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.

Lib/Cookie.py

@@ -489,7 +489,7 @@ class Morsel(UserDict):
         RA("%s=%s;" % (self.key, self.coded_value))
 
         # Now add any defined attributes
-        if attrs == None:
+        if attrs is None:
             attrs = self._reserved_keys
         for K,V in self.items():
             if V == "": continue