From a49bd4af4b1d5902db1c3a6ca83d7deed2fb5bb7 Mon Sep 17 00:00:00 2001
From: Eddie Hebert <ehebert@quantopian.com>
Date: Wed, 23 Jan 2013 17:17:35 -0500
Subject: [PATCH] Adds a contains method to SIDData to support `in` statement.

---
 zipline/protocol.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/zipline/protocol.py b/zipline/protocol.py
index dc235b98..0f9a0f1b 100644
--- a/zipline/protocol.py
+++ b/zipline/protocol.py
@@ -102,5 +102,8 @@ class SIDData(object):
     def __len__(self):
         return len(self.__dict__)
 
+    def __contains__(self, name):
+        return name in self.__dict__
+
     def __repr__(self):
         return "SIDData({0})".format(self.__dict__)