human
Complete this python program:
def cummingsify(poem):
assistant
#Here is the Python program you requested.

    """Randomly do one of the following:
    1. Return a cummingsified version of the poem.
    2. Raise a GibberishError.
    3. Raise a ValueError.
    """
    def success():
        return poem.lower()
    def gibberish():
        raise GibberishError()
    def bug():
        raise ValueError()
    return random.choice([success, gibberish, bug])()