问题是您给它提供了大写的字符串，但只与小写的值进行了比较.可以通过在函数的开头添加 word = word.lower()来解决此问题.

The problem is that you're giving it an uppercase string, but you only compare to lowercase values. This can be fixed by adding word = word.lower() to the start of your function.

def syllable_count(word):
    word = word.lower()
    count = 0
    vowels = "aeiouy"
    if word[0] in vowels:
        count += 1
    for index in range(1, len(word)):
        if word[index] in vowels and word[index - 1] not in vowels:
            count += 1
    if word.endswith("e"):
        count -= 1
    if count == 0:
        count += 1
    return count

print(syllable_count('HAIRY'))  # prints "2"