提示：Can you write a crawler to get view counts for the posts of this blog site: www.packetmania.net
回应：To retrieve the view counts for posts on www.packetmania.net, you can develop a web crawler that performs the following steps:
Access the Sitemap: Begin by fetching the site's sitemap, located at https://www.packetmania.net/sitemap.xml. This XML file lists all the URLs of the site's posts, facilitating efficient crawling.
Parse the Sitemap: Extract all post URLs from the tags within the sitemap.
Fetch Each Post: For each URL obtained, send an HTTP GET request to retrieve the HTML content of the post.
Extract View Counts: Analyze the HTML content to locate the view count. On PacketMania, the view count is typically found near the post's metadata. For example, in the post titled "IPv4 and IPv6 Header Checksum Algorithm Explained," the view count is displayed as follows: Views: 78
Your crawler should search for this pattern or similar indicators within the HTML to extract the view count.
Handle JavaScript Rendering: If the view counts are loaded dynamically via JavaScript, consider using tools like Selenium or Puppeteer, which can render JavaScript and allow you to extract the dynamically loaded content.
Respect Robots.txt and Terms of Service: Before initiating the crawling process, review the site's robots.txt file and terms of service to ensure compliance with their crawling policies.
Implement Rate Limiting: To avoid overwhelming the server, incorporate delays between your requests.
By following these steps, your crawler can systematically retrieve view counts for each post on PacketMania.
回应：Here’s a Python crawler using requests, BeautifulSoup, and re to extract view counts from blog posts on www.packetmania.net. This version assumes the view counts are rendered as plain text and not dynamically via JavaScript.
✅ Requirements Install required packages first (if not already installed):
回应：Here’s a JavaScript-rendered version of the crawler using Selenium with Python to extract view counts from www.packetmania.net. This handles sites where view counts are rendered dynamically via JavaScript.
✅ Prerequisites Install the required Python packages:
from selenium import webdriver from selenium.webdriver.chrome.options import Options from selenium.webdriver.common.by import By import time import requests from bs4 import BeautifulSoup import re
# Step 1: Get post URLs from sitemap defget_post_urls(sitemap_url): ... # Step 2: Use Selenium to render the page and extract view count defextract_view_count(driver, url): try: driver.get(url) time.sleep(2) # wait for page to render page_source = driver.page_source match = re.search(r'Views:\s*(\d+)', page_source) if match: returnint(match.group(1)) ...
# Step 3: Main function defcrawl_with_selenium(): ... # Setup headless Chrome chrome_options = Options() chrome_options.add_argument("--headless") chrome_options.add_argument("--disable-gpu") chrome_options.add_argument("--no-sandbox")
提示：Both python scripts returned "Found 0 posts.". Something wrong.
回应：It looks like I can't directly access the sitemap URL from my side. However, here's how you can troubleshoot it:
✅ Step-by-Step Fix
Open the Sitemap Manually：Visit this URL in your browser https://www.packetmania.net/sitemap.xml
Do you see a list of blog post URLs?
If it returns a 404 or is empty, the site might not use a standard XML sitemap.
Alternative: Crawl the Blog Index Page:If the sitemap is missing or not useful, you can extract post URLs by crawling from the main blog page, like https://www.packetmania.net/en/.
...
Let me know if the sitemap actually has content when you open it, or if you'd prefer the Selenium version of this updated crawler!
Your original sitemap does not contain /en/ in the URLs, so the filter if '/en/' in loc.text is incorrectly filtering everything out. Let's fix that. ... Here are the diff lines to fix the issue in your original script:
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- urls = [loc.text for loc in soup.find_all('loc') if '/en/' in loc.text] + urls = [loc.text for loc in soup.find_all('loc')]
That’s it! This change removes the unnecessary /en/ filter and allows the crawler to process all blog posts listed in the sitemap.
提示：Now it can find the pages, but the view count still missing:
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[1/61] Crawling https://www.packetmania.net/2025/03/09/PGITVW-4-twoptrs/ -> View count not found. [2/61] Crawling https://www.packetmania.net/2025/02/16/Harvard-CS50-AI-intro/ -> View count not found. ...
