python读取json文件报了个错（json.decoder.jsondecodeerror expecting property name enclosed in double quotes），问题在于一行行读json时，第一行为{时，并没有双引号，将按行读改为一次读入所有字符即可。比如：with open("3412.9_296.4.json", "r") as f: json_str = f.read()print(json_str)your_dict = json.loads(json_str)shapes = your_dict["shapes"]length = len(shapes)