01 遇到的错误
遇到错误的源代码如下:(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余票数:\033[32m%s\033[0m' %(dit['place'],dit['余票']))
def buy(i,lock): # 必须传入一个锁的对象
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购票成功\033[0m' %i)
dit['余票']-=1
else:
print('%s \033[31m无余票\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() # 实例化一个锁的对象
# 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}``
错误1
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa8 in position 18: illegal multibyte sequence
错误的原因:
gbk不能去解码bytes类型的数据,非法多字节序列
解决方法:
with open(path,mode='r',encoding='utf-8') as f:
现在感觉是在不完全弄明白decode,encode之前,不要随便的省略编码类型;
错误2
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
错误的原因:
期望双引号中包含的属性名称 (double quotes 双引号)
解决的方法:
一般情况是不会出现这样的情况的,因为通过json.dumps()向文件中写入str的类型,再通过json.loads()来将文件中str的类型转换成原格式,是不会存在问题的,
要注意的就是,json.dumps()写入的str字符串,字符串是用双引号的(" "),所有要是自己写一个文件通过json.loads()/json.dumps()操作,将字符串用双引号就好.