json文件操作中遇到的問題

01 遇到的錯誤
遇到錯誤的源代碼如下:(修改后)

import time
from  multiprocessing import Process
import json
from multiprocessing import Lock

def show():
    with open(r'E:\text1\day36\ticket','r',encoding='utf-8') as f:
        dit=json.load(f)
    print('%s余票數(shù):\033[32m%s\033[0m' %(dit['place'],dit['余票']))

def buy(i,lock):                          # 必須傳入一個鎖的對象
    lock.acquire()
    time.sleep(0.5)
    with open(r'E:\text1\day36\ticket','r',encoding='utf-8') as f:
        dit = json.load(f)
    if dit['余票']>0:
        print('%s  \033[32m購票成功\033[0m' %i)
        dit['余票']-=1
    else:
        print('%s  \033[31m無余票\033[0m' %i)
    time.sleep(0.1)
    with open(r'E:\text1\day36\ticket','w',encoding='utf-8') as f:
        json.dump(dit,f)
    lock.release()

if __name__ =='__main__':

    for i in range(10):
        p=Process(target=show)
        p.start()
    lock=Lock()                          # 實(shí)例化一個鎖的對象
    # lock.acquire()
    # lock.release()
    for i in range(10):
        p=Process(target=buy,args=(i,lock))
        p.start()

ticket-text文件`
{"place": "\u54c8\u5c14\u6ee8-->\u5317\u4eac", "\u4f59\u7968": 0}``

錯誤1
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa8 in position 18: illegal multibyte sequence

錯誤的原因:
gbk不能去解碼bytes類型的數(shù)據(jù),非法多字節(jié)序列
解決方法:
with open(path,mode='r',encoding='utf-8') as f:
現(xiàn)在感覺是在不完全弄明白decode,encode之前,不要隨便的省略編碼類型;

錯誤2
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

錯誤的原因:
期望雙引號中包含的屬性名稱 (double quotes 雙引號)
解決的方法:
一般情況是不會出現(xiàn)這樣的情況的,因?yàn)橥ㄟ^json.dumps()向文件中寫入str的類型,再通過json.loads()來將文件中str的類型轉(zhuǎn)換成原格式,是不會存在問題的,
要注意的就是,json.dumps()寫入的str字符串,字符串是用雙引號的(" "),所有要是自己寫一個文件通過json.loads()/json.dumps()操作,將字符串用雙引號就好.