Feature Request: Support for the ':not' pseudo-class selector.

[gwelch]

The ':not(css_selector)' pseudo-selector class should be fairly simple feature to add. It is simply a negation on the contained 'css_selector'.

External Documentation:

W3: https://www.w3.org/TR/selectors/#negation
MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/:not
CSS-Tricks: https://css-tricks.com/almanac/selectors/n/not/

[Leonard Richardson (leonardr)]

This is a reasonable request, but the CSS selector system is contributed code, and I only add to it when a patch and test are contributed. I'm going to leave this issue open in a 'confirmed' state and if someone provides a patch I'll apply it.

[gwelch (gwelch925)]

TBH, I forgot about this request (mostly) due to a change in my work dynamic, however this feature could be very useful to me and the other QA that I work with. I checked out the source code and identified the function that would need to be modified (link below). Assuming I get a couple projects done, I should have some free time around the holidays. IMO, I would extract all the logic from the select() function and create CssSelector class following the Specification\Filter Pattern.

http://bazaar.launchpad.net/~leonardr/beautifulsoup/bs4/view/head:/bs4/element.py#L1331

[Leonard Richardson (leonardr)]

As long as the tests pass, feel free to refactor select() however you want.

[Leonard Richardson (leonardr)]

In fact, a refactoring should make it easy to fix https://bugs.launchpad.net/beautifulsoup/+bug/1507608

[Leonard Richardson (leonardr)]

Replacing the current select() implementation with SoupSieve (see issue #1809035) will add support for the :not pseudo-class.