Finding an array elements location in a pandas frame column (a.k.a pd.series)

Question

I have a pandas frame similar to this one:

import pandas as pd
import numpy as np

data = {\'Col1\' : [4,5,6,7], \'Col2\' : [10,20,30,40], \'Col3\' : [100,5         


        

Answer 1

df.index[df.Col4.isin(target_array)]