python学习笔记06：json操作

 1 import json
 2 # json模块作用：python的数据类型和json相互转换的
 3 d = {‘key1‘: ‘v1‘, ‘key2‘: ‘v2‘, ‘key3‘: ‘ v3‘, ‘name‘: ‘小明‘}
 4 
 5 # 字典转成字符串(json)
 6 json_str = json.dumps(d, indent=4, ensure_ascii=False)  #indent缩进字符，为了看着直观；ensure_ascii显示中文
 7 print(json_str)
 8 
 9 # 将字典转成json写入文件--dumps和dump
10 # dumps：先用dumps转成json，再写入文件
11 json_str = json.dumps(d, indent=4, ensure_ascii=False)
12 with open(‘u1.json‘, ‘w‘, encoding=‘utf-8‘) as f:
13     f.write(json_str)
14 
15 # dump：直接用dump转成json写入文件
16 with open(‘u1.json‘, ‘w‘, encoding=‘utf-8‘) as f:
17     json.dump(d, f, indent=4, ensure_ascii=False)

 1 import json
 2 
 3 json_str = """
 4 {
 5     "key1": "v1",
 6     "key2": "v2",
 7     "key3": " v3",
 8     "name": "小明"
 9 }
10 """
11 
12 # 字符串(json)转成字典
13 dic = json.loads(json_str) 
14 print(dic)
15 
16 # 读文件里的json再转成字典--loads和load
17 # loads：先读文件，再用loads传字符串，转字典
18 with open(‘u2.txt‘, encoding=‘utf-8‘) as f:
19     content = f.read()
20     print(json.loads(content))
21 
22 # load：直接用load传文件（自动做了一次读文件），转成字典
23 with open(‘u2.txt‘, encoding=‘utf-8‘) as f:
24     result = json.load(f)
25     print(result)

 1 # 若json格式不合法，报错
 2 json_str = """
 3 {
 4     ‘key1‘: "v1",
 5     "key2": "v2",
 6     "key3": " v3",
 7     "name": "小明"
 8 }
 9 """
10 dic = json.loads(json_str)
11 print(dic)
12 # 查看json格式是否正确，网站校验：bejson.com