Reading integers from a file; the problem may be the newline characters

[JRWoodwardMSW]

I want to read integers from a file. The delimiter is " " (a space).
I am getting the list of strings read into the program, but the error message is:

ValueError: invalid literal for int() with base 10:

Here is my code:

import os
os.path.join("Users", "admin", "PycharmProjects", "althhoff", "open_nums_test.txt")
f = open('open_nums_test.txt', "r")
test_list = f.readlines()
print (test_list)
test_list = list(map(int, test_list))
print("Integer list is : " + str(test_list))

When I print(test_list), I notice than both lists end in newlines - '\n'. Is the newline character causing the ValueError? Is map choking as it tries to int a "\n"? If so, what can I do about it?