diff options
| -rw-r--r-- | pyramid/request.py | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/pyramid/request.py b/pyramid/request.py index 7e8b8c07d..fa35dc5f4 100644 --- a/pyramid/request.py +++ b/pyramid/request.py @@ -32,8 +32,8 @@ class TemplateContext(object): pass class CallbackMethodsMixin(object): - response_callbacks = () - finished_callbacks = () + response_callbacks = None + finished_callbacks = None def add_response_callback(self, callback): """ Add a callback to the set of callbacks to be called by the @@ -72,7 +72,7 @@ class CallbackMethodsMixin(object): """ callbacks = self.response_callbacks - if callbacks == (): + if callbacks is None: callbacks = [] callbacks.append(callback) self.response_callbacks = callbacks @@ -132,7 +132,7 @@ class CallbackMethodsMixin(object): """ callbacks = self.finished_callbacks - if callbacks == (): + if callbacks is None: callbacks = [] callbacks.append(callback) self.finished_callbacks = callbacks |