int_string = input("What is the initial string? ")
int_string = int_string.lower()

How do I make the input case insensitive

class CaseInsensitiveStr(str):def __eq__(self, other):return str.__eq__(self.lower(), other.lower())def __ne__(self, other):return str.__ne__(self.lower(), other.lower())def __lt__(self, other):return str.__lt__(self.lower(), other.lower())def __gt__(self, other):return str.__gt__(self.lower(), other.lower())def __le__(self, other):return str.__le__(self.lower(), other.lower())def __ge__(self, other):return str.__ge__(self.lower(), other.lower())int_string = CaseInsensitiveStr(input("What is the initial string? "))

If you don't like all the repetitive code, you can utilise total_ordering to fill in some of the methods like this.

from functools import total_ordering@total_ordering
class CaseInsensitiveMixin(object):def __eq__(self, other):return str.__eq__(self.lower(), other.lower())def __lt__(self, other):return str.__lt__(self.lower(), other.lower())class CaseInsensitiveStr(CaseInsensitiveMixin, str):pass

Testcases:

s = CaseInsensitiveStr("Foo")
assert s == "foo"
assert s == "FOO"
assert s > "bar"
assert s > "BAR"
assert s < "ZAB"
assert s < "ZAB"