few flake8 and python3 problems corrected

cas_server/tests/utils.py

@@ -16,10 +16,6 @@ import django
 from django.test import Client
 from django.template import loader
 from django.utils import timezone
-if django.VERSION < (1, 8):
-    from django.template import Context
-else:
-    Context = lambda x:x
 
 import cgi
 import six
@@ -33,6 +29,13 @@ from cas_server import models
 from cas_server import utils
 
 
+if django.VERSION < (1, 8):
+    from django.template import Context
+else:
+    def Context(arg):
+        return arg
+
+
 def return_unicode(string, charset):
     """make `string` a unicode if `string` is a unicode or bytes encoded with `charset`"""
     if not isinstance(string, six.text_type):