List of dataframes to dataframe of lists

Question

How to convert a list of dataframes to a dataframe of lists? For example:

lst = [pd.DataFrame({'A': [1, 2], 'B': [10, 20]}),
       pd.DataFrame({'A': [3, 4, 5], 'B': [30, 40, 50]})]

Expected result:

           A             B
0     [1, 2]      [10, 20]
1  [3, 4, 5]  [30, 40, 50]

My real list contains thousands of dataframes.

Ignatius Reilly · Accepted Answer · 2022-08-27 02:41:07Z

2

lst = [pd.DataFrame({'A': [1, 2], 'B': [10, 20]}),
       pd.DataFrame({'A': [3, 4, 5], 'B': [30, 40, 50]})]

dic_lst = [df.to_dict(orient='list') for df in lst]

pd.DataFrame(dic_lst)

answered Aug 27, 2022 at 2:41

Ignatius Reilly

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2 Comments

Ignatius Reilly Over a year ago

Don't know how efficient it's for thousands of dataframes... but it's the most straightforward solution I can think of.

mozway Over a year ago

Nice one. It should be quite fast ;)

BENY · Accepted Answer · 2022-08-27 03:33:11Z

2

We could do

out = pd.concat(dict(enumerate(lst))).groupby(level=0).agg(list)
Out[1053]: 
           A             B
0     [1, 2]      [10, 20]
1  [3, 4, 5]  [30, 40, 50]

answered Aug 27, 2022 at 3:33

BENY

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