def open_json_file(self, filename):
    with open(filename, 'r', encoding='utf-8') as f:
        metadata_file = json.load(f)
    return metadata_file
def open_json_file(self, filename):
    with open(filename, 'r', encoding='utf-8') as f:
        metadata_file = json.load(f)
    return metadata_file