Skip to content

D4Vinci/Scrapling

BranchesTags

Repository files navigation

🕷️ Scrapling: Undetectable, Lightning-Fast, and Adaptive Web Scraping for Python

Tests PyPI version Supported Python versions PyPI Downloads

Dealing with failing web scrapers due to anti-bot protections or website changes? Meet Scrapling.

Scrapling is a high-performance, intelligent web scraping library for Python that automatically adapts to website changes while significantly outperforming popular alternatives. For both beginners and experts, Scrapling provides powerful features while maintaining simplicity.

>> from scrapling.default import Fetcher, StealthyFetcher, PlayWrightFetcher
# Fetch websites' source under the radar!
>> page = StealthyFetcher.fetch('https://example.com', headless=True, network_idle=True)
>> print(page.status)
200
>> products = page.css('.product', auto_save=True)  # Scrape data that survives website design changes!
>> # Later, if the website structure changes, pass `auto_match=True`
>> products = page.css('.product', auto_match=True)  # and Scrapling still finds them!

Sponsors

Evomi is your Swiss Quality Proxy Provider, starting at $0.49/GB

  • 👩‍💻 $0.49 per GB Residential Proxies: Our price is unbeatable
  • 👩‍💻 24/7 Expert Support: We will join your Slack Channel
  • 🌍 Global Presence: Available in 150+ Countries
  • ⚡ Low Latency
  • 🔒 Swiss Quality and Privacy
  • 🎁 Free Trial
  • 🛡️ 99.9% Uptime
  • 🤝 Special IP Pool selection: Optimize for fast, quality or quantity of ips
  • 🔧 Easy Integration: Compatible with most software and programming languages

Evomi Banner

Table of content

Key Features

Fetch websites as you prefer

  • HTTP requests: Stealthy and fast HTTP requests with Fetcher
  • Stealthy fetcher: Annoying anti-bot protection? No problem! Scrapling can bypass almost all of them with StealthyFetcher with default configuration!
  • Your preferred browser: Use your real browser with CDP, NSTbrowser's browserless, PlayWright with stealth mode, or even vanilla PlayWright - All is possible with PlayWrightFetcher!

Adaptive Scraping

  • 🔄 Smart Element Tracking: Locate previously identified elements after website structure changes, using an intelligent similarity system and integrated storage.
  • 🎯 Flexible Querying: Use CSS selectors, XPath, Elements filters, text search, or regex - chain them however you want!
  • 🔍 Find Similar Elements: Automatically locate elements similar to the element you want on the page (Ex: other products like the product you found on the page).
  • 🧠 Smart Content Scraping: Extract data from multiple websites without specific selectors using Scrapling powerful features.

Performance

  • 🚀 Lightning Fast: Built from the ground up with performance in mind, outperforming most popular Python scraping libraries (outperforming BeautifulSoup in parsing by up to 620x in our tests).
  • 🔋 Memory Efficient: Optimized data structures for minimal memory footprint.
  • ⚡ Fast JSON serialization: 10x faster JSON serialization than the standard json library with more options.

Developing Experience

  • 🛠️ Powerful Navigation API: Traverse the DOM tree easily in all directions and get the info you want (parent, ancestors, sibling, children, next/previous element, and more).
  • 🧬 Rich Text Processing: All strings have built-in methods for regex matching, cleaning, and more. All elements' attributes are read-only dictionaries that are faster than standard dictionaries with added methods.
  • 📝 Automatic Selector Generation: Create robust CSS/XPath selectors for any element.
  • 🔌 API Similar to Scrapy/BeautifulSoup: Familiar methods and similar pseudo-elements for Scrapy and BeautifulSoup users.
  • 📘 Type hints and test coverage: Complete type coverage and almost full test coverage for better IDE support and fewer bugs, respectively.

Getting Started

from scrapling import Fetcher

fetcher = Fetcher(auto_match=False)

# Fetch a web page and create an Adaptor instance
page = fetcher.get('https://quotes.toscrape.com/', stealthy_headers=True)
# Get all strings in the full page
page.get_all_text(ignore_tags=('script', 'style'))

# Get all quotes, any of these methods will return a list of strings (TextHandlers)
quotes = page.css('.quote .text::text')  # CSS selector
quotes = page.xpath('//span[@class="text"]/text()')  # XPath
quotes = page.css('.quote').css('.text::text')  # Chained selectors
quotes = [element.text for element in page.css('.quote .text')]  # Slower than bulk query above

# Get the first quote element
quote = page.css_first('.quote')  # / page.css('.quote').first / page.css('.quote')[0]

# Tired of selectors? Use find_all/find
quotes = page.find_all('div', {'class': 'quote'})
# Same as
quotes = page.find_all('div', class_='quote')
quotes = page.find_all(['div'], class_='quote')
quotes = page.find_all(class_='quote')  # and so on...

