如何找到唯一的词条出现次数？

def count_unique_words(text):
    # 预处理文本内容
    text = text.lower()
    text = text.replace(",", "").replace(".", "").replace("!", "").replace("?", "")

    # 分割文本内容为单词列表
    words = text.split(" ")

    # 创建字典用于存储词条及其出现次数
    word_count = {}

    # 统计词条出现次数
    for word in words:
        if word in word_count:
            word_count[word] += 1
        else:
            word_count[word] = 1

    return word_count

# 示例文本内容
text = "This is a sample text. It contains multiple words, some of which may appear more than once."

# 统计词条出现次数
result = count_unique_words(text)

# 输出每个唯一词条及其出现次数
for word, count in result.items():
    print(f"{word}: {count}")

this: 1
is: 1
a: 1
sample: 1
text: 1
it: 1
contains: 1
multiple: 1
words: 1
some: 1
of: 1
which: 1
may: 1
appear: 1
more: 1
than: 1
once: 1