/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 vote273 views1 answer
Ascii to decimal python
Python
25 votes263 views6 answers
Python online compiler
Python
3 votes251 views2 answers
Pandas read excel with two headers
Python
1 vote245 views2 answers
Pandas merge two columns from different dataframes
Python
2 votes253 views2 answers
.items() python
Python
0 vote254 views1 answer
Macos youtube-dl unable to get local issuer certificate _ssl.c:1131
Python
1 vote265 views1 answer
Get value from TextCtrl wxpython
Python
2 votes243 views1 answer
Python argparser flags
Python
0 vote256 views1 answer
Pandas get only entries that match list
Python
0 vote235 views2 answers
Python test if you can convert to int
Python