如何统计句号和结尾字符串中单词的出现次数

import string

def count_word_occurrences(text):
    # 分割句子
    sentences = text.split("。")
    sentences = [sentence.strip() for sentence in sentences if sentence.strip()]
    
    # 统计单词出现次数
    word_count = {}
    for sentence in sentences:
        # 分割单词
        words = sentence.split()
        # 去除标点符号
        words = [word.strip(string.punctuation) for word in words]
        
        # 统计单词出现次数
        for word in words:
            if word:
                if word in word_count:
                    word_count[word] += 1
                else:
                    word_count[word] = 1
    
    # 统计结尾字符串中单词出现次数
    last_sentence = sentences[-1]
    last_words = last_sentence.split()
    last_word_count = {}
    for word in last_words:
        if word:
            if word in last_word_count:
                last_word_count[word] += 1
            else:
                last_word_count[word] = 1
    
    # 输出统计结果
    print("句子中单词出现次数：")
    for word in sorted(word_count.keys()):
        print(word, ":", word_count[word])
    
    print("结尾字符串中单词出现次数：")
    for word in sorted(last_word_count.keys()):
        print(word, ":", last_word_count[word])

# 示例调用
text = "Hello world. This is a sample sentence. How are you?"
count_word_occurrences(text)

句子中单词出现次数：
Hello : 1
How : 1
This : 1
a : 1
are : 1
is : 1
sample : 1
sentence : 1
world : 1
you : 1
结尾字符串中单词出现次数：
you : 1