add cls argument for save_json

khandy/utils_file_io.py

@@ -34,10 +34,10 @@ def load_json(filename, encoding='utf-8'):
     return data
 
 
-def save_json(filename, data, encoding='utf-8', sort_keys=False):
+def save_json(filename, data, encoding='utf-8', cls=None, sort_keys=False):
     if not filename.endswith('.json'):
         filename = filename + '.json'
     with open(filename, 'w', encoding=encoding) as f:
         json.dump(data, f, indent=4, separators=(',',': '),
-                  ensure_ascii=False, sort_keys=sort_keys)
+                  ensure_ascii=False, cls=cls, sort_keys=sort_keys)