Opaque-keys: fix pylint violations

common/djangoapps/student/management/commands/anonymized_id_mapping.py

@@ -13,7 +13,6 @@ import csv
 from django.contrib.auth.models import User
 from django.core.management.base import BaseCommand, CommandError
 
-from opaque_keys import InvalidKeyError
 from student.models import anonymous_id_for_user
 from xmodule.modulestore.locations import SlashSeparatedCourseKey
 

common/djangoapps/student/management/commands/create_random_users.py

@@ -1,16 +1,18 @@
-##
-## A script to create some dummy users
-
+"""
+A script to create some dummy users
+"""
 from django.core.management.base import BaseCommand
 from student.models import CourseEnrollment
-
+from opaque_keys import InvalidKeyError
+from xmodule.modulestore.keys import CourseKey
+from xmodule.modulestore.locations import SlashSeparatedCourseKey
 from student.views import _do_create_account, get_random_post_override
 
 
-def create(n, course_key):
-    """Create n users, enrolling them in course_key if it's not None"""
-    for i in range(n):
-        (user, user_profile, _) = _do_create_account(get_random_post_override())
+def create(num, course_key):
+    """Create num users, enrolling them in course_key if it's not None"""
+    for idx in range(num):
+        (user, user_profile, __) = _do_create_account(get_random_post_override())
         if course_key is not None:
             CourseEnrollment.enroll(user, course_key)
 
@@ -31,7 +33,7 @@ Examples:
             print Command.help
             return
 
-        n = int(args[0])
+        num = int(args[0])
 
         if len(args) == 2:
             try:
@@ -41,4 +43,4 @@ Examples:
         else:
             course_key = None
 
-        create(n, course_key)
+        create(num, course_key)

common/djangoapps/student/management/commands/get_grades.py

@@ -1,3 +1,7 @@
+"""
+Management command to generate a list of grades for
+all students that are enrolled in a course.
+"""
 from courseware import grades, courses
 from certificates.models import GeneratedCertificate
 from django.test.client import RequestFactory

common/djangoapps/student/roles.py

@@ -7,7 +7,6 @@ from abc import ABCMeta, abstractmethod
 
 from django.contrib.auth.models import User
 from student.models import CourseAccessRole
-from xmodule_django.models import CourseKeyField
 
 
 class AccessRole(object):