def json_to_python_from_file():
    f=open('book.json','r',encoding='utf-8')
    s=f.read()
    print(s)
    rest = json.loads(s)
    print(rest['store'])
    f.close()

rest = json.loads(s)
print(rest['store'])
这个地方出错了，删掉这两句代码可以正常运行。

错误信息：
Traceback (most recent call last):
File “/Users/gaojian/PycharmProjects/图书比价工具/use_json.py”, line 48, in
json_to_python_from_file()
File “/Users/gaojian/PycharmProjects/图书比价工具/use_json.py”, line 39, in json_to_python_from_file
rest = json.loads(s)
File “/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/init.py”, line 346, in loads
return _default_decoder.decode(s)
File “/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/decoder.py”, line 340, in decode
raise JSONDecodeError(“Extra data”, s, end)
json.decoder.JSONDecodeError: Extra data: line 15 column 9 (char 336)