diff --git a/awscli/customizations/eks/kubeconfig.py b/awscli/customizations/eks/kubeconfig.py
index 592cd0709cd1..2155d002c71f 100644
--- a/awscli/customizations/eks/kubeconfig.py
+++ b/awscli/customizations/eks/kubeconfig.py
@@ -125,8 +125,7 @@ def _validate_list_entry_types(self, config):
         :type config: Kubeconfig
         """
         for key, value in self._validation_content.items():
-            if (key in config.content and
-                    type(config.content[key]) == list):
+            if key in config.content and isinstance(config.content[key], list):
                 for element in config.content[key]:
                     if not isinstance(element, OrderedDict):
                         raise KubeconfigCorruptedError(
diff --git a/awscli/customizations/emr/configutils.py b/awscli/customizations/emr/configutils.py
index f3b3f96856aa..de05d0a9bce2 100644
--- a/awscli/customizations/emr/configutils.py
+++ b/awscli/customizations/emr/configutils.py
@@ -36,7 +36,7 @@ def get_current_profile_var_name(session):
 def _get_profile_str(session, separator):
     profile_name = session.get_config_variable('profile')
     return 'default' if profile_name is None \
-        else 'profile%c%s' % (separator, profile_name)
+        else f'profile{separator:c}{profile_name}'
 
 
 def is_any_role_configured(session):