From 39895aae46a2a4b665fc85a3747f2fafd27441fa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Susannah=20Klane=C4=8Dek?= <suzil@protonmail.ch>
Date: Fri, 1 May 2020 12:40:11 -0400
Subject: [PATCH] Handle

---
 pycodestyle.py   | 4 ++--
 testsuite/E71.py | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/pycodestyle.py b/pycodestyle.py
index b1fb8a74..d9682b8f 100755
--- a/pycodestyle.py
+++ b/pycodestyle.py
@@ -140,8 +140,8 @@ def lru_cache(maxsize=128):  # noqa as it's a fake implementation.
 WHITESPACE_AFTER_COMMA_REGEX = re.compile(r'[,;:]\s*(?:  |\t)')
 COMPARE_SINGLETON_REGEX = re.compile(r'(\bNone|\bFalse|\bTrue)?\s*([=!]=)'
                                      r'\s*(?(1)|(None|False|True))\b')
-COMPARE_NEGATIVE_REGEX = re.compile(r'\b(not)\s+[^][)(}{ ]+\s+(in|is)'
-                                    r'\s+(?!not\s)')
+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.\w+Type'
                                 r'|\s*\(\s*([^)]*[^ )])\s*\))')
 KEYWORD_REGEX = re.compile(r'(\s*)\b(?:%s)\b(\s*)' % r'|'.join(KEYWORDS))
diff --git a/testsuite/E71.py b/testsuite/E71.py
index e7f88697..abf4e7a8 100644
--- a/testsuite/E71.py
+++ b/testsuite/E71.py
@@ -67,6 +67,9 @@
 #: E714
 if not X is Y is not Z:
     pass
+#: E714
+if not X is not Y:
+    pass
 
 #
 #: Okay