/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 vote174 views1 answer
Add row in db django
Python Django
0 vote144 views1 answer
Quoto x discord selfbot
Python
0 vote136 views1 answer
How to delete a csv file in python
Python
7 votes152 views4 answers
Python file to list
Python
0 vote152 views2 answers
Convert time series to transition matrix
Python
0 vote138 views1 answer
Python use string to get object attributes
Python
1 vote165 views1 answer
ValueError: Failed to convert a NumPy array to a Tensor (Unsupported object type float).
Python
0 vote141 views1 answer
Print e
Python
2 votes164 views4 answers
Python how to count items in array
Python
0 vote143 views1 answer
Python collections Counter sort by key
Python