/Python/Pandas convert entries in a column after groupby in list

Pandas convert entries in a column after groupby in list

In [1]: df = pd.DataFrame( {'a':['A','A','B','B','B','C'], 'b':[1,2,5,5,4,6]})
        df

Out[1]: 
   a  b
0  A  1
1  A  2
2  B  5
3  B  5
4  B  4
5  C  6

In [2]: df.groupby('a')['b'].apply(list)
Out[2]: 
a
A       [1, 2]
B    [5, 5, 4]
C          [6]
Name: b, dtype: object

In [3]: df1 = df.groupby('a')['b'].apply(list).reset_index(name='new')
        df1
Out[3]: 
   a        new
0  A     [1, 2]
1  B  [5, 5, 4]
2  C        [6]

Source: stackoverflow.com

Pandas convert entries in a column after groupby in list

df.groupby('a').agg({'b':lambda x: list(x)})

Source: stackoverflow.com

Similar codes

0 vote227 views1 answer
Django add queury parameters to reverse
Python Django
0 vote188 views1 answer
How to get minimum value in list python
Python
1 vote244 views1 answer
Dot notation python
Python
0 vote193 views1 answer
Type of tuple in python
Python
0 vote224 views1 answer
Access Google Photo API with Python using google-api-python-client
Python
-1 vote201 views3 answers
Play Video in Google Colab
Python
0 vote181 views1 answer
Python If Boolean example
Python
18 votes359 views3 answers
Export flask app
Python Flask
4 votes193 views1 answer
Tkinter frame example
Python
0 vote300 views1 answer
Select specific column names from dataframe
Python