4_1 ptyhon对象转json字符串

 1 """ptyhon对象转json字符串"""
 2 
 3 
 4 import json
 5 
 6 persons = [
 7     {'username': '张三', 'age': 18, 'country': 'china'},
 8     {'username': 'lisi', 'age': 20, 'country': 'USA'}
 9 ]
10 # 使用dumps函数据把列表转成json字符串
11 json_str = json.dumps(persons)
12 print(type(json_str))       # <class 'str'>
13 print(json_str)
14 # 再把json字符串写入文件
15 with open('4_1person.json', 'w') as fp:
16     fp.write(json_str)
17 
18 # 也可直接把列表写入文件中
19 with open('4_1person2.json', 'w') as fp:
20     json.dump(persons, fp)
21 # 对存在中文字符时不做处理会进行编码
22 with open('4_1person3.json', 'w', encoding="UTF-8") as fp:
23     json.dump(persons, fp, ensure_ascii=False)