How define iteration interval increment

[SriMekala]

Hi,

I want to iterate through df rows and increase the iteration step increment by 3 (increment i=i+3 on each iteration). I use the below code, but it's not happening what I want to do. Please help me, someone.

import pandas as pd
import csv
input=r'D:\PythonCodes\correctiofactordata.csv'
df=pd.read_csv(input)
for i, row in df.iterrows():
    print(i)
    i+=3

my input data:

Time_golden	Golden	is_golden	Factor
20-03-2019 10:24	98.6	golden	1.0
20-03-2019 11:10	97.0	golden	1.3
20-03-2019 13:13	96.0	golden	1.5
21-03-2019 13:43	95.0	golden	0.95
23-03-2019 10:37	94.6	golden	0.96
23-03-2019 18:43	93.0	golden	1.0
24-03-2019 22:19	92.0	golden	1.3
25-03-2019 09:23	90.0	golden	1.5
26-03-2019 11:42	89.0	golden	0.95
27-03-2019 20:32	87.3	golden	0.96
27-03-2019 23:42	86.0	golden	1.5
28-03-2019 00:52	84.0	golden	0.95
28-03-2019 03:40	82.3	golden	0.96
21-03-2019 10:34	83.0	notgolden	1.0
24-03-2019 16:37	80.0	notgolden	1.3
24-03-2019 21:42	73.0	notgolden	0.95
27-03-2019 21:02	60.0	notgolden	0.96
28-03-2019 02:42	53.0	notgolden	1.0
20-03-2019 10:24	98.6	golden	1.3
20-03-2019 11:10	97.0	golden	1.5
20-03-2019 13:13	96.0	golden	0.95
21-03-2019 13:43	95.0	golden	0.96
23-03-2019 10:37	94.6	golden	1.5
23-03-2019 18:43	93.0	golden	0.95
24-03-2019 22:19	92.0	golden	0.96
25-03-2019 09:23	90.0	golden	1.0
26-03-2019 11:42	89.0	golden	1.3
27-03-2019 20:32	87.3	golden	1.3
27-03-2019 23:42	86.0	golden	1.0