Update the code to better reflect recommended style:

Use != instead of <> since <> is documented as "obsolescent".
Use "is" and "is not" when comparing with None or type objects.
diff --git a/Lib/plat-irix5/panelparser.py b/Lib/plat-irix5/panelparser.py
index 1b069fa..ee50971 100755
--- a/Lib/plat-irix5/panelparser.py
+++ b/Lib/plat-irix5/panelparser.py
@@ -71,7 +71,7 @@
 # May raise syntax_error.
 #
 def parse_expr(tokens):
-	if (not tokens) or tokens[0] <> '(':
+	if (not tokens) or tokens[0] != '(':
 		raise syntax_error, 'expected "("'
 	tokens = tokens[1:]
 	expr = []