TST: fix data tests

tests/data/bundles/test_core.py

@@ -303,7 +303,7 @@ class BundleCoreTestCase(WithInstanceTmpDir, ZiplineTestCase):
                   output_dir):
                 _wrote_to.append(output_dir)
 
-        _wrote_to.clear()
+        _wrote_to[:] = []
         self.ingest('bundle', environ=self.environ)
         assert_equal(len(_wrote_to), 1, msg='ingest was called more than once')
         ingestions = self._list_bundle()

tests/data/bundles/test_yahoo.py

@@ -1,3 +1,5 @@
+from __future__ import division
+
 import numpy as np
 import pandas as pd
 from six.moves.urllib.parse import urlparse, parse_qs
@@ -201,4 +203,5 @@ class YahooBundleTestCase(WithResponses, ZiplineTestCase):
                 adjustments,
                 expected,
                 msg=column,
+                decimal=4,
             )