Question

Write a function named words_in_both that takes two strings as parameters and returns a set of the words contained in both strings. You can assume all characters are letters or spaces. Capitalization shouldn't matter: "to", "To", "tO", and "TO" should all count as the same word. The words in the set should be all lower-case. For example, if one string contains "To", and the other string contains "TO", then the set should contain "to".

The file must be named: words_in_both.py

Written in Python and NOT C++

Answer 1

def words_in_both(s1, s2):
    words1 = set(s1.lower().split(" "))
    words2 = set(s2.lower().split(" "))
    return words1.intersection(words2)

# Testing
print(words_in_both("This is my MY test1","This IS My MY mY test2"))

$\color{blue}\underline{Output:}$

{'this', 'my', 'is'} Process finished with exit code o