Find the closest dictionary pronunciation to a provided pronunciation

def findClosestPronunciation(inputIsleWordList, aPron):
    '''
    Find the closest dictionary pronunciation to a provided pronunciation
    '''
    
    retList = _findBestPronunciation(inputIsleWordList, aPron)
    isleWordList = retList[0]
    bestIndex = retList[3]
    
    return isleWordList[bestIndex]