python - 如何在 Python 中解析 JSON 文件中的值

Question

我正在尝试从 json 文件中获取值，但我收到的错误是 TypeError: expected string or buffer。我正在正确解析文件，而且我猜我的 json 文件格式也是正确的。我哪里出错了？

这两个文件都在同一目录中。

主文件.py

import json

json_data = open('meters_parameters.json')

data = json.loads(json_data)  // TypeError: expected string or buffer
print data
json_data.close()

meters_parameters.json

{
    "cilantro" : [{
        "cem_093":[{
            "kwh":{"function":"3","address":"286","length":"2"},
            "serial_number":{"function":"3","address":"298","length":"2"},
            "slave_id":{"function":"3","address":"15","length":"2"}
        }]
    }],
    "elmeasure" : [{
        "lg1119_d":[{
            "kwh":{"function":"3","address":"286","length":"2"},
            "serial_number":{"function":"3","address":"298","length":"2"},
            "slave_id":{"function":"3","address":"15","length":"2"}
        }]
    }]
}

Answer 1

loads 需要一个字符串而不是文件句柄。您需要 json.load:

import json

with open('meters_parameters.json') as f:
    data = json.load(f)
print data