# Working with elements
quote.html_content  # Inner HTML
quote.prettify()  # Prettified version of Inner HTML
quote.attrib  # Element attributes
quote.path  # DOM path to element (List)

To keep it simple, all methods can be chained on top of each other!

Parsing Performance

Scrapling isn't just powerful - it's also blazing fast. Scrapling implements many best practices, design patterns, and numerous optimizations to save fractions of seconds. All of that while focusing exclusively on parsing HTML documents. Here are benchmarks comparing Scrapling to popular Python libraries in two tests.

Text Extraction Speed Test (5000 nested elements).

# Library Time (ms) vs Scrapling
1 Scrapling 5.44 1.0x
2 Parsel/Scrapy 5.53 1.017x
3 Raw Lxml 6.76 1.243x
4 PyQuery 21.96 4.037x
5 Selectolax 67.12 12.338x
6 BS4 with Lxml 1307.03 240.263x
7 MechanicalSoup 1322.64 243.132x
8 BS4 with html5lib 3373.75 620.175x

As you see, Scrapling is on par with Scrapy and slightly faster than Lxml which both libraries are built on top of. These are the closest results to Scrapling. PyQuery is also built on top of Lxml but still, Scrapling is 4 times faster.

Extraction By Text Speed Test

Library Time (ms) vs Scrapling
Scrapling 2.51 1.0x
AutoScraper 11.41 4.546x

Scrapling can find elements with more methods and it returns full element Adaptor objects not only the text like AutoScraper. So, to make this test fair, both libraries will extract an element with text, find similar elements, and then extract the text content for all of them. As you see, Scrapling is still 4.5 times faster at the same task.

All benchmarks' results are an average of 100 runs. See our benchmarks.py for methodology and to run your comparisons.

Installation

Scrapling is a breeze to get started with - Starting from version 0.2, we require at least Python 3.8 to work.

pip3 install scrapling
  • For using the StealthyFetcher, go to the command line and download the browser with
Windows OS 
camoufox fetch --browserforge
MacOS 
python3 -m camoufox fetch --browserforge
Linux 
python -m camoufox fetch --browserforge

On a fresh installation of Linux, you may also need the following Firefox dependencies:

  • Debian-based distros 
    sudo apt install -y libgtk-3-0 libx11-xcb1 libasound2
  • Arch-based distros 
    sudo pacman -S gtk3 libx11 libxcb cairo libasound alsa-lib

See the official Camoufox documentation for more info on installation

  • If you are going to use the PlayWrightFetcher options, then install Playwright's Chromium browser with:
playwright install chromium
  • If you are going to use normal requests only with the Fetcher class then update the fingerprints files with:
python -m browserforge update

Fetching Websites

Fetchers are basically interfaces that do requests or fetch pages for you in a single request fashion then return an Adaptor object for you. This feature was introduced because the only option we had before was to fetch the page as you want then pass it manually to the Adaptor class to create an Adaptor instance and start playing around with the page.

Features

You might be a little bit confused by now so let me clear things up. All fetcher-type classes are imported in the same way

from scrapling import Fetcher, StealthyFetcher, PlayWrightFetcher

And all of them can take these initialization arguments: auto_match, huge_tree, keep_comments, storage, storage_args, and debug which are the same ones you give to the Adaptor class.

If you don't want to pass arguments to the generated Adaptor object and want to use the default values, you can use this import instead for cleaner code:

from scrapling.default import Fetcher, StealthyFetcher, PlayWrightFetcher

then use it right away without initializing like:

page = StealthyFetcher.fetch('https://example.com')

Also, the Response object returned from all fetchers is the same as Adaptor object except it has these added attributes: status, reason, cookies, headers, and request_headers. All cookies, headers, and request_headers are always of type dictionary.

Note

The auto_match argument is enabled by default which is the one you should care about the most as you will see later.

Fetcher

This class is built on top of httpx with additional configuration options, here you can do GET, POST, PUT, and DELETE requests.

For all methods, you have stealth_headers which makes Fetcher create and use real browser's headers then create a referer header as if this request came from Google's search of this URL's domain. It's enabled by default.

You can route all traffic (HTTP and HTTPS) to a proxy for any of these methods in this format http://username:password@localhost:8030

>> page = Fetcher().get('https://httpbin.org/get', stealth_headers=True, follow_redirects=True)
>> page = Fetcher().post('https://httpbin.org/post', data={'key': 'value'}, proxy='http://username:password@localhost:8030')
>> page = Fetcher().put('https://httpbin.org/put', data={'key': 'value'})
>> page = Fetcher().delete('https://httpbin.org/delete')

StealthyFetcher

This class is built on top of Camoufox which by default bypasses most of the anti-bot protections. Scrapling adds extra layers of flavors and configurations to increase performance and undetectability even further.

