Slice multiple column ranges with Pandas

问题:

Suppose I have 20 Columns in a data set and i want to use 19 as an input. and input columns are columns from 1:10 and 12: 20. and I want to use 11th column as an output. so how to give this kind of range using pandas?

for example: Example Data Set

consider above data it have 4 columns but i have to take input only 3 columns but those columns are b,d,e and i want to skip c column. Right now i m using input = dftrain.loc[:,:'e'] which consider all 4 columns.

回答1:

Option 1
np.r_

idx = np.r_[0:11, 12:20]

idx
array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 12, 13, 14, 15, 16, 17,
       18, 19])

Pass this to iloc -

df.iloc[:, 11] = df.iloc[:, idx].sum(axis=1) # sum, for example

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Option 2
pd.IndexSlice

idx = pd.IndexSlice[0:11, 12:20]

idx
(slice(0, 11, None), slice(12, 20, None))

You can use idx in the same manner as before.