如何使用这个JSON文件中的密钥创建一个Pandas DataFrame？

import pandas as pd
import json

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

df = pd.DataFrame()

for key in data.keys():
    df[key] = data[key]

import pandas as pd
import json

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

df = pd.DataFrame()

for key in data.keys():
    df[key] = data[key]