diff --git a/setools/policyrep/boolcond.pxi b/setools/policyrep/boolcond.pxi
index 798c4ca..185d6f3 100644
--- a/setools/policyrep/boolcond.pxi
+++ b/setools/policyrep/boolcond.pxi
@@ -17,11 +17,8 @@
 # License along with SETools.  If not, see
 # <http://www.gnu.org/licenses/>.
 #
-from itertools import chain, product
-from collections import namedtuple
 
-
-truth_table_row = namedtuple("truth_table_row", ["values", "result"])
+truth_table_row = collections.namedtuple("truth_table_row", ["values", "result"])
 
 cdef dict _cond_cache = {}
 
@@ -243,7 +240,7 @@ cdef class Conditional(PolicySymbol):
         truth_table = []
 
         # create a list of all combinations of T/F for each Boolean
-        truth_list = list(product([True, False], repeat=len(bools)))
+        truth_list = list(itertools.product([True, False], repeat=len(bools)))
 
         for row in truth_list:
             values = {bools[i]: row[i] for i in range(len(bools))}
diff --git a/setools/policyrep/libpolicyrep.pyx b/setools/policyrep/libpolicyrep.pyx
index 91455f8..aa20ea8 100644
--- a/setools/policyrep/libpolicyrep.pyx
+++ b/setools/policyrep/libpolicyrep.pyx
@@ -26,6 +26,13 @@ from libc.stdlib cimport calloc, free
 from libc.string cimport memcpy, memset, strerror
 from posix.stat cimport S_IFBLK, S_IFCHR, S_IFDIR, S_IFIFO, S_IFREG, S_IFLNK, S_IFSOCK
 
+import logging
+import warnings
+import itertools
+import ipaddress
+import collections
+import enum
+
 cimport sepol
 cimport selinux
 
diff --git a/setools/policyrep/mls.pxi b/setools/policyrep/mls.pxi
index 07c026f..f8e897c 100644
--- a/setools/policyrep/mls.pxi
+++ b/setools/policyrep/mls.pxi
@@ -18,7 +18,6 @@
 # <http://www.gnu.org/licenses/>.
 #
 # pylint: disable=protected-access
-import itertools
 
 cdef dict _cat_cache = {}
 cdef dict _sens_cache = {}
diff --git a/setools/policyrep/mlsrule.pxi b/setools/policyrep/mlsrule.pxi
index b58c38a..eb2fcdc 100644
--- a/setools/policyrep/mlsrule.pxi
+++ b/setools/policyrep/mlsrule.pxi
@@ -17,7 +17,6 @@
 # License along with SETools.  If not, see
 # <http://www.gnu.org/licenses/>.
 #
-import itertools
 
 
 class MLSRuletype(PolicyEnum):
diff --git a/setools/policyrep/netcontext.pxi b/setools/policyrep/netcontext.pxi
index 0652db1..cbeabc2 100644
--- a/setools/policyrep/netcontext.pxi
+++ b/setools/policyrep/netcontext.pxi
@@ -17,13 +17,8 @@
 # License along with SETools.  If not, see
 # <http://www.gnu.org/licenses/>.
 #
-from collections import namedtuple
-from ipaddress import ip_address, ip_network
 
-import warnings
-import logging
-
-PortconRange = namedtuple("PortconRange", ["low", "high"])
+PortconRange = collections.namedtuple("PortconRange", ["low", "high"])
 
 #
 # Classes
@@ -138,12 +133,12 @@ cdef class Nodecon(Ocontext):
         try:
             # checkpolicy does not verify that no host bits are set,
             # so strict will raise an exception if host bits are set.
-            n.network = ip_network(net_with_mask)
+            n.network = ipaddress.ip_network(net_with_mask)
         except ValueError as ex:
             log = logging.getLogger(__name__)
             log.warning("Nodecon with network {} {} has host bits set. Analyses may have "
                         "unexpected results.".format(n._addr, n._mask))
-            n.network = ip_network(net_with_mask, strict=False)
+            n.network = ipaddress.ip_network(net_with_mask, strict=False)
 
         return n
 
diff --git a/setools/policyrep/selinuxpolicy.pxi b/setools/policyrep/selinuxpolicy.pxi
index cb1a317..117debd 100644
--- a/setools/policyrep/selinuxpolicy.pxi
+++ b/setools/policyrep/selinuxpolicy.pxi
@@ -19,9 +19,6 @@
 #
 # pylint: disable=too-many-public-methods
 
-import logging
-from collections import Counter
-
 
 class PolicyTarget(PolicyEnum):
 
@@ -223,7 +220,7 @@ cdef class SELinuxPolicy:
     cdef cache_constraint_counts(self):
         """Count all constraints in one iteration."""
         if not self.constraint_counts:
-            self.constraint_counts = Counter(r.ruletype for r in self.constraints())
+            self.constraint_counts = collections.Counter(r.ruletype for r in self.constraints())
 
     cdef cache_terule_counts(self):
         """Count all TE rules in one iteration."""
@@ -387,7 +384,7 @@ cdef class SELinuxPolicy:
     @property
     def permission_count(self):
         """The number of permissions."""
-        return sum(len(c.perms) for c in chain(self.commons(), self.classes()))
+        return sum(len(c.perms) for c in itertools.chain(self.commons(), self.classes()))
 
