Allow passing objects to Bundle as args

stix2/__init__.py

@@ -124,9 +124,10 @@ class Bundle(_STIXBase):
         'objects': {},
     }
 
-    def __init__(self, **kwargs):
-        # TODO: Allow variable number of arguments to pass "objects" to the
-        # Bundle constructor
+    def __init__(self, *args, **kwargs):
+        # Add any positional arguments to the 'objects' kwarg.
+        if args:
+            kwargs['objects'] = kwargs.get('objects', []) + list(args)
 
         super(Bundle, self).__init__(**kwargs)
 

stix2/test/test_stix2.py

@@ -459,3 +459,9 @@ def test_create_bundle(indicator, malware, relationship):
     bundle = stix2.Bundle(objects=[indicator, malware, relationship])
 
     assert str(bundle) == EXPECTED_BUNDLE
+
+
+def test_create_bundle_with_positional_args(indicator, malware, relationship):
+    bundle = stix2.Bundle(indicator, malware, relationship)
+
+    assert str(bundle) == EXPECTED_BUNDLE