How do i have python3 search for a specific string in a text file

All I'm trying to do is have the program look for a specific string and if the file contains that string add to a variable and if not just print that it didn't work. But it keeps saying that the string was not found when i know it is in the file.

for line in open("/home/cp/Desktop/config"):
    if "PermitRootLogin no" in line:
        num_of_points1 = num_of_points1 + 4
        num_of_vulns1 = num_of_vulns1 + 1
    else:
        print('sshd_config is still vulnerable')
        break

This is the file its reading off of

This should work
Possibly
PermitRootLogin no
hmmmmmmmmmm
aaa

What i want it to do is find that "PermitRootLogin no" in the file but it just keeps acting like that string was never found. And printing the else statement. When i was looking for tutorials they all were trying to do something else so i'm open to any suggestions. Thank You in advanced im just really stuck.