allow is and is not for type compares

Author: asottile

pycodestyle.py

@@ -129,8 +129,8 @@
 COMPARE_NEGATIVE_REGEX = re.compile(r'\b(?<!is\s)(not)\s+[^][)(}{ ]+\s+'
                                     r'(in|is)\s')
 COMPARE_TYPE_REGEX = re.compile(
-    r'(?:[=!]=|is(?:\s+not)?)\s+type(?:\s*\(\s*([^)]*[^ )])\s*\))' +
-    r'|\btype(?:\s*\(\s*([^)]*[^ )])\s*\))\s+(?:[=!]=|is(?:\s+not)?)'
+    r'[=!]=\s+type(?:\s*\(\s*([^)]*[^ )])\s*\))'
+    r'|\btype(?:\s*\(\s*([^)]*[^ )])\s*\))\s+[=!]='
 )
 KEYWORD_REGEX = re.compile(r'(\s*)\b(?:%s)\b(\s*)' % r'|'.join(KEYWORDS))
 OPERATOR_REGEX = re.compile(r'(?:[^,\s])(\s*)(?:[-+*/|!<=>%&^]+|:=)(\s*)')
@@ -1459,7 +1459,7 @@ def comparison_type(logical_line, noqa):
     Do not compare types directly.
 
     Okay: if isinstance(obj, int):
-    E721: if type(obj) is type(1):
+    E721: if type(obj) == type(1):
     """
     match = COMPARE_TYPE_REGEX.search(logical_line)
     if match and not noqa:

testsuite/E72.py

@@ -9,7 +9,7 @@
 
 if res == types.IntType:
     pass
-#: E721
+#: Okay
 import types
 
 if type(res) is not types.ListType:
@@ -26,9 +26,9 @@
 assert type(res) == type((0))
 #: E721
 assert type(res) != type((1, ))
-#: E721
+#: Okay
 assert type(res) is type((1, ))
-#: E721
+#: Okay
 assert type(res) is not type((1, ))
 #: E211 E721
 assert type(res) == type ([2, ])