Fixed bundle imports

catalyst/data/bundles/core.py

@@ -1,5 +1,6 @@
 from collections import namedtuple
 import errno
+from io import BytesIO
 import os
 import requests
 import shutil

catalyst/data/bundles/poloniex.py

@@ -1,14 +1,5 @@
-import os
-from datetime import datetime
-
-import numpy as np
-import pandas as pd
-from pandas_datareader.data import DataReader
-from pandas.tseries.offsets import DateOffset
-import requests
-
-from catalyst.utils.calendars import register_calendar_alias
-from catalyst.utils.cli import maybe_show_progress
+from io import BytesIO
+import tarfile
 
 from . import core as bundles
 

catalyst/data/bundles/quandl.py

@@ -1,7 +1,6 @@
 """
 Module for building a complete daily dataset from Quandl's WIKI dataset.
 """
-from io import BytesIO
 from itertools import count
 import tarfile
 from time import time, sleep