pandas groupby list code example
Example 1: group by pandas to list
df.groupby('a')['b'].apply(list)
Example 2: 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]
Example 3: 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]
Example 4: pandas groupby
data.groupby('month', as_index=False).agg({"duration": "sum"})
Example 5: list out the groups from groupby
g = x.groupby('Color')
g.groups.keys()