Minor cleanup of strings

ECOM-6975

ecommerce/core/constants.py

 """Constants core to the ecommerce app."""
+from __future__ import unicode_literals
 
-ISO_8601_FORMAT = u'%Y-%m-%dT%H:%M:%SZ'
-
+ISO_8601_FORMAT = '%Y-%m-%dT%H:%M:%SZ'
 
 # Regex used to match course IDs.
 COURSE_ID_REGEX = r'[^/+]+(/|\+)[^/+]+(/|\+)[^/]+'
 COURSE_ID_PATTERN = r'(?P<course_id>{})'.format(COURSE_ID_REGEX)
 
-
 # Seat constants
-SEAT_PRODUCT_CLASS_NAME = "Seat"
-
+SEAT_PRODUCT_CLASS_NAME = 'Seat'
 
 # Enrollment Code constants
 ENROLLMENT_CODE_PRODUCT_CLASS_NAME = 'Enrollment Code'
@@ -23,11 +21,11 @@ DEFAULT_CATALOG_PAGE_SIZE = 100
 
 class Status(object):
     """Health statuses."""
-    OK = u"OK"
-    UNAVAILABLE = u"UNAVAILABLE"
+    OK = 'OK'
+    UNAVAILABLE = 'UNAVAILABLE'
 
 
 class UnavailabilityMessage(object):
     """Messages to be logged when services are unavailable."""
-    DATABASE = u"Unable to connect to database"
-    LMS = u"Unable to connect to LMS"
+    DATABASE = 'Unable to connect to database'
+    LMS = 'Unable to connect to LMS'

ecommerce/extensions/fulfillment/modules.py

@@ -15,7 +15,7 @@ from rest_framework import status
 import requests
 from requests.exceptions import ConnectionError, Timeout
 
-from ecommerce.core.constants import ENROLLMENT_CODE_PRODUCT_CLASS_NAME
+from ecommerce.core.constants import ENROLLMENT_CODE_PRODUCT_CLASS_NAME, SEAT_PRODUCT_CLASS_NAME
 from ecommerce.core.url_utils import get_lms_enrollment_api_url
 from ecommerce.courses.models import Course
 from ecommerce.courses.utils import mode_for_seat
@@ -125,7 +125,7 @@ class EnrollmentFulfillmentModule(BaseFulfillmentModule):
         return requests.post(enrollment_api_url, data=json.dumps(data), headers=headers, timeout=timeout)
 
     def supports_line(self, line):
-        return line.product.get_product_class().name == 'Seat'
+        return line.product.get_product_class().name == SEAT_PRODUCT_CLASS_NAME
 
     def get_supported_lines(self, lines):
         """ Return a list of lines that can be fulfilled through enrollment.