You need to read the file first, then put the result into the array
and then search the value of the array

import csv with open("lookup.csv") as f: reader = csv.reader(f, delimiter=',') dict_lookup = {r[0]:r[1] for r in reader} print(dict_lookup) print(dict_lookup['test2'])

Output

{'test1': 'output1', 'test2': 'output2', 'test3': 'output3'} output2

If the content of lookup.csv is

test1,output1 test2,output2 test3,output3

This is a very basic operation of using the csv module, it is recommended to take a look