fix from review.

flake8_eradicate.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
-
+import ast
 import tokenize
-from typing import Iterable, Tuple
+from typing import Iterable, Tuple, Type
 
 import pkg_resources
 from eradicate import Eradicator
@@ -25,7 +25,15 @@ class Checker(object):
 
     options = None
 
-    def __init__(self, tree, filename: str):    # noqa: D107
+    def __init__(self, tree: ast.AST, filename: str):
+        """
+        ``flake8`` plugin constructor.
+
+        Arguments:
+            tree: the file abstract syntax tree.
+            filename: the name of the file to process
+
+        """
         self.filename = filename
 
         self._options = {
@@ -98,7 +106,7 @@ def parse_options(cls, options) -> None:
         """Parses registered options for providing them to each visitor."""
         cls.options = options
 
-    def run(self) -> Iterable[Tuple[int, str]]:
+    def run(self) -> Tuple[int, int, str, Type["Checker"]]:
         """Runs on each step of flake8."""
         for line_no in self._lines_with_commented_out_code():
             yield line_no, 0, self._error_template, type(self)

tests/test_comments.py

@@ -136,12 +136,12 @@ def test_lines_with_commented_out_code_incorrect_fixture_output(absolute_path):
 
     OptionsStub = namedtuple(
         'Options',
-        'eradicate_aggressive eradicate_whitelist eradicate_whitelist_extend'
+        'eradicate_aggressive eradicate_whitelist eradicate_whitelist_extend',
     )
     Checker.options = OptionsStub(
         eradicate_aggressive=True,
         eradicate_whitelist=False,
-        eradicate_whitelist_extend=False
+        eradicate_whitelist_extend=False,
     )
 
     checker = Checker(tree=None, filename=filename)