Group by list python

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

3 votes179 views2 answers
Django rest framework simple jwt
Python
19 votes173 views1 answer
Get requests from python
Python
49 votes173 views6 answers
Python measure time
Python
4 votes240 views2 answers
How to take two integers as input in python
Python
2 votes160 views1 answer
How to change the console background color in python
Python
1 vote171 views2 answers
Change xticks python
Python
0 vote200 views1 answer
Get the positions of items of ser2 in ser1 as a list python
Python
0 vote213 views1 answer
What is *args and **kwargs in django
Python Django
1 vote162 views2 answers
How to add numbers in python using for loop
Python
7 votes175 views1 answer
Python with file.open
Python