diff --git a/openstackclient/common/commandmanager.py b/openstackclient/common/commandmanager.py
index b809d63..c190e33 100644
--- a/openstackclient/common/commandmanager.py
+++ b/openstackclient/common/commandmanager.py
@@ -56,4 +56,4 @@ class CommandManager(cliff.commandmanager.CommandManager):
                 )
                 group_list.append(cmd_name)
             return group_list
-        return self.commands.keys()
+        return list(self.commands.keys())
diff --git a/openstackclient/common/exceptions.py b/openstackclient/common/exceptions.py
index 5f5f5ab..ee0f7a1 100644
--- a/openstackclient/common/exceptions.py
+++ b/openstackclient/common/exceptions.py
@@ -122,7 +122,7 @@ def from_response(response, body):
     cls = _code_map.get(response.status, ClientException)
     if body:
         if hasattr(body, 'keys'):
-            error = body[body.keys()[0]]
+            error = body[list(body.keys())[0]]
             message = error.get('message')
             details = error.get('details')
         else:
diff --git a/openstackclient/common/utils.py b/openstackclient/common/utils.py
index 840da40..c6ed6a7 100644
--- a/openstackclient/common/utils.py
+++ b/openstackclient/common/utils.py
@@ -281,7 +281,7 @@ def get_client_class(api_name, version, version_map):
         client_path = version_map[str(version)]
     except (KeyError, ValueError):
         msg = "Invalid %s client version '%s'. must be one of: %s" % (
-              (api_name, version, ', '.join(version_map.keys())))
+              (api_name, version, ', '.join(list(version_map.keys()))))
         raise exceptions.UnsupportedVersion(msg)
 
     return importutils.import_class(client_path)
diff --git a/openstackclient/shell.py b/openstackclient/shell.py
index 53e9be0..7750f2a 100644
--- a/openstackclient/shell.py
+++ b/openstackclient/shell.py
@@ -355,7 +355,7 @@ class OpenStackShell(app.App):
                         self.log.warning(
                             "%s version %s is not in supported versions %s"
                             % (api, version_opt,
-                               ', '.join(mod.API_VERSIONS.keys())))
+                               ', '.join(list(mod.API_VERSIONS.keys()))))
 
                 # Command groups deal only with major versions
                 version = '.v' + version_opt.replace('.', '_').split('_')[0]