#To round to nearest 5

import numpy as np

import pandas as pd

df

>>>

0  34.36

1  1571.80

2  12.54

​

np.around(df.A.values/5, decimals=0)*5

>>> array([35., 1570., 15.])

#OR 

ar = np.array([34.36, 1571.80, 12.54])

np.around(ar/5, decimals=0)*5

>>> array([35., 1570., 15.])

​