Fixes Project-MONAI#7557

Change mapping_json_path init way.

Signed-off-by: staydelight <kevin295643815697236@gmail.com>

monai/transforms/io/array.py

@@ -394,7 +394,7 @@ def __init__(
         output_name_formatter: Callable[[dict, Transform], dict] | None = None,
         folder_layout: FolderLayoutBase | None = None,
         savepath_in_metadict: bool = False,
-        mapping_json_path: Union[Path, str, None] = None
+        mapping_json_path: Path | str | None = None
     ) -> None:
         self.folder_layout: FolderLayoutBase
         if folder_layout is None:
@@ -443,7 +443,7 @@ def __init__(
         if mapping_json_path:
             self.mapping_json_path = Path(mapping_json_path)
             self.savepath_in_metadict = True
-        else:
+        else: 
             self.mapping_json_path = None
 
     def set_options(self, init_kwargs=None, data_kwargs=None, meta_kwargs=None, write_kwargs=None):
@@ -519,9 +519,9 @@ def __call__(
                         "input": meta_data.get("filename_or_obj", ()),
                         "output": meta_data.get("saved_to", ())
                     })
-
+                    
                     try:
-                        with open(self.mapping_json_path) as f:
+                        with open(self.mapping_json_path, 'r') as f:
                             existing_log_data = json.load(f)
                     except FileNotFoundError:
                         existing_log_data = []

monai/transforms/io/dictionary.py

@@ -281,7 +281,7 @@ def __init__(
         output_name_formatter: Callable[[dict, Transform], dict] | None = None,
         folder_layout: monai.data.FolderLayoutBase | None = None,
         savepath_in_metadict: bool = False,
-        mapping_json_path: Union[Path, str, None] = None
+        mapping_json_path: Path | str | None = None
     ) -> None:
         super().__init__(keys, allow_missing_keys)
         self.meta_keys = ensure_tuple_rep(meta_keys, len(self.keys))