def exclaim(sequence):
    result = []
    for element in sequence:
        result = result + [element + '!']
    return result

exclaim('hello')

['h!', 'e!', 'l!', 'l!', 'o!']

exclaim(['hello', 'world'])

['hello!', 'world!']

def exclaim(sequence):
    result = []
    for element in sequence:
        result = result + [(str(element)) + '!']
    return result

exclaim([1, 2.2, True])

['1!', '2.2!', 'True!']