>> page = StealthyFetcher().fetch('https://www.browserscan.net/bot-detection')  # Running headless by default
>> page.status == 200
True

Note: all requests done by this fetcher is waiting by default for all JS to be fully loaded and executed so you don't have to :)

For the sake of simplicity, expand this for the complete list of arguments
Argument Description Optional
url Target url ❌
headless Pass True to run the browser in headless/hidden (default), virtual to run it in virtual screen mode, or False for headful/visible mode. The virtual mode requires having xvfb installed. ✔️
block_images Prevent the loading of images through Firefox preferences. This can help save your proxy usage but be careful with this option as it makes some websites never finish loading. ✔️
disable_resources Drop requests of unnecessary resources for a speed boost. It depends but it made requests ~25% faster in my tests for some websites.
Requests dropped are of type font, image, media, beacon, object, imageset, texttrack, websocket, csp_report, and stylesheet. This can help save your proxy usage but be careful with this option as it makes some websites never finish loading.		 ✔️
google_search Enabled by default, Scrapling will set the referer header to be as if this request came from a Google search for this website's domain name. ✔️
extra_headers A dictionary of extra headers to add to the request. The referer set by the google_search argument takes priority over the referer set here if used together. ✔️
block_webrtc Blocks WebRTC entirely. ✔️
page_action Added for automation. A function that takes the page object, does the automation you need, then returns page again. ✔️
addons List of Firefox addons to use. Must be paths to extracted addons. ✔️
humanize Humanize the cursor movement. Takes either True or the MAX duration in seconds of the cursor movement. The cursor typically takes up to 1.5 seconds to move across the window. ✔️
allow_webgl Whether to allow WebGL. To prevent leaks, only use this for special cases. ✔️
disable_ads Enabled by default, this installs uBlock Origin addon on the browser if enabled. ✔️
network_idle Wait for the page until there are no network connections for at least 500 ms. ✔️
timeout The timeout in milliseconds that is used in all operations and waits through the page. The default is 30000. ✔️
wait_selector Wait for a specific css selector to be in a specific state. ✔️
proxy The proxy to be used with requests, it can be a string or a dictionary with the keys 'server', 'username', and 'password' only. ✔️
os_randomize If enabled, Scrapling will randomize the OS fingerprints used. The default is Scrapling matching the fingerprints with the current OS. ✔️
wait_selector_state The state to wait for the selector given with wait_selector. Default state is attached. ✔️

This list isn't final so expect a lot more additions and flexibility to be added in the next versions!

PlayWrightFetcher

This class is built on top of Playwright which currently provides 4 main run options but they can be mixed as you want.

>> page = PlayWrightFetcher().fetch('https://www.google.com/search?q=%22Scrapling%22', disable_resources=True)  # Vanilla Playwright option
>> page.css_first("#search a::attr(href)")
'https://github.com/D4Vinci/Scrapling'

Note: all requests done by this fetcher is waiting by default for all JS to be fully loaded and executed so you don't have to :)

Using this Fetcher class, you can make requests with:

  1. Vanilla Playwright without any modifications other than the ones you chose.
  2. Stealthy Playwright with the stealth mode I wrote for it. It's still a WIP but it bypasses many online tests like Sannysoft's.
    Some of the things this fetcher's stealth mode does include:
    • Patching the CDP runtime fingerprint.
    • Mimics some of the real browsers' properties by injecting several JS files and using custom options.
    • Using custom flags on launch to hide Playwright even more and make it faster.
    • Generates real browser's headers of the same type and same user OS then append it to the request's headers.
  3. Real browsers by passing the real_chrome argument or the CDP URL of your browser to be controlled by the Fetcher and most of the options can be enabled on it.
  4. NSTBrowser's docker browserless option by passing the CDP URL and enabling nstbrowser_mode option.

Hence using the real_chrome argument requires that you have chrome browser installed on your device

Add that to a lot of controlling/hiding options as you will see in the arguments list below.

