What is a quine?
q=chr(34)*3 s='q=chr(34)*3\ns={2!r}\na="""{0}"""\nb="""{1}"""\nprint(s.format(a,b,s))' a=""" A quine is... I just woke up from a nightmare.
Fractional Nested Sets: Solving a 30-Year-Old Tree Problem with Floats
The Problem with Nested Sets If you've ever stored a tree in a relational database, you've probably encountered the Modified Preorder Tree Traversal (MPTT) pattern — also known as nested sets. It's Joe Celko's classic: every node gets a lft and rgt integer,
← newer
2 / 2