import json

information = [
    {'小区名称': '小区A', '均价': 8000, '月交易量': 20},
    {'小区名称': '小区B', '均价': 8500, '月交易量': 35},
    {'小区名称': '小区C', '均价': 7800, '月交易量': 50},
    {'小区名称': '小区D', '均价': 12000, '月交易量': 18}]

with open('房屋信息.json', 'w') as fp:
    json.dump(information, fp, indent=4, separators=[',', ':'])

with open('房屋信息.json') as fp:
    information = json.load(fp)
    for info in information:
        print(info)