一、json 格式转为 dataframe

from pandas.io.json import json_normalize
import pandas as pd
import json
1
2
3

1. 方法一：

data_str = open('movies.json').read()
df = pd.read_json(data_str,orient = 'records')
1
2

2. 方法二：

data_str = open('movies.json').read()
data_list = json.loads(data_str)
df_1 = json_normalize(data_list)
1
2
3

3. 方法三：

data_str = open('movies.json').read()
data_list = json.loads(data_str)
# d['title']中的'title'是json格式文件里面的名称
data = [[d['title'],d['score'],d['quote'],d['comment_num']] for d in data_list]
df_2 = pd.DataFrame(data,columns = ['title','score','quote','comment_num'])
1
2
3
4
5

二、DataFrame 转 json

import pandas as pd
from pandas import DataFrame as df

data = df([['a', 'b'], ['c', 'd']], index=['row 1', 'row 2'], columns=['col 1', 'col 2'])
1
2
3
4

1. 方法一：

json_columns = data.to_json(orient = "columns")  
1

返回结果： ‘{“col 1”:{“row 1”:“a”,“row 2”:“c”},“col 2”:{“row 1”:“b”,“row 2”:“d”}}’

json_split = data.to_json(orient = "split")   
1

返回结果： ‘{“columns”:[“col 1”,“col 2”],“index”:[“row 1”,“row 2”],“data”:[[“a”,“b”],[“c”,“d”]]}’

json_records = data.to_json(orient = "records")  
1

返回结果： ‘[{“col 1”:“a”,“col 2”:“b”},{“col 1”:“c”,“col 2”:“d”}]’

json_index = data.to_json(orient = "index")  
1

返回结果：‘{“row 1”:{“col 1”:“a”,“col 2”:“b”},“row 2”:{“col 1”:“c”,“col 2”:“d”}}’

json_values = data.to_json(orient = "values")  
1

返回结果： ‘[[“a”,“b”],[“c”,“d”]]’

2. 方法二：

json_dict = data.to_dict(orient = "dict")  
1

返回结果： {‘col 1’: {‘row 1’: ‘a’, ‘row 2’: ‘c’}, ‘col 2’: {‘row 1’: ‘b’, ‘row 2’: ‘d’}}

json_list = data.to_dict(orient = "list")  
1

返回结果： {‘col 1’: [‘a’, ‘c’], ‘col 2’: [‘b’, ‘d’]}

json_series = data.to_dict(orient = "series")  
1

返回结果： {‘col 1’: row 1 a row 2 c Name: col 1, dtype: object, ‘col 2’: row 1 b row 2 d Name: col 2, dtype: object}

json_split = data.to_dict(orient = "split")  
1

返回结果： {‘index’: [‘row 1’, ‘row 2’], ‘columns’: [‘col 1’, ‘col 2’], ‘data’: [[‘a’, ‘b’], [‘c’, ‘d’]]}

json_records = data.to_dict(orient = "records")  
1

返回结果： [{‘col 1’: ‘a’, ‘col 2’: ‘b’}, {‘col 1’: ‘c’, ‘col 2’: ‘d’}]

json_index = data.to_dict(orient = "index")  
1

返回结果：{‘row 1’: {‘col 1’: ‘a’, ‘col 2’: ‘b’}, ‘row 2’: {‘col 1’: ‘c’, ‘col 2’: ‘d’}}

三、输出Json文件

如果要输出JSON文件

将上述得出的字典进行编码 json.dumps() 转化成 json 形式即可：

json.dumps(json_dict)
1