small tweaks and pre-commit changes

stix2/base.py

@@ -22,7 +22,6 @@ from .utils import NOW, PREFIX_21_REGEX, get_timestamp
 from .versioning import new_version as _new_version
 from .versioning import revoke as _revoke
 
-
 DEFAULT_ERROR = "{type} must have {property}='{expected}'."
 SCO_DET_ID_NAMESPACE = uuid.UUID("00abedb4-aa42-466c-9c01-fed23315a9b7")
 
@@ -75,7 +74,7 @@ class _STIXBase(collections.abc.Mapping):
 
     def _check_at_least_one_property(self, list_of_properties=None):
         if not list_of_properties:
-            list_of_properties = sorted(list(self.__class__._properties.keys()))
+            list_of_properties = sorted(self.__class__._properties.keys())
             if isinstance(self, _Observable):
                 props_to_remove = {"type", "id", "defanged", "spec_version"}
             else:

stix2/properties.py

@@ -17,7 +17,6 @@ from .exceptions import (
 from .parsing import parse, parse_observable
 from .utils import _get_dict, get_class_hierarchy_names, parse_into_datetime
 
-
 TYPE_REGEX = re.compile(r'^-?[a-z0-9]+(-[a-z0-9]+)*-?$')
 TYPE_21_REGEX = re.compile(r'^([a-z][a-z0-9]*)+([a-z0-9-]+)*-?$')
 ERROR_INVALID_ID = (