diff --git a/syntax/python.vim b/syntax/python.vim
index 882d9e2..c0ea4e9 100644
--- a/syntax/python.vim
+++ b/syntax/python.vim
@@ -107,7 +107,7 @@ syn keyword pythonOperator      and in is not or
 if s:Enabled('g:python_highlight_operators')
     syn match pythonOperator        '\V=\|-\|+\|*\|@\|/\|%\|&\||\|^\|~\|<\|>\|!='
 endif
-syn match pythonError           '[$?]\|\([-+@%&|^~]\)\1\{1,}\|\([=*/<>]\)\2\{2,}\|\([-=+*@/%&|^~<>]\)\3\@![-+*@/%&|^~<>]\|[<!>]\+=\{2,}\|[<!>]\{2,}=\+' display
+syn match pythonError           '[$?]\|\([-+@%&|^~]\)\1\{1,}\|\([=*/<>]\)\2\{2,}\|\([-=+*@/%&|^~<>]\)\3\@![-+*@/%&|^~<>]\|[<!>]\+=\{2,}\|!\{2,}=\+' display
 
 "
 " Decorators (new in Python 2.4)
diff --git a/tests/test.py b/tests/test.py
index 12b8fc8..667ccb7 100644
--- a/tests/test.py
+++ b/tests/test.py
@@ -69,18 +69,22 @@ RuntimeWarning FutureWarning ImportWarning UnicodeWarning
 # Operators
 
 and or in is not
-=
+
 - + * ** @ / // %
 & | ^ ~ << >>
 < <= == != >= >
 
+=
+-= += *= **= @= /= //= %=
+&= |= ^= ~= <<= >>=
+
 # Erroneous operators
 
 $ ?
 ===
 -- ++ *** @@ /// %%
 && || ^^ ~~ <<< >>>
-<== <<= !== !!= >== >>=
+<== !== !!= >==
 %- +- -+
 
 # Numbers