python更新json文件

最新推荐文章于 2024-07-18 17:59:42 发布

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最新推荐文章于 2024-07-18 17:59:42 发布

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分类专栏：技术杂谈文章标签： json python 更新文件

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有json文件如下：

{"info": 
[{"platform": 1, "toptype": 1, "flag": 1}, {"platform": 1, "toptype": 2, "flag": 1}, 
{"platform": 1, "toptype": 3, "flag": 1}, {"platform": 1, "toptype": 4, "flag": 1}, 
{"platform": 2, "toptype": 1, "flag": 1}, {"platform": 2, "toptype": 2, "flag": 1}, 
{"platform": 2, "toptype": 3, "flag": 1}, {"platform": 2, "toptype": 4, "flag": 1}, 
{"platform": 3, "toptype": 1, "flag": 1}, {"platform": 3, "toptype": 2, "flag": 1}, 
{"platform": 3, "toptype": 3, "flag": 1}, {"platform": 3, "toptype": 4, "flag": 1}
]}

我要把flag更新一下：

import json
import os

path = os.path.abspath('read.json')
platform_list = [
    1,
    2,
    3
]

toptype_list = [
    1,
    2,
    3,
    4
]

for platform in platform_list:
    for toptype in toptype_list:
        with open(path, 'r+') as f:
            item = json.load(f)
            infos = item['info']
            for i,info in enumerate(infos):
                if info['platform'] == platform and info['toptype'] == toptype and info['flag'] == 1:
                    info['flag'] = i
                    f.seek(0)
                    f.write(json.dumps(item))
                    f.truncate()

于是json文件变成了：

{"info": 
[{"platform": 1, "toptype": 1, "flag": 0}, {"platform": 1, "toptype": 2, "flag": 1},
 {"platform": 1, "toptype": 3, "flag": 2}, {"platform": 1, "toptype": 4, "flag": 3},
 {"platform": 2, "toptype": 1, "flag": 4}, {"platform": 2, "toptype": 2, "flag": 5},
 {"platform": 2, "toptype": 3, "flag": 6}, {"platform": 2, "toptype": 4, "flag": 7},
 {"platform": 3, "toptype": 1, "flag": 8}, {"platform": 3, "toptype": 2, "flag": 9},
 {"platform": 3, "toptype": 3, "flag": 10}, {"platform": 3, "toptype": 4, "flag": 11}
]}

以上