Open and read multiple text files and match words

[kozaizsvemira]

Hi,

How can I create a script that reads two text files and prints out words that match within text file number 1?
This code below is the furthest I got, it can match words in string and print it out, but I need it to read two or more large text files and print same found matched words. Thank you.

import re

def get_words_from_string(s):
    return set(re.findall(re.compile('\w+'), s.lower()))

def get_words_from_file(fname):
    with open(fname, 'rb') as inf:
        return get_words_from_string(inf.read())

def all_words(needle, haystack):
    return set(needle).issubset(set(haystack))

def any_words(needle, haystack):
    return set(needle).intersection(set(haystack))

search_words = get_words_from_string("this my test")
find_in = get_words_from_string("If this were my test, I is passing")

print (search_words)