diff --git a/graphene/types/dynamic.py b/graphene/types/dynamic.py
index 89951a3a..c02cfb0d 100644
--- a/graphene/types/dynamic.py
+++ b/graphene/types/dynamic.py
@@ -12,7 +12,7 @@ class Dynamic(MountedType):
 
     def __init__(self, type, with_schema=False, _creation_counter=None):
         super(Dynamic, self).__init__(_creation_counter=_creation_counter)
-        if not inspect.isfunction(type) or isinstance(type, partial):
+        if not (inspect.isfunction(type) or isinstance(type, partial)):
             raise AssertionError
         self.type = type
         self.with_schema = with_schema
diff --git a/graphene/types/union.py b/graphene/types/union.py
index 9e8f19e4..a501adc5 100644
--- a/graphene/types/union.py
+++ b/graphene/types/union.py
@@ -23,7 +23,7 @@ class Union(UnmountedType, BaseType):
 
     @classmethod
     def __init_subclass_with_meta__(cls, types=None, **options):
-        if not isinstance(types, (list, tuple)) and len(types) > 0:
+        if not (isinstance(types, (list, tuple)) and len(types) > 0):
             raise AssertionError("Must provide types for Union {name}.".format(name=cls.__name__))
         _meta = UnionOptions(cls)
         _meta.types = types