请编写python网络爬虫程序，访问网站排行榜https://top.chinaz.com/all/，保存排行榜中前10页的所有内容到本地文件。要求： 1.代码函数化 2.代码中要适当添加注释

# 导入必要的库
import requests
from bs4 import BeautifulSoup
import os

# 函数：获取网页内容并解析
def get_html(url):
    """
    获取指定URL的HTML内容
    """
    try:
        # 使用requests发送GET请求
        response = requests.get(url)
        # 检查请求状态码，成功返回200
        if response.status_code == 200:
            return response.text
        else:
            print(f"Failed to fetch URL {url}, status code: {response.status_code}")
            return None
    except Exception as e:
        print(f"Error occurred while fetching the URL: {e}")
        return None

# 函数：解析并提取数据
def parse_content(html):
    """
    解析HTML内容，提取页面中的数据
    """
    soup = BeautifulSoup(html, 'lxml')
    # 查找所有div元素，通常包含排行数据
    data_divs = soup.find_all('div', class_='list-item')

    # 提取每个div的内容并存储
    result = []
    for div in data_divs[:10]:  # 取前10条数据
        title = div.find('a').text
        link = div.find('a')['href']
        result.append((title, link))
    
    return result

# 函数：保存数据到本地文件
def save_to_file(data, filename):
    """
    将数据保存为CSV文件
    """
    with open(filename, 'w', newline='', encoding='utf-8') as f:
        writer = csv.writer(f)
        writer.writerow(["排名", "链接"])
        writer.writerows(data)

# 主函数
def main():
    base_url = "https://top.chinaz.com/all/"
    page_count = 10  # 设置抓取的总页数

    # 遍历每一页
    for i in range(1, page_count + 1):
        url = f"{base_url}?p={i}"
        html_content = get_html(url)
        
        if html_content is not None:
            data = parse_content(html_content)
            file_name = f"rankings_page_{i}.csv"
            save_to_file(data, file_name)
            print(f"Page {i} processed, data saved to {file_name}")

if __name__ == "__main__":
    main()