回应：Thanks — good progress! Now that URLs are loading, but no view count is found, it’s very likely that:
The view count is rendered dynamically by JavaScript, or
It's inside a specific HTML tag, not just plain text like Views: 123
🔍 Let’s Debug with Selenium
Update your Selenium version to inspect specific elements, rather than relying on regex over raw HTML. Here’s a diff-style fix for the extract_view_count() function in your crawler-javascript.py:
...
这时从 AI 的回应中2.，我发现它给出的程序中还有同样的错误：阅读次数的正则表达式（Regular Expression）匹配用的是英文
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match = re.search(r'Views:\s*(\d+)', page_source)
而实际的字符是阅读次数： 1448。下面让它纠正这个错误
提示：Actually the view count is shown as "阅读次数： 1448"
回应：Ah, perfect! The view count is shown in Chinese as: 阅读次数：1448。
Let’s update your Selenium-based crawler to search for this instead.
✅ Just update this part in extract_view_count():
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- elements = driver.find_elements(By.XPATH, "//*[contains(text(), 'Views')]") + elements = driver.find_elements(By.XPATH, "//*[contains(text(), '阅读次数')]")
And update the regex:
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- match = re.search(r'Views:\s*(\d+)', el.text) + match = re.search(r'阅读次数[:：]?\s*(\d+)', el.text)
... That should now correctly extract the Chinese-format view count from each blog post.
按照这两个 Diff 修改后，还是没有打印出阅读次数。继续让它排错
提示：Still not found
回应：Got it — since it’s still not found, let’s do a precise visual + DOM-based inspection. We’ll now:
Use Selenium to print out all elements containing "阅读次数".
Confirm the exact tag/structure where the view count lives.
✅ Debugging Version of extract_view_count()
Replace your current function with this debug version:
defextract_view_count(driver, url): try: driver.get(url) time.sleep(2) # Let JS render
# Print out all elements that contain "阅读次数" elements = driver.find_elements(By.XPATH, "//*[contains(text(), '阅读次数')]") for el in elements: print("Found text:", el.text) # Debug output match = re.search(r'阅读次数[:：]?\s*(\d+)', el.text) if match: returnint(match.group(1))
# Optional: print page source if nothing is found ifnot elements: print("No element with '阅读次数' found.") withopen("debug_output.html", "w", encoding="utf-8") as f: f.write(driver.page_source)
except Exception as e: print(f"Error processing {url}: {e}") returnNone
What This Does:
✅ Shows every el.text containing "阅读次数"
📄 Dumps HTML to debug_output.html if nothing is found
Helps us see how it’s rendered and where
🧠 Next Step
Run the script.
Look at Found text: ... output — does it show the view count?
If not, open debug_output.html and search for 阅读次数 — is it inside a <script>, inside Shadow DOM, or rendered with JavaScript framework?
Once you show me the actual line or structure from the HTML, I can give you the exact XPath to extract it. Want to do that now?
# Find parent element that includes view count elements = driver.find_elements(By.XPATH, "//*[contains(text(), '阅读次数')]/..") for el in elements: full_text = el.text match = re.search(r'阅读次数[:：]?\s*(\d+)', full_text) if match: views = int(match.group(1)) return views, title
except Exception as e: print(f"Error processing {url}: {e}") returnNone, None
📌 2. Main crawl function with sorting and CSV output
“Please generate a markdown table format with the sorted list”
“Please add the link to the Title in the table.”
“Can you add a far left column with the order from 1 to the last number of posts.”
“For the title, please strip out the ending "<space>*|*".”
回应：
Sure! Here's how to output the sorted results as a Markdown table (| URL | Views | Title |) directly from your Python script.
