diff --git a/openmc/data/neutron.py b/openmc/data/neutron.py
index 8023ff5902..9482c5bb04 100644
--- a/openmc/data/neutron.py
+++ b/openmc/data/neutron.py
@@ -1,6 +1,6 @@
-from __future__ import division, unicode_literals
 import sys
-from collections import OrderedDict, Iterable, Mapping, MutableMapping
+from collections import OrderedDict
+from collections.abc import Iterable, Mapping, MutableMappingimport sys
 from io import StringIO
 from itertools import chain
 from math import log10
@@ -10,7 +10,6 @@ import shutil
 import tempfile
 from warnings import warn
 
-from six import string_types
 import numpy as np
 import h5py
 
@@ -108,6 +107,7 @@ class IncidentNeutron(EqualityMixin):
     :meth:`IncidentNeutron.from_ace`.
 
     Parameters
+    ----------
     name : str
         Name of the nuclide using the GND naming convention
     atomic_number : int
@@ -887,10 +887,3 @@ class IncidentNeutron(EqualityMixin):
                 data[2].xs['0K'] = xs
 
         return data
-import sys
-from collections import OrderedDict
-from collections.abc import Iterable, Mapping, MutableMapping
-from io import StringIO
-from itertools import chain
-from math import log10
-from numbers import Integral, Real