replaced with []

Top one is actually quite good. If it were for real, I would write it as a proper named function. That way is real nice for avoiding duplication, and something I didn't think of.

def is_palindrome(s: str):
    processed_text = ''.join(c for c in s.upper() is c.isalpha())
    return (lambda x: x == x[::-1])(processed_text)

100% cursed. Love it.

24 characters shorter, and I respected proper formatting rules (still a joke solution though).

CANDELA

Correction*

In Python, the description examples use sets instead of lists.

As we know, sets in python are declared with {} as an unordered collection of elements, so a fix to declare them as lists would be appropriate.

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In Python, the description description examples use sets instead of lists.

As we know, arrays in python are declared with {} and are an unordered collection of elements, so a fix to declare them as lists would be appropriate.