Pandas处理json文件

用Pandas读取json文件，截取其中一段json文件如下图：

{"minutes": 30, "created_at": "2016-05-01 00:00:10", "user_id": 199071, 
"lab": "\u7528\u6237\u53ca\u6587\u4ef6\u6743\u9650\u7ba1\u7406", 
"course": "Linux \u57fa\u7840\u5165\u95e8\uff08\u65b0\u7248\uff09"}

编写一个解析并统计学习数据的函数，统计user_id的总学习时间和学习次数。

用pandas.read_json读取json文件，代码如下：

import pandas as pd


def analysis(file, user_id):

    with open(file, 'r') as f:
        if not f:
            return 0
        df = pd.read_json(f, orient='records')
        dfs = df[df['user_id'] == user_id]
        times = dfs.shape[0]
        minutes = dfs['minutes'].sum()

    return times, minutes


if __name__ == '__main__':
    result = analysis('user_study.json', 199071)
    print(result)