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

0 vote99 views3 answers
Convert c code to python code online
Python
1 vote98 views1 answer
X= [10] def List_ex(): x.append(20) def add_list(): x=[30,40] x.append(50) print (x) List_ex() print (x) add_list() print (x)
Python
0 vote109 views1 answer
Sorting decimal numbers in python
Python
1 vote104 views1 answer
How to loc all cells except python
Python
0 vote135 views1 answer
Quill get content flask
Python Flask
0 vote114 views1 answer
Running mean
Python
0 vote106 views2 answers
Convert all colnames of dataframe to upper
Python
0 vote105 views1 answer
Python get next item from generator
Python
10 votes194 views1 answer
Is not none python
Python
0 vote106 views1 answer
Pandas read csv file header column not equal data columns
Python