     @property
     def permissives_count(self):
@@ -549,7 +546,7 @@ cdef class SELinuxPolicy:
 
     def lookup_type_or_attr(self, name):
         """Look up a type or type attribute by name."""
-        for t in chain(self.types(), self.typeattributes()):
+        for t in itertools.chain(self.types(), self.typeattributes()):
             if t == name:
                 return t
 
@@ -640,8 +637,8 @@ cdef class SELinuxPolicy:
 
     def rbacrules(self):
         """Iterator over all RBAC rules."""
-        return chain(RoleAllowIterator.factory(self, self.handle.p.role_allow),
-                     RoleTransitionIterator.factory(self, self.handle.p.role_tr))
+        return itertools.chain(RoleAllowIterator.factory(self, self.handle.p.role_allow),
+                               RoleTransitionIterator.factory(self, self.handle.p.role_tr))
 
     def terules(self):
         """Iterator over all type enforcement rules."""
@@ -682,10 +679,12 @@ cdef class SELinuxPolicy:
 
     def nodecons(self):
         """Iterator over all nodecon statements."""
-        return chain(NodeconIterator.factory(self, self.handle.p.ocontexts[sepol.OCON_NODE],
-                                             NodeconIPVersion.ipv4),
-                     NodeconIterator.factory(self, self.handle.p.ocontexts[sepol.OCON_NODE6],
-                                             NodeconIPVersion.ipv6))
+        return itertools.chain(NodeconIterator.factory(self,
+                                                       self.handle.p.ocontexts[sepol.OCON_NODE],
+                                                       NodeconIPVersion.ipv4),
+                               NodeconIterator.factory(self,
+                                                       self.handle.p.ocontexts[sepol.OCON_NODE6],
+                                                       NodeconIPVersion.ipv6))
 
     def portcons(self):
         """Iterator over all portcon statements."""
diff --git a/setools/policyrep/terule.pxi b/setools/policyrep/terule.pxi
index 915b1b1..1e1ddeb 100644
--- a/setools/policyrep/terule.pxi
+++ b/setools/policyrep/terule.pxi
@@ -17,7 +17,6 @@
 # License along with SETools.  If not, see
 # <http://www.gnu.org/licenses/>.
 #
-import itertools
 
 
 #
@@ -557,7 +556,7 @@ cdef class TERuleIterator(PolicyIterator):
             sepol.avtab_ptr_t node
             uint32_t bucket = 0
 
-        count = Counter()
+        count = collections.Counter()
 
         while bucket < self.table[0].nslot:
             node = self.table[0].htable[bucket]
@@ -640,7 +639,7 @@ cdef class ConditionalTERuleIterator(PolicyIterator):
         """
         cdef sepol.cond_av_list_t *curr
 
-        count = Counter()
+        count = collections.Counter()
 
         curr = self.head
         while curr != NULL:
diff --git a/setools/policyrep/typeattr.pxi b/setools/policyrep/typeattr.pxi
index 4413ac9..18f89fd 100644
--- a/setools/policyrep/typeattr.pxi
+++ b/setools/policyrep/typeattr.pxi
@@ -17,7 +17,6 @@
 # License along with SETools.  If not, see
 # <http://www.gnu.org/licenses/>.
 #
-import warnings
 
 #
 # Cache objects
diff --git a/setools/policyrep/util.pxi b/setools/policyrep/util.pxi
index 39eb980..7b7482d 100644
--- a/setools/policyrep/util.pxi
+++ b/setools/policyrep/util.pxi
@@ -16,14 +16,11 @@
 # License along with SETools.  If not, see
 # <http://www.gnu.org/licenses/>.
 #
-import warnings
-
-from enum import Enum
 
 #
 # Classes
 #
-class PolicyEnum(Enum):
+class PolicyEnum(enum.Enum):
 
     """
     Base class for policy enumerations.
diff --git a/setools/policyrep/xencontext.pxi b/setools/policyrep/xencontext.pxi
index 26d8176..de96285 100644
--- a/setools/policyrep/xencontext.pxi
+++ b/setools/policyrep/xencontext.pxi
@@ -17,10 +17,9 @@
 # License along with SETools.  If not, see
 # <http://www.gnu.org/licenses/>.
 #
-from collections import namedtuple
 
-IomemconRange = namedtuple("IomemconRange", ["low", "high"])
-IoportconRange = namedtuple("IoportconRange", ["low", "high"])
+IomemconRange = collections.namedtuple("IomemconRange", ["low", "high"])
+IoportconRange = collections.namedtuple("IoportconRange", ["low", "high"])
 
 
 #