diff --git a/catalyst/exchange/exchange.py b/catalyst/exchange/exchange.py
index 84d4b596..66a8e9b2 100644
--- a/catalyst/exchange/exchange.py
+++ b/catalyst/exchange/exchange.py
@@ -5,6 +5,7 @@ from time import sleep
 
 import numpy as np
 import pandas as pd
+
 from catalyst.constants import LOG_LEVEL
 from catalyst.data.data_portal import BASE_FIELDS
 from catalyst.exchange.exchange_bundle import ExchangeBundle
@@ -20,6 +21,7 @@ from catalyst.exchange.utils.exchange_utils import \
     resample_history_df, has_bundle
 from logbook import Logger
 
+
 log = Logger('Exchange', level=LOG_LEVEL)