fixed type hints for python 3.9

src/dccXMLJSONConv/dccConv.py

@@ -7,7 +7,8 @@ import re
 from functools import reduce
 import operator
 from importlib import resources as imp_resources
-from importlib.resources import files
+from importlib.resources import files  # Python 3.9+
+
 import warnings
 from typing import Union #for python 3.8/3.9 compatibility
 
@@ -28,7 +29,7 @@ def strip_outer_xml_tag(xml_str: str, outer_tag: str) -> str:
     return xml_str
 
 
-def get_from_dict(data_dict: dict, map_list: list[int|str]):
+def get_from_dict(data_dict: dict, map_list: list[Union[int,str]]):
     """get entry from dict at specified location
 
     Args:
@@ -41,7 +42,7 @@ def get_from_dict(data_dict: dict, map_list: list[int|str]):
     return reduce(operator.getitem, map_list, data_dict)
 
 
-def set_in_dict(data_dict: dict, map_list: list[int|str], value):
+def set_in_dict(data_dict: dict, map_list: list[Union[int,str]], value):
     """insert value into dict
 
     Args: