Groupby and 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

Group by list python

values = set(map(lambda x:x[1], mylist))
newlist = [[y[0] for y in mylist if y[1]==x] for x in values]

Source: stackoverflow.com

Similar codes

1 vote184 views1 answer
Annaul sum resample pandas
Python
5 votes284 views3 answers
How to run flask in port 80
Python Flask
0 vote182 views1 answer
What hormone causes the feeling of love
Python
2 votes218 views2 answers
Pdf to csv python
Python
3 votes207 views2 answers
Extract column numpy array python
Python
2 votes178 views1 answer
How to make random colors in python turtle
Python
7 votes187 views4 answers
Finding odd even python
Python
0 vote226 views1 answer
Python get last cell value
Python
0 vote187 views1 answer
Python - Cómo Jugar archivo Mp3
Python
6 votes333 views6 answers
Django Redirect
Python Django