diff --git a/common/djangoapps/util/file.py b/common/djangoapps/util/file.py
index 1a41fe8910..53e6b7cae0 100644
--- a/common/djangoapps/util/file.py
+++ b/common/djangoapps/util/file.py
@@ -146,7 +146,9 @@ class UniversalNewlineIterator(object):
         """
         Replace CR and CRLF with LF within `string`.
         """
-        return string.replace('\r\n', '\n').replace('\r', '\n')
+        if six.PY2:
+            return string.replace('\r\n', '\n').replace('\r', '\n')
+        return string.replace('\r\n', '\n').replace('\r', '\n').encode('utf-8')
 
     def generate_lines(self):
         """
diff --git a/common/lib/capa/capa/capa_problem.py b/common/lib/capa/capa/capa_problem.py
index fb572e00fd..5471bc4ea2 100644
--- a/common/lib/capa/capa/capa_problem.py
+++ b/common/lib/capa/capa/capa_problem.py
@@ -728,7 +728,10 @@ class LoncapaProblem(object):
         Main method called externally to get the HTML to be rendered for this capa Problem.
         """
         self.do_targeted_feedback(self.tree)
-        html = contextualize_text(etree.tostring(self._extract_html(self.tree)), self.context)
+        html = contextualize_text(
+            etree.tostring(self._extract_html(self.tree)).decode('utf-8'),
+            self.context
+        )
         return html
 
     def handle_input_ajax(self, data):
diff --git a/common/lib/capa/capa/xqueue_interface.py b/common/lib/capa/capa/xqueue_interface.py
index b70b6b9548..da7972c4f1 100644
--- a/common/lib/capa/capa/xqueue_interface.py
+++ b/common/lib/capa/capa/xqueue_interface.py
@@ -26,7 +26,7 @@ def make_hashkey(seed):
     Generate a string key by hashing
     """
     h = hashlib.md5()
-    h.update(str(seed))
+    h.update(six.b(str(seed)))
     return h.hexdigest()
 
 
diff --git a/common/lib/xmodule/xmodule/modulestore/tests/factories.py b/common/lib/xmodule/xmodule/modulestore/tests/factories.py
index 6995f6b858..2a685a8f74 100644
--- a/common/lib/xmodule/xmodule/modulestore/tests/factories.py
+++ b/common/lib/xmodule/xmodule/modulestore/tests/factories.py
@@ -472,7 +472,7 @@ class StackTraceCounter(object):
         """
         # pylint: disable=broad-except
 
-        stack = traceback.extract_stack()[:-2]
+        stack = [tuple(item) for item in traceback.extract_stack()[:-2]]
 
         if self._top_of_stack in stack:
             stack = stack[stack.index(self._top_of_stack):]
@@ -484,7 +484,6 @@ class StackTraceCounter(object):
                     safe_args.append(repr(arg))
                 except Exception as exc:
                     safe_args.append('<un-repr-able value: {}'.format(exc))
-
             safe_kwargs = {}
             for key, kwarg in kwargs.items():
                 try:
diff --git a/lms/djangoapps/instructor/views/api.py b/lms/djangoapps/instructor/views/api.py
index c2f8827928..5bb1cc91ba 100644
--- a/lms/djangoapps/instructor/views/api.py
+++ b/lms/djangoapps/instructor/views/api.py
@@ -519,7 +519,6 @@ def generate_random_string(length):
         char for char in string.ascii_uppercase + string.digits + string.ascii_lowercase
         if char not in 'aAeEiIoOuU1l'
     ]
-
     return ''.join((random.choice(chars) for i in range(length)))
 
 
diff --git a/lms/djangoapps/instructor_task/models.py b/lms/djangoapps/instructor_task/models.py
index 3c055cdc9d..0bcfa4a289 100644
--- a/lms/djangoapps/instructor_task/models.py
+++ b/lms/djangoapps/instructor_task/models.py
@@ -235,7 +235,10 @@ class ReportStore(object):
         compatibility.
         """
         for row in rows:
-            yield [six.text_type(item).encode('utf-8') for item in row]
+            if six.PY2:
+                yield [six.text_type(item).encode('utf-8') for item in row]
+            else:
+                yield [six.text_type(item) for item in row]
 
 
 class DjangoStorageReportStore(ReportStore):
@@ -283,7 +286,8 @@ class DjangoStorageReportStore(ReportStore):
         """
         output_buffer = ContentFile('')
         # Adding unicode signature (BOM) for MS Excel 2013 compatibility
-        output_buffer.write(codecs.BOM_UTF8)
+        if six.PY2:
+            output_buffer.write(codecs.BOM_UTF8)
         csvwriter = csv.writer(output_buffer)
         csvwriter.writerows(self._get_utf8_encoded_rows(rows))
         output_buffer.seek(0)
diff --git a/lms/djangoapps/instructor_task/tests/test_base.py b/lms/djangoapps/instructor_task/tests/test_base.py
index 0e8a784f34..24fd6915e3 100644
--- a/lms/djangoapps/instructor_task/tests/test_base.py
+++ b/lms/djangoapps/instructor_task/tests/test_base.py
@@ -383,9 +383,9 @@ class TestReportMixin(object):
         to four decimal places.
         """
         extracted = {}
-        for key, value in dictionary.items():
+        for key in list(dictionary):
             try:
-                float(value)
+                float(dictionary[key])
                 extracted[key] = round(float(dictionary.pop(key)), 4)
             except ValueError:
                 pass
diff --git a/lms/djangoapps/instructor_task/tests/test_tasks_helper.py b/lms/djangoapps/instructor_task/tests/test_tasks_helper.py
index 91fa03b734..2eab66f088 100644
--- a/lms/djangoapps/instructor_task/tests/test_tasks_helper.py
+++ b/lms/djangoapps/instructor_task/tests/test_tasks_helper.py
@@ -1463,7 +1463,7 @@ class TestCourseSurveyReport(TestReportMixin, InstructorTaskCourseTestCase):
         with report_store.storage.open(report_path) as csv_file:
             csv_file_data = csv_file.read()
             # Removing unicode signature (BOM) from the beginning
-            csv_file_data = csv_file_data.decode("utf-8-sig").encode("utf-8")
+            csv_file_data = csv_file_data.decode("utf-8-sig")
             for data in expected_data:
                 self.assertIn(data, csv_file_data)