在Python中使用json文件时出错

如何解决在Python中使用json文件时出错

帮助解决json错误-

C:\Users\123\AppData\Local\Programs\Python\Python38>python C:\main_3.py
Traceback (most recent call last):
  File "C:\main_3.py",line 10,in <module>
    data = json.load(file)
  File "C:\Users\123\AppData\Local\Programs\Python\Python38\lib\json\__init__.py",line 293,in load
    return loads(fp.read(),File "C:\Users\123\AppData\Local\Programs\Python\Python38\lib\json\__init__.py",line 357,in loads
    return _default_decoder.decode(s)
  File "C:\Users\123\AppData\Local\Programs\Python\Python38\lib\json\decoder.py",line 337,in decode
    obj,end = self.raw_decode(s,idx=_w(s,0).end())
  File "C:\Users\123\AppData\Local\Programs\Python\Python38\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)

C:\Users\123\AppData\Local\Programs\Python\Python38>

也许此错误是由于文件为空-ping_data.json？在这种情况下，我不知道如何为首次启动准备该文件。

电报机器人。 该程序的目的是对主机执行ping操作并记录上次检查的状态，并且在程序崩溃和启动的情况下，必须从文件中读取上次检查的所有结果。

完整代码

import telebot
from pythonping import ping
import time
import yaml
from libs.host import address
import json

ping_data = dict()
with open('C:\ping_data.json') as file:
    data = json.load(file)

def init():

    global bot,userid,interval

    interval = 30

    with open('C:\config2.yaml',encoding="utf-8") as f:
        try:
            docs = yaml.load_all(f,Loader=yaml.FullLoader)

            for doc in docs:
                for k,v in doc.items():
                    if k == "botkey":
                        bot = telebot.TeleBot(v)
                    elif k == "userid":
                        userid = v
                    elif k == "hosts":
                        set_hosts(v)
                    elif k == "interval":
                        interval = int(v)

        except yaml.YAMLError as exc:
            print(exc)

def set_hosts(hosts):

    """
    Здесь парсим список хостов и передаем их в массив
    """

    global hosts_list
    hosts_list = []

    for item in hosts:
        ac = item.split(":")
        hosts_list.append(address(ac[0],ac[1]))

def send_message(message):

    """
    Посылаем сообщение пользователю
    """

    bot.send_message(userid,message)

def ping_host(address):

    status = ping_url(address.address)
    if data['address.address'] != status:
        ping_data['address.address'] = status
        send_message(( "! " if status is None else "+ " if status else "- ") + address.comment)

def ping_url(url):

    """
    Пинг хоста. Response list - это ответ библиотеки ping. По умолчанию она
    посылает четыре пакета. Если хотя бы один пинг успешен,хост активен
    """

    try:
        response_list = ping(url,timeout=5,verbose = True)
    except:
        return None

    return sum(1 for x in response_list if x.success) > 0

def main():

    """
    Бесконечный цикл,который пингует сервисы один за другим.
    """

    init()

    while True:

        for host in hosts_list:
            ping_host(host)
            with open('C:\ping_data.json','w') as file:
                json.dump(ping_data,file,indent=2)

        time.sleep(interval)

if __name__ == '__main__':
    main()

例如config2.yaml文件的内容。

botkey: ***********************************
userid: -**********
interval: 60
hosts:
  - "google.com:Google.ru"
  - "ya.ru:Yandex.ru"
  - "mail.ru:Mail.ru"
  - "rambler.ru:Rambler.ru"

解决方法

您不能将空文件读为词典。但是您可以从文件中读取空字典。

所以， 尝试将空字典保存在文件中，而不是在首次启动时保存文件 即：ping_data.json的内容应为空花括号（如以下内容所示）

{}

干杯。

,

了解，一切正常。该错误仅是由于JSON文件的编码引起的。