Expand this for the complete list of arguments
Argument Description Optional
url Target url ❌
headless Pass True to run the browser in headless/hidden (default), or False for headful/visible mode. ✔️
disable_resources Drop requests of unnecessary resources for a speed boost. It depends but it made requests ~25% faster in my tests for some websites.
Requests dropped are of type font, image, media, beacon, object, imageset, texttrack, websocket, csp_report, and stylesheet. This can help save your proxy usage but be careful with this option as it makes some websites never finish loading.		 ✔️
useragent Pass a useragent string to be used. Otherwise the fetcher will generate a real Useragent of the same browser and use it. ✔️
network_idle Wait for the page until there are no network connections for at least 500 ms. ✔️
timeout The timeout in milliseconds that is used in all operations and waits through the page. The default is 30000. ✔️
page_action Added for automation. A function that takes the page object, does the automation you need, then returns page again. ✔️
wait_selector Wait for a specific css selector to be in a specific state. ✔️
wait_selector_state The state to wait for the selector given with wait_selector. Default state is attached. ✔️
google_search Enabled by default, Scrapling will set the referer header to be as if this request came from a Google search for this website's domain name. ✔️
extra_headers A dictionary of extra headers to add to the request. The referer set by the google_search argument takes priority over the referer set here if used together. ✔️
proxy The proxy to be used with requests, it can be a string or a dictionary with the keys 'server', 'username', and 'password' only. ✔️
hide_canvas Add random noise to canvas operations to prevent fingerprinting. ✔️
disable_webgl Disables WebGL and WebGL 2.0 support entirely. ✔️
stealth Enables stealth mode, always check the documentation to see what stealth mode does currently. ✔️
real_chrome If you have chrome browser installed on your device, enable this and the Fetcher will launch an instance of your browser and use it. ✔️
locale Set the locale for the browser if wanted. The default value is en-US. ✔️
cdp_url Instead of launching a new browser instance, connect to this CDP URL to control real browsers/NSTBrowser through CDP. ✔️
nstbrowser_mode Enables NSTBrowser mode, it have to be used with cdp_url argument or it will get completely ignored. ✔️
nstbrowser_config The config you want to send with requests to the NSTBrowser. If left empty, Scrapling defaults to an optimized NSTBrowser's docker browserless config. ✔️

This list isn't final so expect a lot more additions and flexibility to be added in the next versions!

Advanced Parsing Features

Smart Navigation

>>> quote.tag
'div'

>>> quote.parent
<data='<div class="col-md-8"> <div class="quote...' parent='<div class="row"> <div class="col-md-8">...'>

>>> quote.parent.tag
'div'

>>> quote.children
[<data='<span class="text" itemprop="text">“The...' parent='<div class="quote" itemscope itemtype="h...'>,
 <data='<span>by <small class="author" itemprop=...' parent='<div class="quote" itemscope itemtype="h...'>,
 <data='<div class="tags"> Tags: <meta class="ke...' parent='<div class="quote" itemscope itemtype="h...'>]

>>> quote.siblings
[<data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
 <data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
...]

>>> quote.next  # gets the next element, the same logic applies to `quote.previous`
<data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>

>>> quote.children.css_first(".author::text")
'Albert Einstein'

>>> quote.has_class('quote')
True

# Generate new selectors for any element
>>> quote.generate_css_selector
'body > div > div:nth-of-type(2) > div > div'

# Test these selectors on your favorite browser or reuse them again in the library's methods!
>>> quote.generate_xpath_selector
'//body/div/div[2]/div/div'

If your case needs more than the element's parent, you can iterate over the whole ancestors' tree of any element like below

for ancestor in quote.iterancestors():
    # do something with it...

You can search for a specific ancestor of an element that satisfies a function, all you need to do is to pass a function that takes an Adaptor object as an argument and return True if the condition satisfies or False otherwise like below:

>>> quote.find_ancestor(lambda ancestor: ancestor.has_class('row'))
<data='<div class="row"> <div class="col-md-8">...' parent='<div class="container"> <div class="row...'>

Content-based Selection & Finding Similar Elements

You can select elements by their text content in multiple ways, here's a full example on another website:

>>> page = Fetcher().get('https://books.toscrape.com/index.html')

>>> page.find_by_text('Tipping the Velvet')  # Find the first element whose text fully matches this text
<data='<a href="catalogue/tipping-the-velvet_99...' parent='<h3><a href="catalogue/tipping-the-velve...'>

>>> page.find_by_text('Tipping the Velvet', first_match=False)  # Get all matches if there are more
[<data='<a href="catalogue/tipping-the-velvet_99...' parent='<h3><a href="catalogue/tipping-the-velve...'>]

>>> page.find_by_regex(r'£[\d\.]+')  # Get the first element that its text content matches my price regex
<data='<p class="price_color">£51.77</p>' parent='<div class="product_price"> <p class="pr...'>

>>> page.find_by_regex(r'£[\d\.]+', first_match=False)  # Get all elements that matches my price regex
[<data='<p class="price_color">£51.77</p>' parent='<div class="product_price"> <p class="pr...'>,
 <data='<p class="price_color">£53.74</p>' parent='<div class="product_price"> <p class="pr...'>,
 <data='<p class="price_color">£50.10</p>' parent='<div class="product_price"> <p class="pr...'>,
 <data='<p class="price_color">£47.82</p>' parent='<div class="product_price"> <p class="pr...'>,
 ...]

Find all elements that are similar to the current element in location and attributes

# For this case, ignore the 'title' attribute while matching
>>> page.find_by_text('Tipping the Velvet').find_similar(ignore_attributes=['title'])
[<data='<a href="catalogue/a-light-in-the-attic_...' parent='<h3><a href="catalogue/a-light-in-the-at...'>,
 <data='<a href="catalogue/soumission_998/index....' parent='<h3><a href="catalogue/soumission_998/in...'>,
 <data='<a href="catalogue/sharp-objects_997/ind...' parent='<h3><a href="catalogue/sharp-objects_997...'>,
...]

