def is_uc_alpha(astring):
    """
    (str) -> Boolean

    return True if any char in astring is an 
    uppercase letter.
    else return False

    >>> is_uc_alpha('CIS122')
    True
    >>> is_uc_alpha('Ducks')
    True
    >>> is_uc_alpha('testing')
    False
    """
    for c in astring:
        if c.isupper():
            return True
    return False