Some pep8/pylint cleanup

lms/djangoapps/shoppingcart/exceptions.py

 class PaymentException(Exception):
     pass
 
+
 class PurchasedCallbackException(PaymentException):
     pass
 
+
 class InvalidCartItem(PaymentException):
     pass

lms/djangoapps/shoppingcart/processors/__init__.py

@@ -7,6 +7,7 @@ module = __import__('shoppingcart.processors.' + processor_name,
                               'process_postpay_callback',
                               ])
 
+
 def render_purchase_form_html(*args, **kwargs):
     """
     The top level call to this module to begin the purchase.
@@ -16,6 +17,7 @@ def render_purchase_form_html(*args, **kwargs):
     """
     return module.render_purchase_form_html(*args, **kwargs)
 
+
 def process_postpay_callback(*args, **kwargs):
     """
     The top level call to this module after the purchase.
@@ -29,4 +31,3 @@ def process_postpay_callback(*args, **kwargs):
     return a helpful-enough error message in error_html.
     """
     return module.process_postpay_callback(*args, **kwargs)
-

lms/djangoapps/shoppingcart/processors/exceptions.py

 from shoppingcart.exceptions import PaymentException
 
+
 class CCProcessorException(PaymentException):
     pass
 
+
 class CCProcessorSignatureException(CCProcessorException):
     pass
 
+
 class CCProcessorDataException(CCProcessorException):
     pass
 
+
 class CCProcessorWrongAmountException(CCProcessorException):
     pass

lms/djangoapps/shoppingcart/processors/tests/test_CyberSource.py

@@ -13,15 +13,16 @@ from mock import patch, Mock
 
 
 TEST_CC_PROCESSOR = {
-    'CyberSource' : {
+    'CyberSource': {
         'SHARED_SECRET': 'secret',
-        'MERCHANT_ID' : 'edx_test',
-        'SERIAL_NUMBER' : '12345',
+        'MERCHANT_ID': 'edx_test',
+        'SERIAL_NUMBER': '12345',
         'ORDERPAGE_VERSION': '7',
         'PURCHASE_ENDPOINT': '',
     }
 }
 
+
 @override_settings(CC_PROCESSOR=TEST_CC_PROCESSOR)
 class CyberSourceTests(TestCase):
 
@@ -36,8 +37,8 @@ class CyberSourceTests(TestCase):
         """
         Tests the hash function.  Basically just hardcodes the answer.
         """
-        self.assertEqual(hash('test'), 'GqNJWF7X7L07nEhqMAZ+OVyks1Y=')
-        self.assertEqual(hash('edx '), '/KowheysqM2PFYuxVKg0P8Flfk4=')
+        self.assertEqual(processor_hash('test'), 'GqNJWF7X7L07nEhqMAZ+OVyks1Y=')
+        self.assertEqual(processor_hash('edx '), '/KowheysqM2PFYuxVKg0P8Flfk4=')
 
     def test_sign_then_verify(self):
         """
@@ -76,7 +77,7 @@ class CyberSourceTests(TestCase):
         """
         DECISION = 'REJECT'
         for code, reason in REASONCODE_MAP.iteritems():
-            params={
+            params = {
                 'decision': DECISION,
                 'reasonCode': code,
             }
@@ -109,8 +110,8 @@ class CyberSourceTests(TestCase):
         student1.save()
         student2 = UserFactory()
         student2.save()
-        params_cc = {'card_accountNumber':'1234', 'card_cardType':'001', 'billTo_firstName':student1.first_name}
-        params_nocc =  {'card_accountNumber':'', 'card_cardType':'002', 'billTo_firstName':student2.first_name}
+        params_cc = {'card_accountNumber': '1234', 'card_cardType': '001', 'billTo_firstName': student1.first_name}
+        params_nocc = {'card_accountNumber': '', 'card_cardType': '002', 'billTo_firstName': student2.first_name}
         order1 = Order.get_cart_for_user(student1)
         order2 = Order.get_cart_for_user(student2)
         record_purchase(params_cc, order1)
@@ -173,7 +174,7 @@ class CyberSourceTests(TestCase):
 
         # tests for an order number that doesn't match up
         params_bad_ordernum = params.copy()
-        params_bad_ordernum['orderNumber'] = str(order1.id+10)
+        params_bad_ordernum['orderNumber'] = str(order1.id + 10)
         with self.assertRaises(CCProcessorDataException):
             payment_accepted(params_bad_ordernum)
 
@@ -215,7 +216,7 @@ class CyberSourceTests(TestCase):
         self.assertDictContainsSubset({'amount': '1.00',
                                        'currency': 'usd',
                                        'orderPage_transactionType': 'sale',
-                                       'orderNumber':str(order1.id)},
+                                       'orderNumber': str(order1.id)},
                                       context['params'])
 
     def test_process_postpay_exception(self):

lms/djangoapps/shoppingcart/views.py

@@ -12,6 +12,7 @@ from .processors import process_postpay_callback, render_purchase_form_html
 
 log = logging.getLogger("shoppingcart")
 
+
 def test(request, course_id):
     item1 = PaidCourseRegistration(course_id, 200)
     item1.purchased_callback(request.user.id)
@@ -41,6 +42,7 @@ def register_for_verified_cert(request, course_id):
     CertificateItem.add_to_order(cart, course_id, 30, 'verified')
     return HttpResponse("Added")
 
+
 @login_required
 def show_cart(request):
     cart = Order.get_cart_for_user(request.user)
@@ -54,12 +56,14 @@ def show_cart(request):
                                'form_html': form_html,
                                })
 
+
 @login_required
 def clear_cart(request):
     cart = Order.get_cart_for_user(request.user)
     cart.clear()
     return HttpResponse('Cleared')
 
+
 @login_required
 def remove_item(request):
     item_id = request.REQUEST.get('id', '-1')
@@ -71,6 +75,7 @@ def remove_item(request):
         log.exception('Cannot remove cart OrderItem id={0}. DoesNotExist or item is already purchased'.format(item_id))
     return HttpResponse('OK')
 
+
 @csrf_exempt
 def postpay_callback(request):
     """
@@ -87,9 +92,10 @@ def postpay_callback(request):
     if result['success']:
         return HttpResponseRedirect(reverse('shoppingcart.views.show_receipt', args=[result['order'].id]))
     else:
-        return render_to_response('shoppingcart/error.html', {'order':result['order'],
+        return render_to_response('shoppingcart/error.html', {'order': result['order'],
                                                               'error_html': result['error_html']})
 
+
 @login_required
 def show_receipt(request, ordernum):
     """