^源码：

 1 import os
 2 import json
 3 
 4 
 5 class SaveJson(object):
 6 
 7     def save_file(self, path, item):
 8         
 9         # 先将字典对象转化为可写入文本的字符串
10         item = json.dumps(item)
11 
12         try:
13             if not os.path.exists(path):
14                 with open(path, "w", encoding='utf-8') as f:
15                     f.write(item + ",
")
16                     print("^_^ write success")
17             else:
18                 with open(path, "a", encoding='utf-8') as f:
19                     f.write(item + ",
")
20                     print("^_^ write success")
21         except Exception as e:
22             print("write error==>", e)
23 
24 
25 if __name__ == '__main__':
26     # 保存的文件名
27     path = "test1.json"
28     # 案例字典数据
29     item = {"uid": "5bc05421vbjgj34hj9c7d83", "oss_status_code": 200,
30             "url": "http://www.51dev.com//FileUpload/news/202305/20230506212415342.jpg",
31             "updatedAt": "1970-01-18", "createdAt": "1970-01-18", "PID": "5b923c7vbcvbxcswrw342504b",
32             "_id": "5b98d052ed0cbe41","CID":"afdsfgasgfafghdgssdhh"}
33 
34     s = SaveJson()
35 
36     # 测试代码，循环写入三行，没有空行
37     for i in range(3):
38         s.save_file(path, item)

运行结果：

文件内容：