From f017218b64b46bfb850bac4f8664c11c71379936 Mon Sep 17 00:00:00 2001
From: Eddie Hebert <ehebert@quantopian.com>
Date: Mon, 21 Jan 2013 08:54:19 -0500
Subject: [PATCH] Uses class constants for message text instead of ndict.

Reducing use of ndict on the path to fixing a memory leak.

So that pulling an instance of ndict with objgraph is more likely
to be a use of ndict that is causing the leak.

Using a class level constant here suffices for the dot access
desired on messages.
---
 zipline/MESSAGES.py | 39 +++++++++++++++++++++------------------
 1 file changed, 21 insertions(+), 18 deletions(-)

diff --git a/zipline/MESSAGES.py b/zipline/MESSAGES.py
index 1a189cfc..2c67395b 100644
--- a/zipline/MESSAGES.py
+++ b/zipline/MESSAGES.py
@@ -1,37 +1,40 @@
-from zipline import ndict
+
+
 # ---------------------
 # Error Messages.
 # User facing.
 # ---------------------
 
-ERRORS = ndict({
+class ERRORS(object):
 
     # Raised if a user script calls the override_slippage magic
     # with a slipage object that isn't a VolumeShareSlippage or
     # FixedSlipapge
-    'UNSUPPORTED_SLIPPAGE_MODEL':
-    "You attempted to override slippage with an unsupported class. \
-    Please use VolumeShareSlippage or FixedSlippage.",
+    UNSUPPORTED_SLIPPAGE_MODEL = """
+You attempted to override slippage with an unsupported class. \
+Please use VolumeShareSlippage or FixedSlippage.
+""".strip()
 
     # Raised if a users script calls override_slippage magic
     # after the initialize method has returned.
-    'OVERRIDE_SLIPPAGE_POST_INIT':
-    "You attempted to override slippage after the simulation has \
-    started. You may only call override_slippage in your initialize \
-    method.",
+    OVERRIDE_SLIPPAGE_POST_INIT = """
+You attempted to override slippage after the simulation has \
+started. You may only call override_slippage in your initialize \
+method.
+""".strip()
 
     # Raised if a user script calls the override_commission magic
     # with a commission object that isn't a PerShare or
     # PerTrade commission
-    'UNSUPPORTED_COMMISSION_MODEL':
-    "You attempted to override commission with an unsupported class. \
-    Please use PerShare or PerTrade.",
+    UNSUPPORTED_COMMISSION_MODEL = """
+You attempted to override commission with an unsupported class. \
+Please use PerShare or PerTrade.
+""".strip()
 
     # Raised if a users script calls override_commission magic
     # after the initialize method has returned.
-    'OVERRIDE_COMMISSION_POST_INIT':
-    "You attempted to override commission after the simulation has \
-    started. You may only call override_commission in your initialize \
-    method.",
-
-})
+    OVERRIDE_COMMISSION_POST_INIT = """
+You attempted to override commission after the simulation has \
+started. You may only call override_commission in your initialize \
+method.
+""".strip()