Add tests for the E721 check

Author: florentx

pep8.py

@@ -99,8 +99,8 @@
 EXTRANEOUS_WHITESPACE_REGEX = re.compile(r'[[({] | []}),;:]')
 WHITESPACE_AFTER_COMMA_REGEX = re.compile(r'[,;:]\s*(?:  |\t)')
 COMPARE_SINGLETON_REGEX = re.compile(r'([=!]=)\s*(None|False|True)')
-COMPARE_TYPE_REGEX = re.compile(r'([=!]=|is|is\s+not)\s*type(?:s\.(\w+)Type'
-                                r'|\(\s*(\(\s*\)|[^)]*[^ )])\s*\))')
+COMPARE_TYPE_REGEX = re.compile(r'(?:[=!]=|is(?:\s+not)?)\s*type(?:s.\w+Type'
+                                r'|\s*\(\s*([^)]*[^ )])\s*\))')
 KEYWORD_REGEX = re.compile(r'(\s*)\b(?:%s)\b(\s*)' % r'|'.join(KEYWORDS))
 OPERATOR_REGEX = re.compile(r'(?:[^,\s])(\s*)(?:[-+*/|!<=>%&^]+)(\s*)')
 LAMBDA_REGEX = re.compile(r'\blambda\b')
@@ -945,10 +945,10 @@ def comparison_type(logical_line):
     """
     match = COMPARE_TYPE_REGEX.search(logical_line)
     if match:
-        inst = match.group(3)
+        inst = match.group(1)
         if inst and isidentifier(inst) and inst not in SINGLETONS:
             return  # Allow comparison for types which are not obvious
-        yield match.start(1), "E721 do not compare types, use 'isinstance()'"
+        yield match.start(0), "E721 do not compare types, use 'isinstance()'"
 
 
 def python_3000_has_key(logical_line):

testsuite/E72.py

@@ -14,6 +14,30 @@
 
 if type(res) is not types.ListType:
     pass
+#: E721
+assert type(res) == type(False) or type(res) == type(None)
+#: E721
+assert type(res) == type([])
+#: E721
+assert type(res) == type(())
+#: E721
+assert type(res) == type((0,))
+#: E721
+assert type(res) == type((0))
+#: E721
+assert type(res) != type((1, ))
+#: E721
+assert type(res) is type((1, ))
+#: E721
+assert type(res) is not type((1, ))
+#: E211 E721
+assert type(res) == type ([2, ])
+#: E201 E202 E721
+assert type(res) == type( ( ) )
+#: E201 E202 E721
+assert type(res) == type( (0, ) )
+#:
+
 #: Okay
 import types