# You will notice that the number of elements is 19 not 20 because the current element is not included.
>>> len(page.find_by_text('Tipping the Velvet').find_similar(ignore_attributes=['title']))
19

# Get the `href` attribute from all similar elements
>>> [element.attrib['href'] for element in page.find_by_text('Tipping the Velvet').find_similar(ignore_attributes=['title'])]
['catalogue/a-light-in-the-attic_1000/index.html',
 'catalogue/soumission_998/index.html',
 'catalogue/sharp-objects_997/index.html',
 ...]

To increase the complexity a little bit, let's say we want to get all books' data using that element as a starting point for some reason

>>> for product in page.find_by_text('Tipping the Velvet').parent.parent.find_similar():
        print({
            "name": product.css_first('h3 a::text'),
            "price": product.css_first('.price_color').re_first(r'[\d\.]+'),
            "stock": product.css('.availability::text')[-1].clean()
        })
{'name': 'A Light in the ...', 'price': '51.77', 'stock': 'In stock'}
{'name': 'Soumission', 'price': '50.10', 'stock': 'In stock'}
{'name': 'Sharp Objects', 'price': '47.82', 'stock': 'In stock'}
...

The documentation will provide more advanced examples.

Handling Structural Changes

Let's say you are scraping a page with a structure like this:

<div class="container">
    <section class="products">
        <article class="product" id="p1">
            <h3>Product 1</h3>
            <p class="description">Description 1</p>
        </article>
        <article class="product" id="p2">
            <h3>Product 2</h3>
            <p class="description">Description 2</p>
        </article>
    </section>
</div>

And you want to scrape the first product, the one with the p1 ID. You will probably write a selector like this

page.css('#p1')

When website owners implement structural changes like

<div class="new-container">
    <div class="product-wrapper">
        <section class="products">
            <article class="product new-class" data-id="p1">
                <div class="product-info">
                    <h3>Product 1</h3>
                    <p class="new-description">Description 1</p>
                </div>
            </article>
            <article class="product new-class" data-id="p2">
                <div class="product-info">
                    <h3>Product 2</h3>
                    <p class="new-description">Description 2</p>
                </div>
            </article>
        </section>
    </div>
</div>

The selector will no longer function and your code needs maintenance. That's where Scrapling's auto-matching feature comes into play.

from scrapling import Adaptor
# Before the change
page = Adaptor(page_source, url='example.com')
element = page.css('#p1' auto_save=True)
if not element:  # One day website changes?
    element = page.css('#p1', auto_match=True)  # Scrapling still finds it!
# the rest of the code...

How does the auto-matching work? Check the FAQs section for that and other possible issues while auto-matching.

Real-World Scenario

Let's use a real website as an example and use one of the fetchers to fetch its source. To do this we need to find a website that will change its design/structure soon, take a copy of its source then wait for the website to make the change. Of course, that's nearly impossible to know unless I know the website's owner but that will make it a staged test haha.

To solve this issue, I will use The Web Archive's Wayback Machine. Here is a copy of StackOverFlow's website in 2010, pretty old huh?
Let's test if the automatch feature can extract the same button in the old design from 2010 and the current design using the same selector :)

If I want to extract the Questions button from the old design I can use a selector like this #hmenus > div:nth-child(1) > ul > li:nth-child(1) > a This selector is too specific because it was generated by Google Chrome. Now let's test the same selector in both versions

>> from scrapling import Fetcher
>> selector = '#hmenus > div:nth-child(1) > ul > li:nth-child(1) > a'
>> old_url = "https://web.archive.org/web/20100102003420/http://stackoverflow.com/"
>> new_url = "https://stackoverflow.com/"
>> 
>> page = Fetcher(automatch_domain='stackoverflow.com').get(old_url, timeout=30)
>> element1 = page.css_first(selector, auto_save=True)
>> 
>> # Same selector but used in the updated website
>> page = Fetcher(automatch_domain="stackoverflow.com").get(new_url)
>> element2 = page.css_first(selector, auto_match=True)
>> 
>> if element1.text == element2.text:
...    print('Scrapling found the same element in the old design and the new design!')
'Scrapling found the same element in the old design and the new design!'

Note that I used a new argument called automatch_domain, this is because for Scrapling these are two different URLs, not the website so it isolates their data. To tell Scrapling they are the same website, we then pass the domain we want to use for saving auto-match data for them both so Scrapling doesn't isolate them.

In a real-world scenario, the code will be the same except it will use the same URL for both requests so you won't need to use the automatch_domain argument. This is the closest example I can give to real-world cases so I hope it didn't confuse you :)

Notes:

  1. For the two examples above I used one time the Adaptor class and the second time the Fetcher class just to show you that you can create the Adaptor object by yourself if you have the source or fetch the source using any Fetcher class then it will create the Adaptor object for you.

