From cf6ec9fd73e69fef61d1d7df29ed7f5a9071efe4 Mon Sep 17 00:00:00 2001
From: Richard Frank <rich@quantopian.com>
Date: Tue, 23 Aug 2016 16:21:20 -0400
Subject: [PATCH] BUG: More python3 compat

---
 zipline/data/bundles/core.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/zipline/data/bundles/core.py b/zipline/data/bundles/core.py
index 00c30a4e..7bb1b2f8 100644
--- a/zipline/data/bundles/core.py
+++ b/zipline/data/bundles/core.py
@@ -7,6 +7,7 @@ import warnings
 from contextlib2 import ExitStack
 import click
 import pandas as pd
+from six import string_types
 from toolz import curry, complement, take
 
 from ..us_equity_pricing import (
@@ -295,7 +296,7 @@ def _make_bundle_core():
                 stacklevel=3,
             )
 
-        if isinstance(calendar, str):
+        if isinstance(calendar, string_types):
             calendar = get_calendar(calendar)
 
         # If the start and end sessions are not provided or lie outside