Improved KeyError(s) message.

benedict/core/move.py

@@ -6,6 +6,6 @@ def move(d, key_src, key_dest, overwrite=True):
         return
     if key_dest in d and not overwrite:
         raise KeyError(
-            "'{}' already in target dict and `overwrite` is disabled.".format(key_dest)
-        )
+            'Invalid key: "{}", key already in target dict '
+            'and `overwrite` is disabled.'.format(key_dest))
     d[key_dest] = d.pop(key_src)

benedict/dicts/keylist/keylist_dict.py

@@ -36,7 +36,7 @@ class KeylistDict(dict):
         elif type_util.is_list(parent):
             del parent[key]
             return
-        raise KeyError(keys)
+        raise KeyError('Invalid keys: "{}"'.format(keys))
 
     def __getitem__(self, key):
         if type_util.is_list_or_tuple(key):
@@ -49,7 +49,7 @@ class KeylistDict(dict):
             return parent[key]
         elif type_util.is_list(parent):
             return parent[key]
-        raise KeyError(keys)
+        raise KeyError('Invalid keys: "{}"'.format(keys))
 
     def __setitem__(self, key, value):
         if type_util.is_list_or_tuple(key):
@@ -86,7 +86,7 @@ class KeylistDict(dict):
             return parent.pop(key)
         if args:
             return args[0]
-        raise KeyError
+        raise KeyError('Invalid keys: "{}"'.format(keys))
 
     def set(self, key, value):
         self[key] = value

benedict/dicts/keylist/keylist_util.py

@@ -16,7 +16,7 @@ def _get_item_key_and_value(item, key):
             return (index, item[index], )
     elif type_util.is_dict(item):
         return (key, item[key], )
-    raise KeyError(key)
+    raise KeyError('Invalid key: "{}"'.format(key))
 
 
 def _get_or_new_item_value(item, key, subkey):