당신은 같은 []
에 열을 지정해야합니다
df.groupby('croho subonderdeel')['2011 MAN', '2012 MAN'].sum()
필요 2 columns
출력 매개 변수 as_index=False
추가 또한 경우 :
df.groupby('croho subonderdeel', as_index=False)['2011 MAN'].sum()
또는 :
df.groupby('croho subonderdeel')['2011 MAN'].sum().reset_index()
그러나 2 개 종류 (2 열)하여 원하는 그룹을 추가하는 경우 []
groupby
에 :
df.groupby(['croho subonderdeel', 'another col'])['2011 MAN'].sum()
샘플 :
df = pd.DataFrame({'another col':list('efefef'),
'2011 MAN':[4,5,4,5,5,4],
'2011 WROUW':[7,8,9,4,2,3],
'2012 MAN':[1,3,5,7,1,0],
'2012 WROUW':[5,3,6,9,2,4],
'croho subonderdeel':list('aaabbb')})
print (df)
2011 MAN 2011 WROUW 2012 MAN 2012 WROUW another col croho subonderdeel
0 4 7 1 5 e a
1 5 8 3 3 f a
2 4 9 5 6 e a
3 5 4 7 9 f b
4 5 2 1 2 e b
5 4 3 0 4 f b
print(df.groupby('croho subonderdeel')['2011 MAN'].sum())
croho subonderdeel
a 13
b 14
Name: 2011 MAN, dtype: int64
print(df.groupby('croho subonderdeel', as_index=False)['2011 MAN'].sum())
croho subonderdeel 2011 MAN
0 a 13
1 b 14
print(df.groupby('croho subonderdeel')['2011 MAN'].sum().reset_index())
croho subonderdeel 2011 MAN
0 a 13
1 b 14
print(df.groupby('croho subonderdeel')['2011 MAN', '2012 WROUW'].sum())
2011 MAN 2012 WROUW
croho subonderdeel
a 13 14
b 14 15
print(df.groupby('croho subonderdeel', as_index=False)['2011 MAN', '2012 WROUW'].sum())
croho subonderdeel 2011 MAN 2012 WROUW
0 a 13 14
1 b 14 15
print (df.groupby(['croho subonderdeel', 'another col'])['2011 MAN'].sum())
croho subonderdeel another col
a e 8
f 5
b e 5
f 9
Name: 2011 MAN, dtype: int64
print (df.groupby(['croho subonderdeel', 'another col'], as_index=False)['2011 MAN'].sum())
croho subonderdeel another col 2011 MAN
0 a e 8
1 a f 5
2 b e 5
3 b f 9
print (df.groupby(['croho subonderdeel', 'another col']).sum())
2011 MAN 2011 WROUW 2012 MAN 2012 WROUW
croho subonderdeel another col
a e 8 16 6 11
f 5 8 3 3
b e 5 2 1 2
f 9 7 7 13
print (df.groupby(['croho subonderdeel', 'another col'], as_index=False).sum())
croho subonderdeel another col 2011 MAN 2011 WROUW 2012 MAN 2012 WROUW
0 a e 8 16 6 11
1 a f 5 8 3 3
2 b e 5 2 1 2
3 b f 9 7 7 13
의미가 있습니다
! 왜 '2011 MAN'은 대괄호 안에 있어야하며 'croho subonderdeel'은 아닌가? 'croho subonderdeel'은 칼럼이기도하지만 둥근 괄호를 넣으면 작동합니다. –
두 가지가 있습니다 :'groupby'에서 2 열을 사용하고 2 열로 그룹화하고 집계를 위해 열을 지정하는 경우'function 'groupby 외부에서'[]'를 사용하십시오. – jezrael
SQL처럼 채워진 모든 셀에'reset_index()'를 추가 할 수도 있습니다. – harshil9968