  2. Passing the auto_save argument with the auto_match argument set to False while initializing the Adaptor/Fetcher object will only result in ignoring the auto_save argument value and the following warning message

    Argument `auto_save` will be ignored because `auto_match` wasn't enabled on initialization. Check docs for more info.

    This behavior is purely for performance reasons so the database gets created/connected only when you are planning to use the auto-matching features. Same case with the auto_match argument.

  3. The auto_match parameter works only for Adaptor instances not Adaptors so if you do something like this you will get an error

    page.css('body').css('#p1', auto_match=True)

    because you can't auto-match a whole list, you have to be specific and do something like

    page.css_first('body').css('#p1', auto_match=True)

Find elements by filters

Inspired by BeautifulSoup's find_all function you can find elements by using find_all/find methods. Both methods can take multiple types of filters and return all elements in the pages that all these filters apply to.

  • To be more specific:
    • Any string passed is considered a tag name
    • Any iterable passed like List/Tuple/Set is considered an iterable of tag names.
    • Any dictionary is considered a mapping of HTML element(s) attribute names and attribute values.
    • Any regex patterns passed are used as filters
    • Any functions passed are used as filters
    • Any keyword argument passed is considered as an HTML element attribute with its value.

So the way it works is after collecting all passed arguments and keywords, each filter passes its results to the following filter in a waterfall-like filtering system.
It filters all elements in the current page/element in the following order:

  1. All elements with the passed tag name(s).
  2. All elements that match all passed attribute(s).
  3. All elements that match all passed regex patterns.
  4. All elements that fulfill all passed function(s).

Note: The filtering process always starts from the first filter it finds in the filtering order above so if no tag name(s) are passed but attributes are passed, the process starts from that layer and so on. But the order in which you pass the arguments doesn't matter.

Examples to clear any confusion :)

>> from scrapling import Fetcher
>> page = Fetcher().get('https://quotes.toscrape.com/')
# Find all elements with tag name `div`.
>> page.find_all('div')
[<data='<div class="container"> <div class="row...' parent='<body> <div class="container"> <div clas...'>,
 <data='<div class="row header-box"> <div class=...' parent='<div class="container"> <div class="row...'>,
...]

# Find all div elements with a class that equals `quote`.
>> page.find_all('div', class_='quote')
[<data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
 <data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
...]

# Same as above.
>> page.find_all('div', {'class': 'quote'})
[<data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
 <data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
...]

# Find all elements with a class that equals `quote`.
>> page.find_all({'class': 'quote'})
[<data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
 <data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
...]

# Find all div elements with a class that equals `quote`, and contains the element `.text` which contains the word 'world' in its content.
>> page.find_all('div', {'class': 'quote'}, lambda e: "world" in e.css_first('.text::text'))
[<data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>]

# Find all elements that don't have children.
>> page.find_all(lambda element: len(element.children) > 0)
[<data='<html lang="en"><head><meta charset="UTF...'>,
 <data='<head><meta charset="UTF-8"><title>Quote...' parent='<html lang="en"><head><meta charset="UTF...'>,
 <data='<body> <div class="container"> <div clas...' parent='<html lang="en"><head><meta charset="UTF...'>,
...]

# Find all elements that contain the word 'world' in its content.
>> page.find_all(lambda element: "world" in element.text)
[<data='<span class="text" itemprop="text">“The...' parent='<div class="quote" itemscope itemtype="h...'>,
 <data='<a class="tag" href="/tag/world/page/1/"...' parent='<div class="tags"> Tags: <meta class="ke...'>]

# Find all span elements that match the given regex
>> page.find_all('span', re.compile(r'world'))
[<data='<span class="text" itemprop="text">“The...' parent='<div class="quote" itemscope itemtype="h...'>]

# Find all div and span elements with class 'quote' (No span elements like that so only div returned)
>> page.find_all(['div', 'span'], {'class': 'quote'})
[<data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
 <data='<div class="quote" itemscope itemtype="h...' parent='<div class="col-md-8"> <div class="quote...'>,
...]

# Mix things up
>> page.find_all({'itemtype':"http://schema.org/CreativeWork"}, 'div').css('.author::text')
['Albert Einstein',
 'J.K. Rowling',
...]

Is That All?

Here's what else you can do with Scrapling:

  • Accessing the lxml.etree object itself of any element directly

    >>> quote._root
<Element div at 0x107f98870>

  • Saving and retrieving elements manually to auto-match them outside the css and the xpath methods but you have to set the identifier by yourself.

