Conversion of python and json data, reading and writing of json data, use of repr and eval (), and use of jsonrepr

Conversion of python and json data, reading and writing of json data, use of repr and eval (), and use of jsonrepr
Python data conversion json

Import json # import json package data = [{"id": 1, "username": "zhangshan", "password": "123qwe", "lock": True }, {"id": 2, "username": "lisi", "password": "123qwe", "lock": True}, {"id": 3, "username": "wangwu", "password": "123qwe", "lock": False}] jsonStr = json. dumps (data) # json data print (jsonStr) # python data print ('raw data string: ', repr (jsonStr ))

　　

Convert json to pathon data

pyStr = json.loads(jsonStr)print(pyStr)

Repr and eval usage

Repr (object) # convert an object to a string, similar to java's toString () eval (str) # convert repr () to an object

Json reading and writing

# Write JSON data with open ('data1. json ', 'w') as f: json. dump (data, f) # Read data with open ('data1. json ', 'R') as f: data = json. load (f)

Summary:

Data Conversion

Step 1: Introduce the json package: import json

Step 2: Use json. dumps (pythonObj) to convert python data to json data

Step 3: Use json. loads (jsonObj) to convert json data to python data

File write and read

Use dump to write data

Use load to read