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group by list python

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Dark Deer answered on January 14, 2021 Popularity 10/10 Helpfulness 3/10

answer group by list python

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group by list python

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

Popularity 10/10 Helpfulness 3/10 Language python

Source: stackoverflow.com

Tags: group-by list python

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Contributed on Jan 14 2021

Dark Deer

0 Answers Avg Quality 2/10

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groupby and list

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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]

Popularity 10/10 Helpfulness 3/10 Language python

Source: stackoverflow.com

Tags: group-by group-b

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Contributed on Feb 10 2021

Defeated Dragonfly

0 Answers Avg Quality 2/10

.group() python

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. ^ $ * + ? { } [ ] \ | ( )

Popularity 9/10 Helpfulness 2/10 Language python

Source: docs.python.org

Tags: python py

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Contributed on Mar 05 2023

Friendly Flatworm

0 Answers Avg Quality 2/10

groupby in python

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# car_sales:> it is dataframe
# "Make" is column, or feature name
# operation is mean
car_sales.groupby(["Make"]).mean()

Popularity 10/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: group-by group-b

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Contributed on Jul 31 2022

Sleepy Scarab

0 Answers Avg Quality 2/10

group by list python

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