pandas read_json:“如果使用所有标量值，则必须传递索引"

问题描述

在导入带有熊猫的JSON文件时遇到一些困难.

I have some difficulty in importing a JSON file with pandas.

import pandas as pd
map_index_to_word = pd.read_json('people_wiki_map_index_to_word.json')

这是我得到的错误:

ValueError: If using all scalar values, you must pass an index

文件结构是这样简化的:

The file structure is simplified like this:

{"biennials": 522004, "lb915": 116290, "shatzky": 127647, "woode": 174106, "damfunk": 133206, "nualart": 153444, "hatefillot": 164111, "missionborn": 261765, "yeardescribed": 161075, "theoryhe": 521685}

它来自华盛顿大学Coursera的机器学习课程.您可以找到文件此处.

It is from the machine learning course of University of Washington on Coursera. You can find the file here.

推荐答案

尝试

ser = pd.read_json('people_wiki_map_index_to_word.json', typ='series')

该文件仅包含值是标量的键值对.您可以使用ser.to_frame('count')将其转换为数据框.

That file only contains key value pairs where values are scalars. You can convert it to a dataframe with ser.to_frame('count').

您还可以执行以下操作:

You can also do something like this:

import json
with open('people_wiki_map_index_to_word.json', 'r') as f:
    data = json.load(f)

现在数据是一个字典.您可以将其传递给数据框构造函数，如下所示:

Now data is a dictionary. You can pass it to a dataframe constructor like this:

df = pd.DataFrame({'count': data})

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