如何从json查询中获取和打印特定数据?

时间:2019-02-05 12:05:29

标签: python json json-query

因此,我希望能够基于特定条件提取数据,然后希望能够从该查询中打印多个项目...这是我到目前为止所做的事情:

def rec():
    qe = JsonQ(r"C:\ShopFloor\data.json")
    res = qe.at('data').where('Status', '=', 1).get()
    for Process, Shortnum in res:
        print(Process['Process'] + " " + Shortnum['Shortnum'])

rec()

这来自以下json文件:

{
    "data": [
        {
            "Shortnum": "34567",
            "Process": "SPA",
            "Status": 1,
            "Start_Time": "2016-12-14 15:54:35",
            "Finish_Time": "2016-12-14 15:56:02"
        },
        {
            "Shortnum": "34567",
            "Process": "Figure",
            "Status": 0,
            "Start_Time": "2016-12-08 15:34:05",
            "Finish_Time": "2016-12-08 15:34:09"
        },

如何使它正常工作?理想情况下,我正在寻找印刷品中的这种响应:

SPA 34567

无法获得当前输出,我收到此错误...我意识到我传递了太多参数,但是我想不出合适的方法...

Exception has occurred: ValueError
too many values to unpack (expected 2)
  File "C:\ShopFloor\main.py", line 101, in rec
    for Process, Shortnum in res:
  File "C:\ShopFloor\main.py", line 106, in <module>
    rec()

1 个答案:

答案 0 :(得分:3)

在Python中使用JSON的典型方法是将JSON对象作为Python dict加载:

import json
with open('C:/ShopFloor/data.json', 'r') as f:
    qe = json.load(f)
for item in qe['data']:
    if item['Status'] == 1:
        print(f'{item["Process"]} {item["Shortnum"]}')

请注意,这使用Python 3's f-strings(在访问f字符串中的字典值时,请确保单引号和双引号交替出现)。在Python 2中,将最后一行替换为:

        print('{} {}'.format(item['Process'], item['Shortnum']))