# oop/static.methods.py
class StringUtil:

    @staticmethod
    def is_palindrome(s, case_insensitive=True):
        # we allow only letters and numbers
        s = ''.join(c for c in s if c.isalnum())  # Study this!
        # For case insensitive comparison, we lower-case s
        if case_insensitive:
            s = s.lower()
        for c in range(len(s) // 2):
            if s[c] != s[-c -1]:
                return False
        return True

    @staticmethod
    def get_unique_words(sentence):
        return set(sentence.split())

print(StringUtil.is_palindrome(
    'Radar', case_insensitive=False))  # False: Case Sensitive
print(StringUtil.is_palindrome('A nut for a jar of tuna'))  # True
print(StringUtil.is_palindrome('Never Odd, Or Even!'))  # True
print(StringUtil.is_palindrome(
    'In Girum Imus Nocte Et Consumimur Igni')  # Latin! Show-off!
)  # True

print(StringUtil.get_unique_words(
    'I love palindromes. I really really love them!'))
# {'them!', 'palindromes.', 'I', 'really', 'love'}


"""
$ python static.methods.py
False
True
True
True
{'them!', 'palindromes.', 'I', 'really', 'love'}
"""