object.__repr__(self): called by the repr() built-in function and by string conversions (reverse quotes) to compute the "official" string representation of an object. object.__str__(self): called by ...

in_str (str): The input string to check. if ('a' in in_str and 'e' in in_str and 'i' in in_str and 'o' in in_str and 'u' in in_str): ...