom!'),
+        ),
+        exceptions.PluginExecutionFailed(
+            plugin={'plugin_name': 'plugin_name'},
+            exception=ValueError('boom!'),
+        )
+    ),
+)
+def test_pickleable(err):
+    """Ensure that our exceptions can cross pickle boundaries."""
+    for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+        new_err = pickle.loads(pickle.dumps(err, protocol=proto))
+        assert str(err) == str(new_err)
+        orig_e = err.original_exception
+        new_e = new_err.original_exception
+        assert (type(orig_e), orig_e.args) == (type(new_e), new_e.args)
diff --git a/tests/unit/test_plugin_manager.py b/tests/unit/test_plugin_manager.py
index 55c3e24..6f95a72 100644
--- a/tests/unit/test_plugin_manager.py
+++ b/tests/unit/test_plugin_manager.py
@@ -18,8 +18,8 @@ def test_calls_entrypoints_creates_plugins_automaticaly(entry_points_mck):
     """Verify that we create Plugins on instantiation."""
     entry_points_mck.return_value = {
         'testing.entrypoints': [
-            importlib_metadata.EntryPoint('T100', '', None),
-            importlib_metadata.EntryPoint('T200', '', None),
+            importlib_metadata.EntryPoint('T100', '', 'testing.entrypoints'),
+            importlib_metadata.EntryPoint('T200', '', 'testing.entrypoints'),
         ],
     }
     plugin_mgr = manager.PluginManager(namespace='testing.entrypoints')
@@ -36,8 +36,8 @@ def test_handles_mapping_functions_across_plugins(entry_points_mck):
     """Verify we can use the PluginManager call functions on all plugins."""
     entry_points_mck.return_value = {
         'testing.entrypoints': [
-            importlib_metadata.EntryPoint('T100', '', None),
-            importlib_metadata.EntryPoint('T200', '', None),
+            importlib_metadata.EntryPoint('T100', '', 'testing.entrypoints'),
+            importlib_metadata.EntryPoint('T200', '', 'testing.entrypoints'),
         ],
     }
     plugin_mgr = manager.PluginManager(namespace='testing.entrypoints')