Python json file read and write

1. Introduction to json

There are two data structures in json: dictionary {} and list []

{
    "name": "熊猫",
    "like": [
      "听歌",
      "看书",
      "运动"
    ],
    "address": {
      "country": "中国",
      "city": "上海"
    }
  }

Strings in json must use double quotes

Adding comments // or /**/ is not allowed in json files, so how can JSON add comments? You can use key: value to add a data element that acts as a comment in json

Second, python reads json files

json.load()：

import json  # 导入包

with open('Info.json', encoding='utf-8') as a:
    result = json.load(a)  # 导入json文件，a是文件对象，result是一个字典
    print(result.get('name'))  # 熊猫
    print(result.get('address').get('city'))  # 上海

Three, python writes json file

Dictionaries and sequences (lists or tuples) in python can be written to json files

json.dump()：

my_list = [('熊猫', '听歌', '上海'), ('老虎', '运动', '北京')]
with open('Info2.json', 'w', encoding='utf-8') as b:
    json.dump(my_list, b, ensure_ascii=False, indent=2)  # 不以ASCII的方式显示（显示中文），indent 缩进

Info2.json：

[
  [
    "熊猫",
    "听歌",
    "上海"
  ],
  [
    "老虎",
    "运动",
    "北京"
  ]
]

4. Convert python dictionary or sequence to json string

json.dumps()

import json
 
data = {"hi" : "你好", "who" : "全世界"}
json_str = json.dumps(data, indent=4, ensure_ascii=False)  # 缩进4，显示中文
print(json_str)

'''
输出：
{
    "hi": "你好",
    "who": "全世界"
} 
'''

reference:

How to add comments to json files? -js Tutorial-PHP Chinese Network

python——reading of json files - Extraordinary - Blog Garden (cnblogs.com)

Python3: json.dumps indentation display, processing Chinese, sorting output, specifying separator_python3 json.dumps_风静如云的博客-CSDN Blog