comparison to None should be 'if cond is not None'

diff --git a/tornado/options.py b/tornado/options.py
index 8191946dfd84fa8d8b938348a9b3ce731c45c9c8..b65878028aeb85487838291e233ae4b7e0404a75 100644 (file)
--- a/tornado/options.py
+++ b/tornado/options.py
@@ -360,11 +360,11 @@ class _Option(object):
                 raise Error("Option %r is required to be a list of %s" %
                             (self.name, self.type.__name__))
             for item in value:
-                if item != None and not isinstance(item, self.type):
+                if item is not None and not isinstance(item, self.type):
                     raise Error("Option %r is required to be a list of %s" %
                                 (self.name, self.type.__name__))
         else:
-            if value != None and not isinstance(value, self.type):
+            if value is not None and not isinstance(value, self.type):
                 raise Error("Option %r is required to be a %s (%s given)" %
                             (self.name, self.type.__name__, type(value)))
         self._value = value