python - 无法替换 json 对象中的参数值

Question

我正在尝试替换 json 对象中变量的值，但我无法这样做。我想替换 json_input 变量中日期时间的值，但截至目前日期时间正在连接

json_input='{"provider_code":"test","provider_resource_id":{"name":"test","value":"test"},"provider_account":"123","kpis":[{"kpi":"kpis","value":"80","unit":"%","datetime":""}]}'


newjson = {}
try:
    decoded = json.loads(json_input)

    # Access data
    for x in decoded['kpis']:
         if not (x['datetime']):
               x['datetime']="2019-07-05T18:17:08.257Z"
             newjson=json_input+x['datetime']
except (ValueError, KeyError, TypeError):
    print("JSON format error")
print(newjson)

*Actual*
new json = {"provider_code":"aws","provider_resource_id":{"name":"app_arn","value":"arn:aws:elasticbeanstalk:us-east-1:802878444238:application/mcms-eb-test"},"provider_account":"802878444238","kpis":[{"kpi":"aws.elasticbeanstalk.health_status","value":"80","unit":"%","datetime":""}]}2019-07-05T18:17:08.257Z

*Expected*
new json='{"provider_code":"test","provider_resource_id":{"name":"test","value":"test"},"provider_account":"123","kpis":[{"kpi":"kpis","value":"80","unit":"%","datetime":"2019-07-05T18:17:08.257Z"}]}'

Answer 1

您的问题似乎是您正在将 json_input 写入 newjson，而您确实想将 decoded 写入 newjson，因为 decoded 是您要修改的对象。 json_input 永远不会被修改，它仅用于在 Python 中创建 JSON 表示。此外，+x['datetime'] 没有任何帮助，并且可能是导致 newjson 末尾添加日期时间的原因。

不要使用 newjson=json_input+x['datetime']，而是尝试 newjson = demod.dumps()。