🇷🇺 Grab Framework Project

Project Status

Important notice: pycurl backend is dropped. The only network transport now is urllib3.

The project is being in a slow refactoring stage. It might be possible there will no be new feaures.

Things that are going to happen (no estimation time):

• Refactoring the source code while keeping most of external API unchanged
• Fixing bugs
• Annotating source code with type hints
• Improving quality of source code to comply with pylint and other linters
• Moving some features into external packages or moving external dependencies inside Grab
• Fixing memory leaks
• Improving test coverage
• Adding more platforms and python versions to test matrix
• Releasing new versions on pypi

Installation

$ pip install -U grab

See details about installing Grab on different platforms here http://docs.grablib.org/en/latest/usage/installation.html

Documentation

Get it here grab.readthedocs.io

Telegram chat groups

• Russian: t.me/grablab_ru
• English: t.me/grablab

About Grab (very old description)

Grab is a python web scraping framework. Grab provides a number of helpful methods to perform network requests, scrape web sites and process the scraped content:

• Automatic cookies (session) support
• HTTPS/SOCKS proxy support with/without authentication
• Keep-Alive support
• IDN support
• Tools to work with web forms
• Easy multipart file uploading
• Flexible customization of HTTP requests
• Automatic charset detection
• Powerful API to extract data from DOM tree of HTML documents with XPATH queries

Grab provides interface called Spider to develop multithreaded web-site scrapers:

• Rules and conventions to organize crawling logic
• Multiple parallel network requests
• Automatic processing of network errors (failed tasks go back to task queue)
• You can create network requests and parse responses with Grab API (see above)
• Different backends for task queue (in-memory, redis, mongodb)
• Tools to debug and collect statistics

Grab Example

    import logging

    from grab import Grab

    logging.basicConfig(level=logging.DEBUG)

    g = Grab()

    g.go('https://github.com/login')
    g.doc.set_input('login', '****')
    g.doc.set_input('password', '****')
    g.doc.submit()

    g.doc.save('/tmp/x.html')

    g.doc('//ul[@id="user-links"]//button[contains(@class, "signout")]').assert_exists()

    home_url = g.doc('//a[contains(@class, "header-nav-link name")]/@href').text()
    repo_url = home_url + '?tab=repositories'

    g.go(repo_url)

    for elem in g.doc.select('//h3[@class="repo-list-name"]/a'):
        print('%s: %s' % (elem.text(),
                          g.make_url_absolute(elem.attr('href'))))

Grab::Spider Example

    import logging

    from grab.spider import Spider, Task

    logging.basicConfig(level=logging.DEBUG)


    class ExampleSpider(Spider):
        def task_generator(self):
            for lang in 'python', 'ruby', 'perl':
                url = 'https://www.google.com/search?q=%s' % lang
                yield Task('search', url=url, lang=lang)

        def task_search(self, grab, task):
            print('%s: %s' % (task.lang,
                              grab.doc('//div[@class="s"]//cite').text()))


    bot = ExampleSpider(thread_number=2)
    bot.run()