批量更改json文件中指定内容_js json中如何批量修改一个字段-优快云博客

本文介绍了一种使用Python批量修改指定文件夹内JSON文件中路径的方法。通过正则表达式匹配旧路径，并将其替换为新路径。适用于需要快速更新文件引用路径的场景。

要求：将所有json文件

[{"version": "1.0", "image": {"folder": "/export/guanghan/Data_2018/posetrack_data/images/val/000342_mpii_test", "name": "000000.jpg", "id": 0}, "candidates": [{"det_bbox": [228.1736297607422, 123.06813049316406, 481.76197814941406, 204.4611053466797], "det_score": 0.9851313233375549}, {"det_bbox": [592.2957153320312, 158.6912078857422, 196.05120849609375, 201......}]

将所有“folder”中“/export/guanghan/Data_2018/posetrack_data/images/val/”更改为“/data/Data_2018/posetrack_data/images/val/”

即将路径中的“/export/guanghan”更改为“/data”

import json
import os
import re

path = 'D:\\Desktop\\paper\\A-ls\\detections_openSVAI' #文件路径
dirs = os.listdir(path)

num_flag = 0
for file in dirs: # 循环读取路径下的文件并筛选输出
    if os.path.splitext(file)[1] == ".json": # 筛选Json文件
        num_flag = num_flag +1
        print("path ===== ",file)
        # print(os.path.join(path,file))
        with open(os.path.join(path,file),'r') as load_f:
            load_dict = json.load(load_f)
            print(load_f)
        n = len(load_dict)#获取字典load_dict中list值（因为每个list都有一个folder）

        for i in range (0,n):
            if re.findall('^/export/guanghan/',load_dict[i]['image']['folder']) : #模糊匹配，在folder中含有/export/guanghan/时
                load_dict[i]['image']['folder'] = '/data/Data_2018/posetrack_data/images/val/'+ os.path.splitext(file)[0]
                #路径更改，其中os.path.splitext(file)[0]是将文件名分为名字[0]+类型[1]

           # if load_dict['shapes'][i]['label'] == 'interstice':
             #   load_dict['shapes'][i]['label'] = 'cleft'
            with open(os.path.join(path,file),'w') as dump_f:
                json.dump(load_dict, dump_f)

if(num_flag == 0):
    print('所选文件夹不存在json文件，请重新确认要选择的文件夹')
else:
    print('共{}个json文件'.format(num_flag))