    • To save an element to the database: 
      >>> element = page.find_by_text('Tipping the Velvet', first_match=True)
>>> page.save(element, 'my_special_element')
    • Now later when you want to retrieve it and relocate it inside the page with auto-matching, it would be like this 
      >>> element_dict = page.retrieve('my_special_element')
>>> page.relocate(element_dict, adaptor_type=True)
[<data='<a href="catalogue/tipping-the-velvet_99...' parent='<h3><a href="catalogue/tipping-the-velve...'>]
>>> page.relocate(element_dict, adaptor_type=True).css('::text')
['Tipping the Velvet']
    • if you want to keep it as lxml.etree object, leave the adaptor_type argument 
      >>> page.relocate(element_dict)
[<Element a at 0x105a2a7b0>]

  • Filtering results based on a function

# Find all products over $50
expensive_products = page.css('.product_pod').filter(
    lambda p: float(p.css('.price_color').re_first(r'[\d\.]+')) > 50
)
  • Searching results for the first one that matches a function
# Find all the products with price '53.23'
page.css('.product_pod').search(
    lambda p: float(p.css('.price_color').re_first(r'[\d\.]+')) == 54.23
)

  • Doing operations on element content is the same as scrapy

    quote.re(r'regex_pattern')  # Get all strings (TextHandlers) that match the regex pattern
quote.re_first(r'regex_pattern')  # Get the first string (TextHandler) only
quote.json()  # If the content text is jsonable, then convert it to json using `orjson` which is 10x faster than the standard json library and provides more options

    except that you can do more with them like

    quote.re(
    r'regex_pattern',
    replace_entities=True,  # Character entity references are replaced by their corresponding character
    clean_match=True,       # This will ignore all whitespaces and consecutive spaces while matching
    case_sensitive= False,  # Set the regex to ignore letters case while compiling it
)

    Hence all of these methods are methods from the TextHandler within that contains the text content so the same can be done directly if you call the .text property or equivalent selector function.

  • Doing operations on the text content itself includes

    • Cleaning the text from any white spaces and replacing consecutive spaces with single space 
      quote.clean()
    • You already know about the regex matching and the fast json parsing but did you know that all strings returned from the regex search are actually TextHandler objects too? so in cases where you have for example a JS object assigned to a JS variable inside JS code and want to extract it with regex and then convert it to json object, in other libraries, these would be more than 1 line of code but here you can do it in 1 line like this 
      page.xpath('//script/text()').re_first(r'var dataLayer = (.+);').json()
    • Sort all characters in the string as if it were a list and return the new string 
      quote.sort(reverse=False)

    To be clear, TextHandler is a sub-class of Python's str so all normal operations/methods that work with Python strings will work with it.

  • Any element's attributes are not exactly a dictionary but a sub-class of mapping called AttributesHandler that's read-only so it's faster and string values returned are actually TextHandler objects so all operations above can be done on them, standard dictionary operations that don't modify the data, and more :)

    • Unlike standard dictionaries, here you can search by values too and can do partial searches. It might be handy in some cases (returns a generator of matches) 
      >>> for item in element.attrib.search_values('catalogue', partial=True):
        print(item)
{'href': 'catalogue/tipping-the-velvet_999/index.html'}
    • Serialize the current attributes to JSON bytes: 
      >>> element.attrib.json_string
b'{"href":"catalogue/tipping-the-velvet_999/index.html","title":"Tipping the Velvet"}'
    • Converting it to a normal dictionary 
      >>> dict(element.attrib)
{'href': 'catalogue/tipping-the-velvet_999/index.html',
'title': 'Tipping the Velvet'}

Scrapling is under active development so expect many more features coming soon :)

More Advanced Usage

There are a lot of deep details skipped here to make this as short as possible so to take a deep dive, head to the docs section. I will try to keep it updated as possible and add complex examples. There I will explain points like how to write your storage system, write spiders that don't depend on selectors at all, and more...

Note that implementing your storage system can be complex as there are some strict rules such as inheriting from the same abstract class, following the singleton design pattern used in other classes, and more. So make sure to read the docs first.

Important

A website is needed to provide detailed library documentation.
I'm trying to rush creating the website, researching new ideas, and adding more features/tests/benchmarks but time is tight with too many spinning plates between work, personal life, and working on Scrapling. I have been working on Scrapling for months for free after all.

If you like Scrapling and want it to keep improving then this is a friendly reminder that you can help by supporting me through the sponsor button.

⚡ Enlightening Questions and FAQs

This section addresses common questions about Scrapling, please read this section before opening an issue.

How does auto-matching work?

  1. You need to get a working selector and run it at least once with methods css or xpath with the auto_save parameter set to True before structural changes happen.

  2. Before returning results for you, Scrapling uses its configured database and saves unique properties about that element.

  3. Now because everything about the element can be changed or removed, nothing from the element can be used as a unique identifier for the database. To solve this issue, I made the storage system rely on two things:

    1. The domain of the URL you gave while initializing the first Adaptor object
    2. The identifier parameter you passed to the method while selecting. If you didn't pass one, then the selector string itself will be used as an identifier but remember you will have to use it as an identifier value later when the structure changes and you want to pass the new selector.

