Use 'is None' and 'is not None'

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

@@ -13,7 +13,7 @@ def query_yes_no(question, default="yes"):
     """
     valid = {"yes":True,   "y":True,  "ye":True,
              "no":False,     "n":False}
-    if default == None:
+    if default is None:
         prompt = " [y/n] "
     elif default == "yes":
         prompt = " [Y/n] "

common/djangoapps/student/views.py

@@ -115,7 +115,7 @@ def get_date_for_press(publish_date):
 
 def press(request):
     json_articles = cache.get("student_press_json_articles")
-    if json_articles == None:
+    if json_articles is None:
         if hasattr(settings, 'RSS_URL'):
             content = urllib.urlopen(settings.PRESS_URL).read()
             json_articles = json.loads(content)
@@ -301,7 +301,7 @@ def change_enrollment(request):
     action = request.POST.get("enrollment_action", "")
 
     course_id = request.POST.get("course_id", None)
-    if course_id == None:
+    if course_id is None:
         return HttpResponse(json.dumps({'success': False,
                                         'error': 'There was an error receiving the course id.'}))
 
@@ -1203,7 +1203,7 @@ def _get_news(top=None):
     "Return the n top news items on settings.RSS_URL"
 
     feed_data = cache.get("students_index_rss_feed_data")
-    if feed_data == None:
+    if feed_data is None:
         if hasattr(settings, 'RSS_URL'):
             feed_data = urllib.urlopen(settings.RSS_URL).read()
         else:

common/lib/xmodule/xmodule/peer_grading_module.py

@@ -524,7 +524,7 @@ class PeerGradingModule(XModule):
         '''
         Show individual problem interface
         '''
-        if get == None or get.get('location') == None:
+        if get is None or get.get('location') is None:
             if not self.use_for_single_location:
                 #This is an error case, because it must be set to use a single location to be called without get parameters
                 #This is a dev_facing_error

lms/djangoapps/course_wiki/views.py

@@ -49,7 +49,7 @@ def course_wiki_redirect(request, course_id):
     if not course_slug:
         log.exception("This course is improperly configured. The slug cannot be empty.")
         valid_slug = False
-    if re.match('^[-\w\.]+$', course_slug) == None:
+    if re.match('^[-\w\.]+$', course_slug) is None:
         log.exception("This course is improperly configured. The slug can only contain letters, numbers, periods or hyphens.")
         valid_slug = False
 

lms/djangoapps/courseware/grades.py

@@ -140,7 +140,7 @@ def grade(student, request, course, student_module_cache=None, keep_raw_scores=F
     grading_context = course.grading_context
     raw_scores = []
 
-    if student_module_cache == None:
+    if student_module_cache is None:
         student_module_cache = StudentModuleCache(course.id, student, grading_context['all_descriptors'])
 
     totaled_scores = {}

lms/djangoapps/multicourse/multicourse_settings.py

@@ -68,7 +68,7 @@ def get_course_settings(coursename):
 
 
 def is_valid_course(coursename):
-    return get_course_settings(coursename) != None
+    return get_course_settings(coursename) is not None
 
 
 def get_course_property(coursename, property):

lms/djangoapps/simplewiki/views.py

@@ -236,7 +236,7 @@ def history(request, article_path, page=1, course_id=None):
 
     page_size = 10
 
-    if page == None:
+    if page is None:
         page = 1
     try:
         p = int(page)
@@ -310,7 +310,7 @@ def revision_feed(request, page=1, namespace=None, course_id=None):
 
     page_size = 10
 
-    if page == None:
+    if page is None:
         page = 1
     try:
         p = int(page)

lms/lib/comment_client/models.py

@@ -23,7 +23,7 @@ class Model(object):
         try:
             return self.attributes[name]
         except KeyError:
-            if self.retrieved or self.id == None:
+            if self.retrieved or self.id is None:
                 raise AttributeError("Field {0} does not exist".format(name))
             self.retrieve()
             return self.__getattr__(name)

lms/lib/symmath/formula.py

@@ -70,7 +70,7 @@ StrPrinter._print_hat = _print_hat
 
 
 def to_latex(x):
-    if x == None: return ''
+    if x is None: return ''
     # LatexPrinter._print_dot = _print_dot
     xs = latex(x)
     xs = xs.replace(r'\XI', 'XI')	 # workaround for strange greek
@@ -278,7 +278,7 @@ class formula(object):
 
         if self.the_sympy: return self.the_sympy
 
-        if xml == None:	 # root
+        if xml is None:	 # root
             if not self.is_mathml():
                 return my_sympify(self.expr)
             if self.is_presentation_mathml():

lms/templates/courseware/course_navigation.html

@@ -2,7 +2,7 @@
 <%page args="active_page=None" />
 
 <%
-if active_page == None and active_page_context is not UNDEFINED:
+if active_page is None and active_page_context is not UNDEFINED:
   # If active_page is not passed in as an argument, it may be in the context as active_page_context
   active_page = active_page_context
 

lms/templates/problem.html

@@ -1,7 +1,7 @@
 <%namespace name='static' file='static_content.html'/>
 <h2 class="problem-header">
   ${ problem['name'] }
-  % if problem['weight'] != 1 and problem['weight'] != None:
+  % if problem['weight'] != 1 and problem['weight'] is not None:
     : ${ problem['weight'] } points
   % endif
 </h2>
@@ -30,4 +30,4 @@
     </section>
     % endif
   </section>
-</section>
+</section>