From 23ff65ad32a16a8efff48e2118a4ff81e831cb9f Mon Sep 17 00:00:00 2001
From: Eddie Hebert <ehebert@quantopian.com>
Date: Tue, 9 Apr 2013 11:59:28 -0400
Subject: [PATCH] MAINT: Convert per share cost to float during init.

The cost value should always be a float.
The per share calculation shouldn't be changed dramatically by being
a float, (except for potential rounding errors), but change to so
that PerShare and PerTrade are aligned.
 # Please enter the commit message for your changes. Lines starting
---
 zipline/finance/commission.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/zipline/finance/commission.py b/zipline/finance/commission.py
index b7737f05..58a3df3e 100644
--- a/zipline/finance/commission.py
+++ b/zipline/finance/commission.py
@@ -26,7 +26,7 @@ class PerShare(object):
         means three cents per share, which is a very conservative
         (quite high) for per share costs.
         """
-        self.cost = cost
+        self.cost = float(cost)
 
     def calculate(self, transaction):
         """