json.decoder.JSONDecodeError：期望用双引号括起来的属性名称：第 2 行第 1 列（字符 2）

Question

so I'm trying to build a library manager of sorts, as a way to practice my programming. It uses a JSON file to store book data. The problem occurs when I try to print the full list of books stored in the JSON file, in a nice format. Here is the code:

import json

book = {}

def add_book():
    book['name'] = input('Enter a book name: ')
    book['author'] = input('Enter the author: ')
    with open('storage.json', 'a') as storage:
        json.dump(book, storage)
        
def list_books():
    file = open('storage.json', 'r').readlines()
    for x in file:
        book.update(json.loads(x))
list_books()

It gives me this error:

"F:\LibraryManager\venv\Scripts\python.exe" "F:/LibraryManager/database.py"
Traceback (most recent call last):
  File "F:/LibraryManager/database.py", line 22, in <module>
    list_books()
  File "F:/LibraryManager/database.py", line 15, in list_books
    book.update(json.loads(x))
  File "F:\Python\lib\json\__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "F:\Python\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "F:\Python\lib\json\decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 2 column 1 (char 2)

Process finished with exit code 1

Here is the JSON file: (storage.json)

{ "name": "Lord of The Rings", "author": "J.R.R Tolkien" } { "name": "Harry Potter", "author": "JK Rowling" } { "name": "The Adventures of Huckleberry Finn", "author": "Mark Twain" }

What am I doing wrong?

Answer 1

Your JSON file is not correctly formatted. You have:

{"name": "Lord of The Rings", "author": "J.R.R Tolkien" } 
{"name": "Harry Potter", "author": "J.K Rowling" } 
{"name": "The Adventures of Huckleberry Finn", "author": "Mark Twain" }

You are missing commas between your lists. Try this instead:

{"name": "Lord of The Rings", "author": "J.R.R Tolkien"}, /* << comma here is mandatory! */
{"name": "Harry Potter", "author": "J.K Rowling"},
{"name": "The Adventures of Huckleberry Finn", "author": "Mark Twain"}

Since you're describing multiple objects, you must include spaces between them to tell your JSON parser that they are, in fact, separate objects.