diff --git a/lms/djangoapps/program_enrollments/management/commands/expire_waiting_enrollments.py b/lms/djangoapps/program_enrollments/management/commands/expire_waiting_enrollments.py
index 40b175810b..fbfd8dfa7e 100644
--- a/lms/djangoapps/program_enrollments/management/commands/expire_waiting_enrollments.py
+++ b/lms/djangoapps/program_enrollments/management/commands/expire_waiting_enrollments.py
@@ -1,6 +1,10 @@
 """ Management command to cleanup old waiting enrollments """
+from __future__ import absolute_import
+
 import logging
+
 from django.core.management.base import BaseCommand
+
 from ... import tasks
 
 logger = logging.getLogger(__name__)
diff --git a/lms/djangoapps/program_enrollments/models.py b/lms/djangoapps/program_enrollments/models.py
index 6886629112..ee437bc81f 100644
--- a/lms/djangoapps/program_enrollments/models.py
+++ b/lms/djangoapps/program_enrollments/models.py
@@ -2,20 +2,21 @@
 """
 Django model specifications for the Program Enrollments API
 """
-from __future__ import unicode_literals
+from __future__ import absolute_import, unicode_literals
+
 import logging
 
 from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
-from course_modes.models import CourseMode
-from lms.djangoapps.program_enrollments.api.v1.constants import (
-    CourseEnrollmentResponseStatuses as ProgramCourseEnrollmentResponseStatuses
-)
 from model_utils.models import TimeStampedModel
 from opaque_keys.edx.django.models import CourseKeyField
 from simple_history.models import HistoricalRecords
+
+from course_modes.models import CourseMode
+from lms.djangoapps.program_enrollments.api.v1.constants import \
+    CourseEnrollmentResponseStatuses as ProgramCourseEnrollmentResponseStatuses
 from student.models import AlreadyEnrolledError, CourseEnrollment
 
 logger = logging.getLogger(__name__)  # pylint: disable=invalid-name
@@ -75,7 +76,7 @@ class ProgramEnrollment(TimeStampedModel):  # pylint: disable=model-missing-unic
         """
         return cls.objects.filter(
             program_uuid=program_uuid,
-            external_user_key__in=student_data.keys(),
+            external_user_key__in=list(student_data.keys()),
         )
 
     @classmethod
diff --git a/lms/djangoapps/program_enrollments/tasks.py b/lms/djangoapps/program_enrollments/tasks.py
index 7344bf4834..7ab6a00ab3 100644
--- a/lms/djangoapps/program_enrollments/tasks.py
+++ b/lms/djangoapps/program_enrollments/tasks.py
@@ -1,11 +1,14 @@
 """ Tasks for program enrollments """
-from datetime import timedelta
+from __future__ import absolute_import
+
 import logging
+from datetime import timedelta
+
 from celery import task
 from celery_utils.logged_task import LoggedTask
 from django.utils import timezone
 
-from lms.djangoapps.program_enrollments.models import ProgramEnrollment, ProgramCourseEnrollment
+from lms.djangoapps.program_enrollments.models import ProgramCourseEnrollment, ProgramEnrollment
 
 log = logging.getLogger(__name__)
 
diff --git a/lms/djangoapps/program_enrollments/utils.py b/lms/djangoapps/program_enrollments/utils.py
index d793e1431f..9035fb3e03 100644
--- a/lms/djangoapps/program_enrollments/utils.py
+++ b/lms/djangoapps/program_enrollments/utils.py
@@ -1,10 +1,14 @@
 """
 utility functions for program enrollments
 """
+from __future__ import absolute_import
+
 import logging
-from openedx.core.djangoapps.catalog.utils import get_programs
+
 from organizations.models import Organization
 from social_django.models import UserSocialAuth
+
+from openedx.core.djangoapps.catalog.utils import get_programs
 from third_party_auth.models import SAMLProviderConfig
 
 log = logging.getLogger(__name__)