How to use the pysle.pronunciationtools.TooManyVowelsInSyllable function in pysle

def _getSyllableNucleus(phoneList):
    '''
    Given the phones in a syllable, retrieves the vowel index
    '''
    cvList = ['V' if isletool.isVowel(phone) else 'C' for phone in phoneList]

    vowelCount = cvList.count('V')
    if vowelCount > 1:
        raise TooManyVowelsInSyllable(phoneList, cvList)

    if vowelCount == 1:
        stressI = cvList.index('V')
    else:
        stressI = None

    return stressI

def __init__(self, syllable, syllableCVMapped):
        super(TooManyVowelsInSyllable, self).__init__()
        self.syllable = syllable
        self.syllableCVMapped = syllableCVMapped