Avoid types.NoneType

types.NoneType was removed in Python 3.

None is a singleton in Python, so 'x is None' is equivalent to
'isinstance(x, NoneType)'.

lib/ansible/playbook/helpers.py

@@ -20,8 +20,6 @@ __metaclass__ = type
 
 import os
 
-from types import NoneType
-
 from ansible.errors import AnsibleParserError
 from ansible.parsing.yaml.objects import AnsibleBaseYAMLObject, AnsibleSequence
 

lib/ansible/playbook/role/__init__.py

@@ -25,7 +25,6 @@ import inspect
 import os
 
 from hashlib import sha1
-from types import NoneType
 
 from ansible.errors import AnsibleError, AnsibleParserError
 from ansible.parsing import DataLoader
@@ -184,16 +183,16 @@ class Role(Base, Become, Conditional, Taggable):
 
         # vars and default vars are regular dictionaries
         self._role_vars  = self._load_role_yaml('vars')
-        if not isinstance(self._role_vars, (dict, NoneType)):
-            raise AnsibleParserError("The vars/main.yml file for role '%s' must contain a dictionary of variables" % self._role_name)
-        elif self._role_vars is None:
+        if self._role_vars is None:
             self._role_vars = dict()
+        elif not isinstance(self._role_vars, dict):
+            raise AnsibleParserError("The vars/main.yml file for role '%s' must contain a dictionary of variables" % self._role_name)
 
         self._default_vars = self._load_role_yaml('defaults')
-        if not isinstance(self._default_vars, (dict, NoneType)):
-            raise AnsibleParserError("The default/main.yml file for role '%s' must contain a dictionary of variables" % self._role_name)
-        elif self._default_vars is None:
+        if self._default_vars is None:
             self._default_vars = dict()
+        elif not isinstance(self._default_vars, dict):
+            raise AnsibleParserError("The default/main.yml file for role '%s' must contain a dictionary of variables" % self._role_name)
 
     def _load_role_yaml(self, subdir):
         file_path = os.path.join(self._role_path, subdir)