deleting columns in CSV file

[snippsat]

import pandas as pd

data = {
    1: [1, 19, 20, 21, 25, 29, 30, 31, 30, 29, 31],
    2: [2, 10, 20, 20, 20, 10, 10, 20, 20, 10, 10],
    3: [3, 10, 20, 20, 20, 10, 10, 20, 20, 10, 10],
    4: [4, 10, 20, 20, 20, 10, 10, 20, 20, 10, 10],
}

df = pd.DataFrame(data)

Delete columns from 2 to 4,adjust as needed.

>>> df
     1   2   3   4
0    1   2   3   4
1   19  10  10  10
2   20  20  20  20
3   21  20  20  20
4   25  20  20  20
5   29  10  10  10
6   30  10  10  10
7   31  20  20  20
8   30  20  20  20
9   29  10  10  10
10  31  10  10  10

>>> df.drop(df.columns[2:4], axis=1, inplace=True)
>>> df
     1   2
0    1   2
1   19  10
2   20  20
3   21  20
4   25  20
5   29  10
6   30  10
7   31  20
8   30  20
9   29  10
10  31  10