diff --git a/awscli/customizations/cloudtrail/validation.py b/awscli/customizations/cloudtrail/validation.py
index 6df84ab9e87a..b7d2cc828b20 100644
--- a/awscli/customizations/cloudtrail/validation.py
+++ b/awscli/customizations/cloudtrail/validation.py
@@ -823,10 +823,9 @@ def _write_summary_text(self):
     def _write_ratio(self, valid, invalid, name):
         total = valid + invalid
         if total > 0:
-            sys.stdout.write('\n%d/%d %s files valid' % (valid, total, name))
+            sys.stdout.write(f'\n{valid:d}/{total:d} {name} files valid')
             if invalid > 0:
-                sys.stdout.write(', %d/%d %s files INVALID' % (invalid, total,
-                                                               name))
+                sys.stdout.write(f', {invalid:d}/{total:d} {name} files INVALID')
 
     def _on_missing_digest(self, bucket, last_key, **kwargs):
         self._invalid_digests += 1
diff --git a/awscli/customizations/configure/addmodel.py b/awscli/customizations/configure/addmodel.py
index 566ae9dfcc2d..d38574a47ece 100644
--- a/awscli/customizations/configure/addmodel.py
+++ b/awscli/customizations/configure/addmodel.py
@@ -77,8 +77,8 @@ def get_model_location(session, service_definition, service_name=None):
     data_path = session.get_component('data_loader').CUSTOMER_DATA_PATH
     # Use the version of the model to determine the file's naming convention.
     service_model_name = (
-        'service-%d.json' % int(
-            float(service_definition.get('version', '2.0'))))
+        f"service-{int(float(service_definition.get('version', '2.0'))):d}.json"
+    )
     return os.path.join(data_path, service_name, api_version,
         service_model_name)
 
diff --git a/awscli/customizations/configure/list.py b/awscli/customizations/configure/list.py
index a1c073b5a961..25f4669278e6 100644
--- a/awscli/customizations/configure/list.py
+++ b/awscli/customizations/configure/list.py
@@ -77,9 +77,9 @@ def _run_main(self, args, parsed_globals):
         return 0
 
     def _display_config_value(self, config_value, config_name):
-        self._stream.write('%10s %24s %16s    %s\n' % (
-            config_name, config_value.value, config_value.config_type,
-            config_value.config_variable))
+        self._stream.write(
+            f'{config_name:10s} {config_value.value:24s} {config_value.config_type:16s}    {config_value.config_variable}\n'
+        )
 
     def _lookup_credentials(self):
         # First try it with _lookup_config.  It's possible