From de37a08c23ed8d4b92532c03699598b9dd95bde4 Mon Sep 17 00:00:00 2001
From: fawce <fawce@quantopian.com>
Date: Fri, 26 Apr 2013 19:57:45 -0400
Subject: [PATCH] MAINT: flake8 error

---
 zipline/gens/tradesimulation.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/zipline/gens/tradesimulation.py b/zipline/gens/tradesimulation.py
index d8d54a35..8859b1b7 100644
--- a/zipline/gens/tradesimulation.py
+++ b/zipline/gens/tradesimulation.py
@@ -15,7 +15,6 @@
 import itertools
 from itertools import chain
 from logbook import Logger, Processor
-from collections import defaultdict
 
 from zipline.protocol import BarData, DATASOURCE_TYPE
 from zipline.finance.performance import PerformanceTracker