python向json中追加数据的两种方法总结

json_content = []

with open(fjson, 'r') as f:
    content = json.load(f)
    # 读取所有字段
    version = content["version"]
    flags = content["flags"]
    shapes = content["shapes"]
    imageData = content["imageData"]
    imagePath = content["imagePath"]
    imageHeight = content["imageHeight"]
    imageWidth = content["imageWidth"]
 
    item_dict = {
        "version": version,
        "flags": flags,
        "shapes": shapes,
        "imageData": imageData,
        "imagePath": imagePath,
        "imageHeight": imageHeight,
        "imageWidth": imageWidth
    }
 
    json_content.append(item_dict) # 将读取的内容append到list中

axis = {"axis":[22,10,33]}
json_content.append(axis)

with open(fjson, 'w') as f_new:
    json.dump(content, f_new)

with open(fjson, 'r') as f:
    content = json.load(f)

axis = {"axis":[22, 10, 11]}
content.update(axis)

with open(fjson, 'w') as f_new:
    json.dump(content, f_new)