This document proposes relative clauses as syntactic sugar for Prolog, which allow us to write more concisely by avoiding repetitively naming variables. Relative clauses are written as a list of predicates surrounded by curly braces. They introduce a new variable, which is constrained by applying all of the included predicates to it. For example:
{red, block}
is equivalent to the query
| ; A REPL-based, annotated Seesaw tutorial | |
| ; Please visit https://github.com/daveray/seesaw for more info | |
| ; | |
| ; This is a very basic intro to Seesaw, a Clojure UI toolkit. It covers | |
| ; Seesaw's basic features and philosophy, but only scratches the surface | |
| ; of what's available. It only assumes knowledge of Clojure. No Swing or | |
| ; Java experience is needed. | |
| ; | |
| ; This material was first presented in a talk at @CraftsmanGuild in | |
| ; Ann Arbor, MI. |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" | |
| "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> | |
| <html xmlns="http://www.w3.org/1999/xhtml"> | |
| <head> | |
| <title>img</title> | |
| <link rel="stylesheet" href="css/supersized.css" type="text/css" media="screen" /> |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" | |
| "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
| <html xmlns="http://www.w3.org/1999/xhtml"> | |
| <head> | |
| <meta http-equiv="content-type" content="text/html; charset=utf-8"/> | |
| <title>Täheaabits</title> | |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> |
| print('Inside file foo.py; and __name__ is %s' % __name__) | |
| # ekraanile ilmub tekst: | |
| # Inside file foo.py; and __name__ is foo | |
| # kui foo.py käivitatakse otse, ilmub foo asemel: | |
| # Inside file foo.py; and __name__ is __main__ | |
| def do_something_cool(): | |
| print('Doing something cool...') |
| def hello(): | |
| print('Hello!') | |
| def say_greetings(name): | |
| print('Greetings, %s!' % name) | |
| # Python 3: | |
| # print('Greetings, {0}!'.format(name)) |
| def attach_foreignkey(objects, field, select_related=None): | |
| """ | |
| Shortcut method which handles a pythonic LEFT OUTER JOIN. | |
| ``attach_foreignkey(posts, Post.thread)`` | |
| """ | |
| field = field.field | |
| qs = field.rel.to.objects.filter(pk__in=distinct(getattr(o, field.column) for o in objects)) | |
| if select_related: | |
| qs = qs.select_related(*select_related) |