Python 3.6: How can I open a text file into two sets and check intersections – SEO

I am currently starting out with Python 3.6 and using the IDLE development area. I have been looking online for a solution to the following problem:

I have two text files. The first is my input list, the second is my blacklist. I want to check for any instances where a line in my input list is also in my blacklist. The end goal will be to create a new list that contains all the intersections.

I am currently doing the following:

input_list=set(line.strip() for line in open("input_list.txt",'r'))
black_list=set(line.strip() for line in open("black_list.txt",'r'))

print("Input List")
print(input_list)
print("Black List")
print(black_list)
print("Intersection")
print(input_list.intersection(black_list))

I will explain my reasoning so hopefully people can correct my logic with their answers, not just provide a solution.

input_list=set(line.strip() for line in open("input_list.txt",'r'))
black_list=set(line.strip() for line in open("black_list.txt",'r'))

With the above two lines of code I am opening two sets. Each one strips out all of the n values and leaves me with just the text from each line.

print("Input List")
print(input_list)
print("Black List")
print(black_list)

This section is simply for me to check my text files have been opened, and all the values are present in the set. There is a header above each section for clarity.

print("Intersection")
print(input_list.intersection(black_list))

In this piece of code I start with a header. I then try to print any intersection values that are found. Currently the result that I get in my shell looks like this:

Input List
{'value1', 'value2', 'value3'}
Black List
{'valueA', 'valueB', 'valueC'}
Intersection
set()

I got my information about intersection from the following link:

https://docs.python.org/3/tutorial/datastructures.html

I got my file opening into sets from this article:

Python: load words from file into a set

I have been reading The Python Manual, Volume 33 from the Black Dog i-Tech Series. I used this to learn the basics for Python. Whilst it covers basic open, reading, and writing – it does not cover more complex features.

I’m mostly designing this to create a tool for inputting domains, and checking against a blacklist of bad domains. This is to be used for SEO purposes and help me to quickly produce a disavow file. Aside from being practical for my work, this is also just a personal project to help me explore, learn, and develop my understanding of Python.