Factory Cleanup

- Corrected import ordering
- Using a constant for the User password

ECOM-4896

common/djangoapps/student/tests/factories.py

 """Provides factories for student models."""
 import random
-
-from student.models import (User, UserProfile, Registration,
-                            CourseEnrollmentAllowed, CourseEnrollment,
-                            PendingEmailChange, UserStanding,
-                            CourseAccessRole)
-from course_modes.models import CourseMode
-from django.contrib.auth.models import Group, AnonymousUser
 from datetime import datetime
+from uuid import uuid4
+
 import factory
+from django.contrib.auth.models import Group, AnonymousUser
 from factory import lazy_attribute
 from factory.django import DjangoModelFactory
-from uuid import uuid4
-from pytz import UTC
 from opaque_keys.edx.locations import SlashSeparatedCourseKey
+from pytz import UTC
+
+from course_modes.models import CourseMode
+from student.models import (
+    User, UserProfile, Registration, CourseEnrollmentAllowed, CourseEnrollment, PendingEmailChange, UserStanding,
+    CourseAccessRole
+)
 
 # Factories are self documenting
 # pylint: disable=missing-docstring
 
+USER_PASSWORD = 'test'
+
 
 class GroupFactory(DjangoModelFactory):
     class Meta(object):
         model = Group
-        django_get_or_create = ('name', )
+        django_get_or_create = ('name',)
 
     name = factory.Sequence(u'group{0}'.format)
 
@@ -39,7 +42,7 @@ class UserStandingFactory(DjangoModelFactory):
 class UserProfileFactory(DjangoModelFactory):
     class Meta(object):
         model = UserProfile
-        django_get_or_create = ('user', )
+        django_get_or_create = ('user',)
 
     user = None
     name = factory.LazyAttribute(u'{0.user.first_name} {0.user.last_name}'.format)
@@ -83,7 +86,7 @@ class UserFactory(DjangoModelFactory):
 
     username = factory.Sequence(u'robot{0}'.format)
     email = factory.Sequence(u'robot+test+{0}@edx.org'.format)
-    password = factory.PostGenerationMethodCall('set_password', 'test')
+    password = factory.PostGenerationMethodCall('set_password', USER_PASSWORD)
     first_name = factory.Sequence(u'Robot{0}'.format)
     last_name = 'Test'
     is_staff = False
@@ -155,6 +158,7 @@ class PendingEmailChangeFactory(DjangoModelFactory):
     new_email: sequence of new+email+{}@edx.org
     activation_key: sequence of integers, padded to 30 characters
     """
+
     class Meta(object):
         model = PendingEmailChange