Python KeyError JSON

Question

我正在尝试从JSON文件中获取某些特定数据，但出现以下错误：

for item in data['perfil'][0]['regimes']: KeyError: 'regimes'

这是我的脚本，如您所见，我正在尝试获取密钥regimes，因为它具有特定的数据，而其他人却没有：

import json
import matplotlib.pyplot as plt

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

for item in data['perfil'][0]['regimes']:
    print(item['classificacao'])

这是Json File的一个小副本：

{
"perfil":[
    {
        "data": 1533815887,
        "kmh": 0,
        "rpm": 0.0,
        "pedal": 15.294117647058824
    },
    {
        "data": 1533815888,
        "kmh": 0
        ,"rpm": 0.0
        ,"pedal": 15.294117647058824
    },
    {
        "data": 1533815889,
        "kmh": 0
        ,"rpm": 0.0
        ,"pedal": 15.294117647058824
    },
    {
        "kmh": 0
        ,"rpm": 834.75
        ,"pedal": 14.117647058823529
    },
    {
        "regimes": [
            {
                "kmh": 0,
                "rpm": 833.75,
                "pedal": 14.117647058823529,
                "regime_inferior_normal": 318,
                "regime_normal": 27,
                "regime_agressivo": 1,
                "regime_muito_agressivo": 0,
                "soma_regimes": 346,
                "classificacao": "Regime Inferior a Normal"
            }
        ]
    },
    {
        "kmh": 0,
        "rpm": 827.5,
        "pedal": 14.117647058823529
    }
]
}

如何获取关键“制度”中的数据？

Answer 1

以防万一，如果您的json中包含多个制式。我假设是这样，因为您只给出了原始json的一部分

for i in js['perfil']:
    if 'regimes' in i:
        print(i['regimes'][0]['classificacao'])

通过这种方式，程序循环遍历每个json对象，并检查键regimes。如果存在，它将被打印

Answer 2

尝试这段代码：-

data['perfil'][4]['regimes'][0]['classificacao']

确保所使用的索引正确。