关于用python写一个函数，基础题

不应该是school么？ 比例是0.333333333

def least_vowel_words(text):
    line=text.strip('.').split()
    wdict=dict()
    vowel='aeiouAEIOU'
    for word in line:
        num = 0.0
        for chr in word:
            if chr in vowel:
                num+=1
        r=str(float(num/len(word)))
        if r in wdict:
            wdict[r]=wdict[r]+[word]
        else:
            wdict[r]=[word]
    print wdict[min(wdict.keys())]

def isVowel(a):
    if a in "aeiouAEIOU":
        return True
    else:
        return False
 def Calculate(a):
    i = 0
    for s in a:
        if isVowel(s):
            i+=1
    return i/len(a)
def least_vowel_words(text):
        dicte = dict()
        list = text.strip('.').split()
        for a in range(0,len(list)):
            dicte[list[a]]= str(Calculate(list[a]))
        i=min(dicte.values())
        for k in dicte:
            if dicte[k]==i:
                print (str(i)+":"+str(k))