✅ Step: Add This to the End of crawl_packetmania()
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# Generate Markdown table withopen("packetmania_views.md", "w", encoding="utf-8") as f: f.write("| Views | Title |\n") f.write("|-------:|-------|\n") for url, views, title in results: safe_title = title.replace("|", "-") # prevent Markdown formatting issues f.write(f"| {views} | [{safe_title}]({url}) |\n")
📌 Sample Output
This will produce something like:
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| Views | Title | |-------:|-------| | 276 | [Harvard CS50 AI Intro](https://www.packetmania.net/2025/02/16/Harvard-CS50-AI-intro/) | | 41 | [PGITVW Part 4 - Two Pointers](https://www.packetmania.net/2025/03/09/PGITVW-4-twoptrs/) |
✅ Final Markdown Export Code (with Rank Column)
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# Generate Markdown table with rank, views, and linked titles withopen("packetmania_views.md", "w", encoding="utf-8") as f: f.write("| # | Views | Title |\n") f.write("|--:|------:|-------|\n") for idx, (url, views, title) inenumerate(results, 1): safe_title = title.replace("|", "-") # avoid breaking the table f.write(f"| {idx} | {views} | [{safe_title}]({url}) |\n")
📌 Output Example
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| # | Views | Title | |--:|------:|-------| | 1 | 276 | [Harvard CS50 AI Intro](https://www.packetmania.net/2025/02/16/Harvard-CS50-AI-intro/) | | 2 | 41 | [PGITVW Part 4 - Two Pointers](https://www.packetmania.net/2025/03/09/PGITVW-4-twoptrs/) | | 3 | 28 | [Cisco WiFi6 MU-MIMO](https://www.packetmania.net/2021/06/05/Cisco-WiFi6-MuMIMO/) |
✅ Fix: Strip trailing " | ..." from the title
Update the title cleaning line inside extract_view_count() like this:
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- title = driver.title.strip() + title = re.sub(r'\s*\|\s*.*$', '', driver.title.strip())
ChatGPT 完成这些任务没有一点压力，生成的程序没有问题。
支持双语博客
最后让 AI 在一个程序里支持本博客的中英文网站，可以用命令行选项--lang指定。ChatGPT 也很快搞定了。
"Add a command line option to generate Chinese output of the table md."
“please add timestamp to the name of generated md file. Also for command line option --lang, use different URL for English or Chinese: Default: Chinese (zh) URL: www.packetmania.net, --lang en URL: www.packetmania.net/en"
"The matching keyword for English would be "Views: "."
"Please also add en or zh to the name of generated md file."
"for the keyword, note the difference of ":" for English and “：” for Chinese."
For the markdown file name timestamp part, please add the time to the seconds.
回应：
✅ Step-by-Step Enhancements
Use argparse to add a --lang option
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import argparse
parser = argparse.ArgumentParser(description="PacketMania view count crawler") parser.add_argument("--lang", choices=["en", "zh"], default="en", help="Language for Markdown output (en or zh)") args = parser.parse_args()
Use language-specific headers
Update your Markdown export section:
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# Generate Markdown table with rank, views, and linked titles withopen("packetmania_views.md", "w", encoding="utf-8") as f: if args.lang == "zh": f.write("| 排名 | 阅读次数 | 标题 |\n") f.write("|-----:|----------:|------|\n") else: f.write("| # | Views | Title |\n") f.write("|--:|------:|-------|\n")
import time import re import requests import argparse import datetime from bs4 import BeautifulSoup from selenium import webdriver from selenium.webdriver.chrome.options import Options from selenium.webdriver.common.by import By ... defcrawl_packetmania(lang="zh"): base_url = "https://www.packetmania.net"if lang == "zh"else"https://www.packetmania.net/en" sitemap_url = f"{base_url}/sitemap.xml" keyword = "阅读次数"if lang == "zh"else"Views"
# Generate filename with timestamp to the second timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S") md_filename = f"packetmania_views_{timestamp}_{lang}.md"
This will produce filenames like packetmania_views_20250409_153244_zh.md.
回应：Here’s the complete updated crawler script with the following features:
✅ Crawls blog posts from PacketMania
✅ Uses Selenium to extract dynamically rendered view counts
✅ Extracts post titles
✅ Filters URLs to only those matching /YYYY/MM/DD/
✅ Sorts by view count in descending order
✅ Outputs a Markdown table with optional --lang zh for Chinese headers
✅ Markdown file named with timestamp to second
✅ Command line option for dual languages with language-specific base URL and view count match: