pylint/pep8 fixes

cms/djangoapps/contentstore/management/commands/check_course.py

 from django.core.management.base import BaseCommand, CommandError
 from xmodule.modulestore.django import modulestore
-from xmodule.contentstore.django import contentstore
 from xmodule.modulestore.xml_importer import check_module_metadata_editability
 from xmodule.course_module import CourseDescriptor
 
 from request_cache.middleware import RequestCache
 
-from django.core.cache import get_cache, InvalidCacheBackendError
 
 class Command(BaseCommand):
     help = '''Enumerates through the course and find common errors'''
 
     def handle(self, *args, **options):
-        if len(args) != 1 :
+        if len(args) != 1:
             raise CommandError("check_course requires one argument: <location>")
 
         loc_str = args[0]
 
         loc = CourseDescriptor.id_to_location(loc_str)
-     
         store = modulestore()
-        
+
         # setup a request cache so we don't throttle the DB with all the metadata inheritance requests
         store.request_cache = RequestCache.get_request_cache()
 
         course = store.get_item(loc, depth=3)
 
         err_cnt = 0
+
         def _xlint_metadata(module):
             err_cnt = check_module_metadata_editability(module)
             for child in module.get_children():
                 err_cnt = err_cnt + _xlint_metadata(child)
             return err_cnt
 
-        _xlint_metadata(course)
+        err_cnt = err_cnt + _xlint_metadata(course)
 
         # we've had a bug where the xml_attributes field can we rewritten as a string rather than a dict
         def _check_xml_attributes_field(module):
@@ -45,7 +43,7 @@ class Command(BaseCommand):
                 err_cnt = err_cnt + _check_xml_attributes_field(child)
             return err_cnt
 
-        _check_xml_attributes_field(course)
+        err_cnt = err_cnt + _check_xml_attributes_field(course)
 
         # check for dangling discussion items, this can cause errors in the forums
         def _get_discussion_items(module):
@@ -58,17 +56,13 @@ class Command(BaseCommand):
 
             return discussion_items
 
-        discussion_items =_get_discussion_items(course)
+        discussion_items = _get_discussion_items(course)
 
         # now query all discussion items via get_items() and compare with the tree-traversal
         queried_discussion_items = store.get_items(['i4x', course.location.org, course.location.course, 
-            'discussion', None, None])
+                                                    'discussion', None, None])
 
         for item in queried_discussion_items:
             if item.location.url() not in discussion_items:
                 print 'Found dangling discussion module = {0}'.format(item.location.url())
 
-
-
-
-