/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

2 votes268 views2 answers
Python django query
Python Django
3 votes203 views1 answer
Numpy factorial
Python
1 vote212 views1 answer
Python remove n random elements from a list
Python
12 votes201 views3 answers
Pandas xlsx to dataframe
Python
0 vote207 views1 answer
Can list hold different data types in python
Python
0 vote200 views1 answer
Slicing tuples
Python
1 vote220 views1 answer
Django sessions for beginners
Python Django
0 vote202 views1 answer
Flask remove file after send_file
Python
3 votes178 views3 answers
Nested loop in list comprehension
Python
0 vote182 views1 answer
Convert utc to gmt+7 pandas
Python