Remove default values from class-level list annotations

derek73 · claude · derek73 · commit 9ca29f3e5cf4 · 2026-06-08T01:47:00.000-07:00
Using = [] on class-level attributes creates a single shared list
instance across all HumanName instances. Any direct mutation (e.g.
hn.first_list.append(...)) on an instance created without a full_name
would corrupt the default for all subsequent instances. Both code paths
in __init__ (parse_full_name and the per-attribute setters) always
initialize these as instance-level lists, so the class-level defaults
were never needed — only the type annotations are.

Co-Authored-By: Claude Sonnet 4.6 &lt;noreply@anthropic.com&gt;
diff --git a/nameparser/parser.py b/nameparser/parser.py
@@ -82,12 +82,12 @@ class HumanName:
     unparsable = True
     _full_name = ''
 
-    title_list: list[str] = []
-    first_list: list[str] = []
-    middle_list: list[str] = []
-    last_list: list[str] = []
-    suffix_list: list[str] = []
-    nickname_list: list[str] = []
+    title_list: list[str]
+    first_list: list[str]
+    middle_list: list[str]
+    last_list: list[str]
+    suffix_list: list[str]
+    nickname_list: list[str]
 
     def __init__(
         self,
