Minor changes.

.isort.cfg

@@ -1,7 +1,7 @@
 [settings]
 check=1
 diff=1
-known_third_party=dateutil,pytest,pytz,six,requests,taxii2client
+known_third_party=ordereddict,dateutil,pytest,pytz,requests,simplejson,six,stix2patterns,stix2validator,taxii2client
 known_first_party=stix2
 not_skip=__init__.py
 force_sort_within_sections=1

stix2/base.py

@@ -38,7 +38,7 @@ def get_required_properties(properties):
 class _STIXBase(collections.Mapping):
     """Base class for STIX object types"""
 
-    def _object_properties(self):
+    def object_properties(self):
         return list(self._properties.keys())
 
     def _check_property(self, prop_name, prop, kwargs):
@@ -146,7 +146,7 @@ class _STIXBase(collections.Mapping):
         super(_STIXBase, self).__setattr__(name, value)
 
     def __str__(self):
-        properties = self._object_properties()
+        properties = self.object_properties()
 
         def sort_by(element):
             return find_property_index(self, properties, element)
@@ -157,7 +157,7 @@ class _STIXBase(collections.Mapping):
                           separators=(",", ": "))
 
     def __repr__(self):
-        props = [(k, self[k]) for k in self._object_properties() if self.get(k)]
+        props = [(k, self[k]) for k in self.object_properties() if self.get(k)]
         return "{0}({1})".format(self.__class__.__name__,
                                  ", ".join(["{0!s}={1!r}".format(k, v) for k, v in props]))
 

stix2/exceptions.py

@@ -121,7 +121,7 @@ class DependentPropertiesError(STIXError, TypeError):
     def __str__(self):
         msg = "The property dependencies for {0}: ({1}) are not met."
         return msg.format(self.cls.__name__,
-                          ", ".join(x for x in self.dependencies))
+                          ", ".join(name for x in self.dependencies for name in x))
 
 
 class AtLeastOnePropertyError(STIXError, TypeError):

stix2/utils.py

@@ -133,7 +133,7 @@ def find_property_index(obj, properties, tuple_to_find):
                 for item in pv:
                     if isinstance(item, _STIXBase):
                         val = find_property_index(item,
-                                                  item._object_properties(),
+                                                  item.object_properties(),
                                                   tuple_to_find)
                         if val is not None:
                             return val
@@ -146,7 +146,7 @@ def find_property_index(obj, properties, tuple_to_find):
                 for item in pv.values():
                     if isinstance(item, _STIXBase):
                         val = find_property_index(item,
-                                                  item._object_properties(),
+                                                  item.object_properties(),
                                                   tuple_to_find)
                         if val is not None:
                             return val