将数据框转换为具有列表值的字典 [英] Convert Dataframe to a Dictionary with List Values

问题描述

假设我有一个 Dataframe df :

Label1    Label2        Label3
key1      col1value1    col2value1
key2      col1value2    col2value2
key3      col1value3    col2value3


dict1 = df.set_index('Label1').to_dict() 

当我们有2列时，此方法有效.

This works when we have 2 columns..

预期输出:

my_dict = {key1: [col1value1,col2value1] , key2: [ col1value2,col2value2] , key3:[col1value3,col2value3] }

我可以在数据框 df 上使用to_dict以具有 2个其他列作为值的键，以列表的形式?

Can I use to_dict on Dataframe df to have a key with 2 other columns as values in form of list ??

推荐答案

那么您可以使用字典理解和迭代:

Well you could use a dictionary comprehension and iterrows:

print {key:row.tolist() for key,row in df.set_index('Label1').iterrows()}

{'key3': ['col1value3', 'col2value3'],
 'key2': ['col1value2', 'col2value2'], 
 'key1': ['col1value1', 'col2value1']}

此外，我认为以下内容也可以使用:

Also, I think the following will work too:

df = df.set_index('Label1')
print df.T.to_dict(outtype='list')

{'key3': ['col1value3', 'col2value3'],
 'key2': ['col1value2', 'col2value2'],
 'key1': ['col1value1', 'col2value1']}

截至2017年秋季的更新; outtype不再是关键字参数.改用orient:

Update as of fall 2017; outtype is no longer the keyword argument. Use orient instead:

In [11]: df.T.to_dict(orient='list')
Out[11]: 
{'key1': ['col1value1', 'col2value1'],
 'key2': ['col1value2', 'col2value2'],
 'key3': ['col1value3', 'col2value3']}

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