avoid lib2to3

autopep8.py

@@ -86,6 +86,7 @@ class documentation for more information.
 import ast
 from configparser import ConfigParser as SafeConfigParser, Error
 
+import chardet
 import pycodestyle
 
 
@@ -4523,14 +4524,12 @@ def is_python_file(filename):
         return True
 
     try:
-        with open_with_encoding(
-                filename,
-                limit_byte_check=MAX_PYTHON_FILE_DETECTION_BYTES) as f:
+        with open_with_encoding(filename) as f:
             text = f.read(MAX_PYTHON_FILE_DETECTION_BYTES)
             if not text:
                 return False
             first_line = text.splitlines()[0]
-    except (IOError, IndexError):
+    except (IOError, IndexError, UnicodeDecodeError):
         return False
 
     if not PYTHON_SHEBANG_REGEX.match(first_line):

setup.py

@@ -10,7 +10,7 @@
 
 
 INSTALL_REQUIRES = (
-    ['pycodestyle >= 2.8.0', 'toml']
+    ['pycodestyle >= 2.8.0', 'toml', 'chardet']
 )
 
 
@@ -30,7 +30,7 @@ def version():
                     'to the PEP 8 style guide',
         long_description=readme.read(),
         license='Expat License',
-        author='Hideo Hattori',
+        author='Hideo Hattoriは',
         author_email='hhatto.jp@gmail.com',
         url='https://github.com/hhatto/autopep8',
         classifiers=[

test/iso_8859_1.py

@@ -1 +1,3 @@
 # -*- coding: iso-8859-1 -*-
+
+s = "¿¿¿¿¿"

test/test_autopep8.py

@@ -82,7 +82,7 @@ def test_detect_encoding(self):
 
     def test_detect_encoding_with_cookie(self):
         self.assertEqual(
-            'iso-8859-1',
+            'ISO-8859-1',
             autopep8.detect_encoding(
                 os.path.join(ROOT_DIR, 'test', 'iso_8859_1.py')))