Create crawler.py#1
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WalkthroughWalkthroughThe update introduces a web crawler script named Changes
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- crawler.py (1 hunks)
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crawler.py (1)
16-38: Implement a mechanism to limit the depth of the crawl to prevent infinite loops in case of cyclic links.
| import requests | ||
| from bs4 import BeautifulSoup | ||
| import csv |
There was a problem hiding this comment.
Consider grouping imports according to PEP 8 standards.
- import requests
- from bs4 import BeautifulSoup
- import csv
+ import csv
+ import requests
+ from bs4 import BeautifulSoupCommittable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.
| import requests | |
| from bs4 import BeautifulSoup | |
| import csv | |
| import csv | |
| import requests | |
| from bs4 import BeautifulSoup |
| while len(urls) != 0: | ||
| # get the page to visit from the list | ||
| current_url = urls.pop() | ||
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| # crawling logic | ||
| response = requests.get(current_url) | ||
| soup = BeautifulSoup(response.content, "html.parser") | ||
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| link_elements = soup.select("a[href]") | ||
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| for link_element in link_elements: | ||
| url = link_element["href"] | ||
| if "https://scrapeme.live/shop" in url: | ||
| urls.append(url) | ||
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| # if current_url is product page | ||
| product = {} | ||
| product["url"] = current_url | ||
| product["image"] = soup.select_one(".wp-post-image")["src"] | ||
| product["name"] = soup.select_one(".product_title").text() | ||
| product["price"] = soup.select_one(".price") | ||
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| products.append(product) |
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Add error handling for network requests and data extraction.
+ try:
response = requests.get(current_url)
soup = BeautifulSoup(response.content, "html.parser")
+ except requests.RequestException as e:
+ print(f"Request error: {e}")
+ continue
+ try:
product["image"] = soup.select_one(".wp-post-image")["src"]
product["name"] = soup.select_one(".product_title").text()
product["price"] = soup.select_one(".price")
+ except AttributeError as e:
+ print(f"Data extraction error: {e}")
+ continueCommittable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.
| while len(urls) != 0: | |
| # get the page to visit from the list | |
| current_url = urls.pop() | |
| # crawling logic | |
| response = requests.get(current_url) | |
| soup = BeautifulSoup(response.content, "html.parser") | |
| link_elements = soup.select("a[href]") | |
| for link_element in link_elements: | |
| url = link_element["href"] | |
| if "https://scrapeme.live/shop" in url: | |
| urls.append(url) | |
| # if current_url is product page | |
| product = {} | |
| product["url"] = current_url | |
| product["image"] = soup.select_one(".wp-post-image")["src"] | |
| product["name"] = soup.select_one(".product_title").text() | |
| product["price"] = soup.select_one(".price") | |
| products.append(product) | |
| while len(urls) != 0: | |
| # get the page to visit from the list | |
| current_url = urls.pop() | |
| # crawling logic | |
| try: | |
| response = requests.get(current_url) | |
| soup = BeautifulSoup(response.content, "html.parser") | |
| except requests.RequestException as e: | |
| print(f"Request error: {e}") | |
| continue | |
| link_elements = soup.select("a[href]") | |
| for link_element in link_elements: | |
| url = link_element["href"] | |
| if "https://scrapeme.live/shop" in url: | |
| urls.append(url) | |
| # if current_url is product page | |
| product = {} | |
| product["url"] = current_url | |
| try: | |
| product["image"] = soup.select_one(".wp-post-image")["src"] | |
| product["name"] = soup.select_one(".product_title").text() | |
| product["price"] = soup.select_one(".price") | |
| except AttributeError as e: | |
| print(f"Data extraction error: {e}") | |
| continue | |
| products.append(product) |
| product["url"] = current_url | ||
| product["image"] = soup.select_one(".wp-post-image")["src"] | ||
| product["name"] = soup.select_one(".product_title").text() | ||
| product["price"] = soup.select_one(".price") |
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Ensure that the .text() method is called for the "price" element to extract its text content.
- product["price"] = soup.select_one(".price")
+ product["price"] = soup.select_one(".price").text()Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.
| product["price"] = soup.select_one(".price") | |
| product["price"] = soup.select_one(".price").text() |
| with open('products.csv', 'w') as csv_file: | ||
| writer = csv.writer(csv_file) | ||
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| # populating the CSV | ||
| for product in products: | ||
| writer.writerow(product.values()) |
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Specify the newline parameter in open to prevent blank lines in the CSV file on certain platforms.
- with open('products.csv', 'w') as csv_file:
+ with open('products.csv', 'w', newline='') as csv_file:Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.
| with open('products.csv', 'w') as csv_file: | |
| writer = csv.writer(csv_file) | |
| # populating the CSV | |
| for product in products: | |
| writer.writerow(product.values()) | |
| with open('products.csv', 'w', newline='') as csv_file: | |
| writer = csv.writer(csv_file) | |
| # populating the CSV | |
| for product in products: | |
| writer.writerow(product.values()) |
| while len(urls) != 0: | ||
| # get the page to visit from the list | ||
| current_url = urls.pop() | ||
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| # crawling logic | ||
| response = requests.get(current_url) | ||
| soup = BeautifulSoup(response.content, "html.parser") | ||
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| link_elements = soup.select("a[href]") | ||
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| for link_element in link_elements: | ||
| url = link_element["href"] | ||
| if "https://scrapeme.live/shop" in url: | ||
| urls.append(url) | ||
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There was a problem hiding this comment.
Consider checking for duplicate URLs before appending to avoid re-visiting the same page.
+ if url not in urls:
urls.append(url)Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.
| while len(urls) != 0: | |
| # get the page to visit from the list | |
| current_url = urls.pop() | |
| # crawling logic | |
| response = requests.get(current_url) | |
| soup = BeautifulSoup(response.content, "html.parser") | |
| link_elements = soup.select("a[href]") | |
| for link_element in link_elements: | |
| url = link_element["href"] | |
| if "https://scrapeme.live/shop" in url: | |
| urls.append(url) | |
| while len(urls) != 0: | |
| # get the page to visit from the list | |
| current_url = urls.pop() | |
| # crawling logic | |
| response = requests.get(current_url) | |
| soup = BeautifulSoup(response.content, "html.parser") | |
| link_elements = soup.select("a[href]") | |
| for link_element in link_elements: | |
| url = link_element["href"] | |
| if "https://scrapeme.live/shop" in url: | |
| if url not in urls: | |
| urls.append(url) |
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| @@ -0,0 +1,46 @@ | |||
| # Simple web crawler | |||
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| import requests | |||
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All code in this file is indented at the top level (e.g., the imports), which will raise IndentationError: unexpected indent and prevent the script from running.
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| product = {} | ||
| product["url"] = current_url | ||
| product["image"] = soup.select_one(".wp-post-image")["src"] | ||
| product["name"] = soup.select_one(".product_title").text() |
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soup.select_one(".product_title").text() will crash because BeautifulSoup’s Tag.text is a property (and get_text() is the method), so calling .text() attempts to call a string.
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| # if current_url is product page | ||
| product = {} | ||
| product["url"] = current_url | ||
| product["image"] = soup.select_one(".wp-post-image")["src"] |
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The “if current_url is product page” extraction runs for every visited URL; on non-product pages select_one(...) can be None, so ...["src"] / later attribute access will raise at runtime.
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