Source code for kyu_8.alternating_case.alternating_case

#  Created by Egor Kostan.
#  GitHub: https://github.com/ikostan
#  LinkedIn: https://www.linkedin.com/in/egor-kostan/


def to_alternating_case(string: str) -> str:
    """
    each lowercase letter becomes uppercase and
    each uppercase letter becomes lowercase
    :param string:
    :return:
    """

    return ''.join((char.upper() if char.islower() else char.lower()) for char in string)