通过列将函数应用于 pandas 数据帧 [英] Applying function to Pandas dataframe by column
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问题描述
所以我不想明确说明这些列,我想动态地选择我想要的列,然后调用函数,例如
如何实现类似于<数据框中列的
如果column.name!='manager':
apply function()
解决方案
我想你可以先找到所有列c $ c> list comprehension 然后 申请
func
:
import pandas as pd
df = pd.DataFrame({'A':[1,2,3],
'B':[4 ,5,6],
'C':[7,8,9],
'D':[1,3,5],
'E':[5,3 ,6],
'F':[7,4,3]})
print(df)
ABCDEF
0 1 4 7 1 5 7
1 2 5 8 3 3 4
2 3 6 9 5 6 3
cols = [col for col in df.columns如果col!='B']
print(cols)
['A','C','D','E','F']
def func(x):
return x + 1
df [cols] = df [cols] .apply(func)
print(df)
ABCDEF
0 2 4 8 2 6 8
1 3 5 9 4 4 5
2 4 6 10 6 7 4
布尔索引的另一个解决方案:
cols = df.columns [df.columns!='B']
print(cols)
索引(['A','C','D','E','F'],dtype ='object')
I have a function which I want to apply to certain columns of a pandas dataframe. So rather than explicitly stating the columns, I want to dynamically select the columns I want and then call the function e.g.
How to implement something like:
for column in dataframe:
if column.name != 'manager':
apply function():
解决方案
I think you can first find all columns by list comprehension
and then apply
func
:
import pandas as pd
df = pd.DataFrame({'A':[1,2,3],
'B':[4,5,6],
'C':[7,8,9],
'D':[1,3,5],
'E':[5,3,6],
'F':[7,4,3]})
print (df)
A B C D E F
0 1 4 7 1 5 7
1 2 5 8 3 3 4
2 3 6 9 5 6 3
cols = [col for col in df.columns if col != 'B']
print (cols)
['A', 'C', 'D', 'E', 'F']
def func(x):
return x + 1
df[cols] = df[cols].apply(func)
print (df)
A B C D E F
0 2 4 8 2 6 8
1 3 5 9 4 4 5
2 4 6 10 6 7 4
Another solution with boolean indexing:
cols = df.columns[df.columns != 'B']
print (cols)
Index(['A', 'C', 'D', 'E', 'F'], dtype='object')
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