如何正确显示特定单词在给定输入的用户中出现的次数？

def count_word_occurrences(text):
    # 预处理文本数据
    text = text.lower()
    text = text.replace(",", "").replace(".", "").replace("!", "").replace("?", "")

    # 分割文本为单词列表
    words = text.split()

    # 统计单词出现次数
    word_count = {}
    for word in words:
        if word in word_count:
            word_count[word] += 1
        else:
            word_count[word] = 1

    # 按照出现次数排序
    sorted_word_count = sorted(word_count.items(), key=lambda x: x[1], reverse=True)

    # 输出结果
    for word, count in sorted_word_count:
        print(f"{word}: {count}")

# 示例输入
input_text = "This is a sample text. It contains some words. This text is just for demonstration purposes."

# 调用函数进行统计
count_word_occurrences(input_text)

this: 2
is: 2
text: 2
a: 1
sample: 1
it: 1
contains: 1
some: 1
words: 1
just: 1
for: 1
demonstration: 1
purposes: 1