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

1 vote346 views1 answer
Sum values in django models
Python
0 vote288 views1 answer
Cg
Python
0 vote298 views1 answer
Python background process
Python
0 vote302 views1 answer
Divide a column value in pandas dataframe
Python
0 vote283 views1 answer
Python selenium extensions
Python
0 vote272 views1 answer
How to create simple window in wxPython
Python
9 votes278 views6 answers
Add list python
Python
2 votes304 views4 answers
How to create dictionary in python from csv
Python
1 vote246 views1 answer
Format listto string pytthon
Python
1 vote286 views2 answers
Python dequeu
Python