如何删除或添加以特定字符或字符串开头的句子？

def process_sentences(text, prefix, remove=True):
    # 分割文本为句子列表
    sentences = text.split('. ')  # 假设以句号作为句子的分隔符

    # 遍历句子列表
    for sentence in sentences:
        if sentence.startswith(prefix):
            if remove:
                sentences.remove(sentence)  # 删除以特定字符或字符串开头的句子
            else:
                index = sentences.index(sentence)
                sentences[index] = prefix + sentence  # 添加特定字符或字符串到句子开头

    # 将句子列表重新拼接为文本
    processed_text = '. '.join(sentences)

    return processed_text

# 示例用法
text = "This is a sentence. Another sentence starts with 'Hello'. One more sentence starts with 'Hi'."
prefix = "Hello"

# 删除以特定字符或字符串开头的句子
processed_text = process_sentences(text, prefix, remove=True)
print(processed_text)
# 输出: This is a sentence. One more sentence starts with 'Hi'.

# 添加以特定字符或字符串开头的句子
processed_text = process_sentences(text, prefix, remove=False)
print(processed_text)
# 输出: This is a sentence. Hello Another sentence starts with 'Hello'. One more sentence starts with 'Hi'.