No need to define assert, it's built in.
diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py
index b9607ac..21012d2 100644
--- a/Lib/test/test_grammar.py
+++ b/Lib/test/test_grammar.py
@@ -83,8 +83,8 @@
 
 print '1.1.3 String literals'
 
-def assert(s):
-	if not s: raise TestFailed, 'see traceback'
+##def assert(s):
+##	if not s: raise TestFailed, 'see traceback'
 
 x = ''; y = ""; assert(len(x) == 0 and x == y)
 x = '\''; y = "'"; assert(len(x) == 1 and x == y and ord(x) == 39)