From 1c2560a1fa2ee5a755d4fef820383f3eafca1564 Mon Sep 17 00:00:00 2001
From: fawce <fawce@quantopian.com>
Date: Mon, 9 Feb 2015 12:23:46 -0500
Subject: [PATCH 1/4] added cutpoint for overriding SecurityList
 implementation.

---
 zipline/utils/security_list.py | 45 ++++++++++++++++++----------------
 1 file changed, 24 insertions(+), 21 deletions(-)

diff --git a/zipline/utils/security_list.py b/zipline/utils/security_list.py
index 4de9dbaf..417cef43 100644
--- a/zipline/utils/security_list.py
+++ b/zipline/utils/security_list.py
@@ -14,27 +14,6 @@ def loopback(symbol, *args, **kwargs):
     return symbol
 
 
-class SecurityListSet(object):
-
-    def __init__(self, current_date_func, lookup_func=None):
-        if lookup_func is None:
-            self.lookup_func = loopback
-        else:
-            self.lookup_func = lookup_func
-        self.current_date_func = current_date_func
-        self._leveraged_etf = None
-
-    @property
-    def leveraged_etf_list(self):
-        if self._leveraged_etf is None:
-            self._leveraged_etf = SecurityList(
-                self.lookup_func,
-                load_from_directory('leveraged_etf_list'),
-                self.current_date_func
-            )
-        return self._leveraged_etf
-
-
 class SecurityList(object):
 
     def __init__(self, lookup_func, data, current_date_func):
@@ -102,6 +81,30 @@ class SecurityList(object):
             change_func(sid)
 
 
+class SecurityListSet(object):
+
+    def __init__(self, current_date_func, lookup_func=None):
+        # provide a cut point to substitute other security
+        # list implementations.
+        self.sl_constructor = SecurityList
+        if lookup_func is None:
+            self.lookup_func = loopback
+        else:
+            self.lookup_func = lookup_func
+        self.current_date_func = current_date_func
+        self._leveraged_etf = None
+
+    @property
+    def leveraged_etf_list(self):
+        if self._leveraged_etf is None:
+            self._leveraged_etf = self.sl_constructor(
+                self.lookup_func,
+                load_from_directory('leveraged_etf_list'),
+                self.current_date_func
+            )
+        return self._leveraged_etf
+
+
 def load_from_directory(list_name):
     """
     To resolve the symbol in the LEVERAGED_ETF list,

From e3b21835f350c546948ed3205fc767e997e1f970 Mon Sep 17 00:00:00 2001
From: fawce <fawce@quantopian.com>
Date: Mon, 9 Feb 2015 12:27:30 -0500
Subject: [PATCH 2/4] name changed to protect the innocent

---
 zipline/utils/security_list.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/zipline/utils/security_list.py b/zipline/utils/security_list.py
index 417cef43..716f648f 100644
--- a/zipline/utils/security_list.py
+++ b/zipline/utils/security_list.py
@@ -86,7 +86,7 @@ class SecurityListSet(object):
     def __init__(self, current_date_func, lookup_func=None):
         # provide a cut point to substitute other security
         # list implementations.
-        self.sl_constructor = SecurityList
+        self.security_list_type = SecurityList
         if lookup_func is None:
             self.lookup_func = loopback
         else:
@@ -97,7 +97,7 @@ class SecurityListSet(object):
     @property
     def leveraged_etf_list(self):
         if self._leveraged_etf is None:
-            self._leveraged_etf = self.sl_constructor(
+            self._leveraged_etf = self.security_list_type(
                 self.lookup_func,
                 load_from_directory('leveraged_etf_list'),
                 self.current_date_func

From 67da7ca7a313e83a857679d3d74eb0d19819cb36 Mon Sep 17 00:00:00 2001
From: fawce <fawce@quantopian.com>
Date: Mon, 9 Feb 2015 12:54:50 -0500
Subject: [PATCH 3/4] import statement cleanup

---
 zipline/utils/security_list.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/zipline/utils/security_list.py b/zipline/utils/security_list.py
index 716f648f..8ad98585 100644
--- a/zipline/utils/security_list.py
+++ b/zipline/utils/security_list.py
@@ -1,11 +1,13 @@
-import os.path
-import pytz
-import pandas as pd
 from datetime import datetime
 from os import listdir
+import os.path
+
+import pandas as pd
+import pytz
+import zipline
+
 
 DATE_FORMAT = "%Y%m%d"
-import zipline
 zipline_dir = os.path.join(*zipline.__path__)
 SECURITY_LISTS_DIR = os.path.join(zipline_dir, 'resources', 'security_lists')
 

From 233bf3080d974f8af8a9edaf0d48e4f2b5cc0740 Mon Sep 17 00:00:00 2001
From: fawce <fawce@quantopian.com>
Date: Mon, 9 Feb 2015 13:32:01 -0500
Subject: [PATCH 4/4] security list type is a class level property now

---
 zipline/utils/security_list.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/zipline/utils/security_list.py b/zipline/utils/security_list.py
index 8ad98585..0cb24a4b 100644
--- a/zipline/utils/security_list.py
+++ b/zipline/utils/security_list.py
@@ -84,11 +84,11 @@ class SecurityList(object):
 
 
 class SecurityListSet(object):
+    # provide a cut point to substitute other security
+    # list implementations.
+    security_list_type = SecurityList
 
     def __init__(self, current_date_func, lookup_func=None):
-        # provide a cut point to substitute other security
-        # list implementations.
-        self.security_list_type = SecurityList
         if lookup_func is None:
             self.lookup_func = loopback
         else: