代码

import json

# 将json数据对象写入文件
def json_file_write(json_filename):
    # json object
    jack = {'Name': 'JACK Williams',
            'ID': 391568,
            'At School': True}

    # write json object to file
    with open(json_filename, mode='w') as json_file:
        json.dump(jack, json_file)

# 从文件读入json数据对象
def json_file_read(json_filename):
    # load json object from file
    with open(json_filename) as json_file:
        json_object = json.load(json_file)

    # output the json object
    print(json_object)

# 程序入口
if __name__ == '__main__':
    # set a json file name
    filename_jack = 'jack.txt'

    # save json object as a file
    json_file_write(filename_jack)

    # load json object from a file
    json_file_read(filename_jack)

        效果（程序输出）

{'Name': 'JACK Williams', 'ID': 391568, 'At School': True}