我有这样的数据框:
A B C D E
0 2 3 4 8 7
1 4 7 5 9 4
2 3 4 5 7 2
3 8 9 1 3 7
我需要做类似于这样的事情:
if 'value in column A' == 2:
'value for this row in new column' = 'value from column B' + 'value from column C'
elif 'value in column A' == 4:
'value for this row in new column' = 'value from column B' + 'value from column D'
elif 'value in column A' == 8:
'value for this row in new column' = 'value from column B' + 'value from column E'
else:
'value for this row in new column' = 0
我尝试用几种方式来做这件事,例如:
1.
df['sum'][df['A'] == 2] = df['B'] + df['C']
df['sum'][df['A'] == 4] = df['B'] + df['D']
df['sum'][df['A'] == 8] = df['B'] + df['E']
2.
df.loc[df['A'] == 2, 'sum'] = df['B'] + df['C']
df.loc[df['A'] == 4, 'sum'] = df['B'] + df['D']
df.loc[df['A'] == 8, 'sum'] = df['B'] + df['E']
然而,我的结果中有空单元格。
df.fillna(0, axis=1)
。 - Quickbeam2k1