diff --git a/payments/authorizenet/__init__.py b/payments/authorizenet/__init__.py
index 3c04ca40c..f0cbbc993 100644
--- a/payments/authorizenet/__init__.py
+++ b/payments/authorizenet/__init__.py
@@ -27,7 +27,7 @@ def __init__(
         login_id,
         transaction_key,
         endpoint="https://test.authorize.net/gateway/transact.dll",
-        **kwargs
+        **kwargs,
     ):
         self.login_id = login_id
         self.transaction_key = transaction_key
@@ -45,9 +45,7 @@ def get_transactions_data(self, payment):
             "x_description": payment.description,
             "x_first_name": payment.billing_first_name,
             "x_last_name": payment.billing_last_name,
-            "x_address": "{}, {}".format(
-                payment.billing_address_1, payment.billing_address_2
-            ),
+            "x_address": f"{payment.billing_address_1}, {payment.billing_address_2}",
             "x_city": payment.billing_city,
             "x_zip": payment.billing_postcode,
             "x_country": payment.billing_country_area,
diff --git a/payments/stripe/test_stripe.py b/payments/stripe/test_stripe.py
index 69fff7778..31f79c3db 100644
--- a/payments/stripe/test_stripe.py
+++ b/payments/stripe/test_stripe.py
@@ -91,11 +91,8 @@ def test_form_contains_stripe_script(self):
         self.assertTrue(
             '<script class="stripe-button" data-amount="10000" '
             'data-currency="USD" data-description="payment" data-email="john@doe.com" '
-            'data-image="" data-key="{}" data-name="{}" '
-            'src="https://checkout.stripe.com/checkout.js"></script>'.format(
-                PUBLIC_KEY, store_name
-            )
-            in str(form)
+            f'data-image="" data-key="{PUBLIC_KEY}" data-name="{store_name}" '
+            'src="https://checkout.stripe.com/checkout.js"></script>' in str(form)
         )
 
     def test_form_contains_stripe_script_without_billing_email(self):
@@ -115,11 +112,8 @@ def test_form_contains_stripe_script_without_billing_email(self):
         self.assertTrue(
             '<script class="stripe-button" data-amount="10000" '
             'data-currency="USD" data-description="payment" '
-            'data-image="" data-key="{}" data-name="{}" '
-            'src="https://checkout.stripe.com/checkout.js"></script>'.format(
-                PUBLIC_KEY, store_name
-            )
-            in str(form)
+            f'data-image="" data-key="{PUBLIC_KEY}" data-name="{store_name}" '
+            'src="https://checkout.stripe.com/checkout.js"></script>' in str(form)
         )
 
     def test_provider_raises_redirect_needed_when_token_does_not_exist(self):