遇到:json.decoder.JSONDecodeError:预期值:第1行第1列(字符0) [英] Encounter: json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

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问题描述

当我尝试从创建的json文件中访问值时,出现了 json.decoder.JSONDecodeError:期望值:第1行第1列(字符0).我在下面运行了运行文件,但似乎存在解码器问题,但是,当创建json文件时,我将加密内容(应该添加到json文件的字典中)作为字符串进行了处理.有人可以帮我找出问题所在吗?

I got the json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) when I tried to access to the values from a json file I created. I ran the runfile below, and it seems that there was this decoder issue, however, when the json file was created, I made the encrypted content, which is supposed to be added to the json file's dictionary, as string. Could someone help me to spot where the problem is?

错误是:

{
    "youtube": {
        "key": "D5IPLv06NGXut4kKdScNAP47AieP8wqeUINr6EFLXFs=",
        "content": "gAAAAABclST8_XmHrAAfEbgrX-r6wwrJf7IAtDoLSkahXAraPjvoXeLl3HLkuHbW0uj5XpR4_jmkgk0ICmT8ZKP267-nnjnCpw=="
    },
    "facebook": {
        "key": "YexP5dpgxwKhD8Flr6hbJhMiAB1nmzZXi2IMMO3agXg=",
        "content": "gAAAAABclST8zSRen_0sur79NQk9Pin16PZcg95kEHnFt5vjKENMPckpnK9JQctayouQ8tHHeRNu--s58Jj3IPsPbrLoeOwr-mwdU5KvvaXLY-g6bUwnIp4="
    },
    "instagram": {
        "key": "ew2bl0tKdlgwiWfhB0jjSrOZDb41F88HULCQ_21EDGU=",
        "content": "gAAAAABclST8FKcZqasiXfARRfbGPqb3pdDj4aKuxeJoRvgIPbVIOZEa5s34f0c_H3_itv5iG1O7u8vvlT8lAPTgAp3ez8OBh4T2OfBG-ObljYmIt7exi0Q="
    }
}
Traceback (most recent call last):
  File "C:\Users\YOURNAME\Desktop\randomprojects\content_key_writer.py", line 65, in <module>
    main()
  File "C:\Users\YOURNAME\Desktop\randomprojects\content_key_writer.py", line 60, in main
    data_content = json.load(data_file)
  File "C:\Users\YOURNAME\AppData\Local\Programs\Python\Python37\lib\json\__init__.py", line 296, in load
    parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
  File "C:\Users\YOURNAME\AppData\Local\Programs\Python\Python37\lib\json\__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "C:\Users\YOURNAME\AppData\Local\Programs\Python\Python37\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Users\YOURNAME\AppData\Local\Programs\Python\Python37\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

原始代码粘贴在此处,将其命名为运行文件:

The original codes are pasted here, name this as the runfile:

import sys
import os
from cryptography.fernet import Fernet
import json
import pathlib
from encipher_decipher import encrypt, decrypt, bytes_to_str, str_to_bytes 

def content_key_writer(path, filename, account, content):
    """Generate key corresponding to an account, save in json"""
    # make the path a Path object
    path = pathlib.Path(path)
    file_path = os.path.join(path, filename)

    # generate a key using Fernet
    key = Fernet.generate_key()
    # json doesn't support bytes, so convert to string
    key = bytes_to_str(key)

    # with file_path, see if the file exists
    if not os.path.exists(file_path):
        # build the dictionary to hold key and content
        data = {}
        data[account] = {}
        data[account]['key'] = key
        data[account]['content'] = encrypt(content, key)


        # if the file doesn't exist, build the new json file
        with open(file_path, 'w') as f:
            json.dump(data, f)
    else:
        # if the file does exist
        with open(file_path, 'r') as f:
            data = json.load(f)
            data[account] = {} # <--- add the account 
            data[account]['key'] = key
            data[account]['content'] = encrypt(content, key)

        os.remove(file_path) # <--- remove the file and rewrite it
        with open(file_path, 'w') as f:
            json.dump(data, f, indent=4)

def main():
    path = "C:/Users/YOURNAME/Desktop/randomprojects"
    name = 'content.json'
    account = 'youtube'
    content = 'youtubepassword'
    account2 = 'facebook'
    content2 = 'facebookpassword'
    account3 = 'instagram'
    content3 = 'instagrampassword'

    content_key_writer(path, name, account, content)
    content_key_writer(path, name, account2, content2)
    content_key_writer(path, name, account3, content3)
    new_path = os.path.join(pathlib.Path(path),name)
    with open(new_path) as data_file:
        data = data_file.read()
        print(data) 
        data_content = json.load(data_file)
    value = data_content['youtube']['content']
    print(value)

if __name__ == '__main__':
    main()

在以上代码中导入的模块为encipher_decipher:

The module imported in the codes above is encipher_decipher:

"""
Given an information, encrypt and decrypt using the given key
"""

from cryptography.fernet import Fernet
import os

def encrypt(information, key):
    """encrypt information and return as string"""
    f = Fernet(key)
    information_bytes = str_to_bytes(information) 
    encrypted_info = f.encrypt(information_bytes) #<--- returns bytes
    encrypted_info = bytes_to_str(encrypted_info) #<--- to save in json requires str not bytes
    return encrypted_info

def decrypt(information, key):
    """decrypt information and return as string"""
    f = Fernet(key)
    information_bytes = str_to_bytes(information)
    decrypted_info = f.decrypt(information_bytes) #<--- returns bytes
    decrypted_info = bytes_to_str(decrypted_info) #<--- converts to string
    return decrypted_info

def bytes_to_str(byte_stuff):
    """Convert bytes to string"""
    return byte_stuff.decode('utf-8')

def str_to_bytes(str_stuff):
    """Converts string to bytes"""
    return bytes(str_stuff, 'utf-8') # or str_stuff.encode('utf-8')

推荐答案

问题是这段代码:

with open(new_path) as data_file:
  data = data_file.read()
  print(data) 
  data_content = json.load(data_file)

您正在将文件的内容读取到 data 中,进行打印,然后要求 json.load()再次从文件句柄中读取.但是,此时文件指针已经位于文件末尾,因此没有更多数据,因此出现json错误:期望值

You are reading the contents of the file into data, printing it, and then asking json.load() to read from the filehandle again. However at that point, the file pointer is already at the end of the file, so there's no more data, hence the json error: Expecting value

执行此操作:

with open(new_path) as data_file:
  data = data_file.read()
  print(data) 
  data_content = json.loads(data)

您已经将数据读入 data ,因此您只需将该字符串输入 json.loads()

You already have your data read into data, so you can just feed that string into json.loads()

这篇关于遇到:json.decoder.JSONDecodeError:预期值:第1行第1列(字符0)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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