Handle views in util functions.

law/job/base.py

@@ -367,9 +367,7 @@ def encode_bool(cls, value):
     @classmethod
     def encode_list(cls, value):
         encoded = base64.b64encode(six.b(" ".join(str(v) for v in value) or "-"))
-        if six.PY3:
-            return encoded.decode("utf-8")
-        return encoded
+        return encoded.decode("utf-8") if six.PY3 else encoded
 
     def pack(self):
         return [

law/util.py

@@ -31,6 +31,7 @@
 
 
 class NoValue(object):
+
     def __bool__(self):
         return False
 
@@ -307,6 +308,10 @@ def times_two(i):
     objects of the respective types are traversed or mapped. The can be booleans or integer values
     that define the depth of that setting in the struct.
     """
+    # interpret generators and views as lists
+    if isinstance(struct, (types.GeneratorType, ValuesView)):
+        struct = list(struct)
+
     types = tuple()
     if map_dict:
         types = types + (dict,)
@@ -367,12 +372,12 @@ def times_two(i):
 
 
 def mask_struct(mask, struct, replace=_no_value):
-    # interpret genrators as lists
-    if isinstance(struct, types.GeneratorType):
-        return mask_struct(mask, list(struct), replace=replace)
+    # interpret generators and views as lists
+    if isinstance(struct, (types.GeneratorType, ValuesView)):
+        struct = list(struct)
 
     # when mask is a bool, or struct is not a dict or sequence, apply the mask immediately
-    elif isinstance(mask, bool) or not isinstance(struct, (list, tuple, dict)):
+    if isinstance(mask, bool) or not isinstance(struct, (list, tuple, dict)):
         return struct if mask else replace
 
     # check list and tuple types