    Together both are used to retrieve the element's unique properties from the database later.

  4. Now later when you enable the auto_match parameter for both the Adaptor instance and the method call. The element properties are retrieved and Scrapling loops over all elements in the page and compares each one's unique properties to the unique properties we already have for this element and a score is calculated for each one.

  5. Comparing elements is not exact but more about finding how similar these values are, so everything is taken into consideration, even the values' order, like the order in which the element class names were written before and the order in which the same element class names are written now.

  6. The score for each element is stored in the table, and the element(s) with the highest combined similarity scores are returned.

How does the auto-matching work if I didn't pass a URL while initializing the Adaptor object?

Not a big problem as it depends on your usage. The word default will be used in place of the URL field while saving the element's unique properties. So this will only be an issue if you used the same identifier later for a different website that you didn't pass the URL parameter while initializing it as well. The save process will overwrite the previous data and auto-matching uses the latest saved properties only.

If all things about an element can change or get removed, what are the unique properties to be saved?

For each element, Scrapling will extract:

  • Element tag name, text, attributes (names and values), siblings (tag names only), and path (tag names only).
  • Element's parent tag name, attributes (names and values), and text.

I have enabled the auto_save/auto_match parameter while selecting and it got completely ignored with a warning message

That's because passing the auto_save/auto_match argument without setting auto_match to True while initializing the Adaptor object will only result in ignoring the auto_save/auto_match argument value. This behavior is purely for performance reasons so the database gets created only when you are planning to use the auto-matching features.

I have done everything as the docs but the auto-matching didn't return anything, what's wrong?

It could be one of these reasons:

  1. No data were saved/stored for this element before.
  2. The selector passed is not the one used while storing element data. The solution is simple
    • Pass the old selector again as an identifier to the method called.
    • Retrieve the element with the retrieve method using the old selector as identifier then save it again with the save method and the new selector as identifier.
    • Start using the identifier argument more often if you are planning to use every new selector from now on.
  3. The website had some extreme structural changes like a new full design. If this happens a lot with this website, the solution would be to make your code as selector-free as possible using Scrapling features.

Can Scrapling replace code built on top of BeautifulSoup4?

Pretty much yeah, almost all features you get from BeautifulSoup can be found or achieved in Scrapling one way or another. In fact, if you see there's a feature in bs4 that is missing in Scrapling, please make a feature request from the issues tab to let me know.

Can Scrapling replace code built on top of AutoScraper?

Of course, you can find elements by text/regex, find similar elements in a more reliable way than AutoScraper, and finally save/retrieve elements manually to use later as the model feature in AutoScraper. I have pulled all top articles about AutoScraper from Google and tested Scrapling against examples in them. In all examples, Scrapling got the same results as AutoScraper in much less time.

Is Scrapling thread-safe?

Yes, Scrapling instances are thread-safe. Each Adaptor instance maintains its state.

More Sponsors!

SerpApi Banner

Contributing

Everybody is invited and welcome to contribute to Scrapling. There is a lot to do!

Please read the contributing file before doing anything.

Disclaimer for Scrapling Project

Caution

This library is provided for educational and research purposes only. By using this library, you agree to comply with local and international laws regarding data scraping and privacy. The authors and contributors are not responsible for any misuse of this software. This library should not be used to violate the rights of others, for unethical purposes, or to use data in an unauthorized or illegal manner. Do not use it on any website unless you have permission from the website owner or within their allowed rules like the robots.txt file, for example.

License

This work is licensed under BSD-3

Acknowledgments

This project includes code adapted from:

  • Parsel (BSD License) - Used for translator submodule

Thanks and References

Known Issues

  • In the auto-matching save process, the unique properties of the first element from the selection results are the only ones that get saved. So if the selector you are using selects different elements on the page that are in different locations, auto-matching will probably return to you the first element only when you relocate it later. This doesn't include combined CSS selectors (Using commas to combine more than one selector for example) as these selectors get separated and each selector gets executed alone.
  • Currently, Scrapling is not compatible with async/await.
Designed & crafted with ❤️ by Karim Shoair.

About

Undetectable, Lightning-Fast, and Adaptive Web Scraping for Python

Topics

css python crawler automation scraping crawling selenium web-scraper python3 web-scraping dom-manipulation selectors xpath lxml stealth webscraping hacktoberfest crawling-python playwright web-scraping-python

Resources

Readme

License

BSD-3-Clause license

Code of conduct

Code of conduct
Activity

Stars

1.5k stars

Watchers

12 watching

Forks

75 forks
Report repository

Releases 11

v0.2.7 Latest
Nov 26, 2024
+ 10 releases

Sponsor this project

 
Learn more about GitHub Sponsors

Packages

No packages published

Contributors 3

Languages