Check for 'is' and 'in' as well

Author: adamchainz

pycodestyle.py

@@ -120,7 +120,7 @@ def lru_cache(maxsize=128):  # noqa as it's a fake implementation.
 WS_NEEDED_OPERATORS = frozenset([
     '**=', '*=', '/=', '//=', '+=', '-=', '!=', '<>', '<', '>',
     '%=', '^=', '&=', '|=', '==', '<=', '>=', '<<=', '>>=', '=',
-    'and', 'or'] +
+    'and', 'in', 'is', 'or'] +
     FUNCTION_RETURN_ANNOTATION_OP)
 WHITESPACE = frozenset(' \t')
 NEWLINE = frozenset([tokenize.NL, tokenize.NEWLINE])

testsuite/E22.py

@@ -80,6 +80,10 @@
 i = 1and 1
 #: E225
 i = 1or 0
+#: E225
+1is 1
+#: E225
+1in []
 #: E225 E226
 i=i+1
 #: E225 E226