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The basic Python way

We can initialize an empty list, read the file line by line, split each line, and append the second element to our list:

evens = []
with open as f:
    for line in f.readlines():
        evens.append(line.split()[1])

Of course, you can also do this in a one-liner:

evens = [int(x.split()[1]) for x in open('evens.txt').readlines()]

We are just trying to go step by step, following the Zen of Python: simple is better than complex.