On 11 Jul 2012, at 8:03 AM, hasan alnator wrote: > Where ?? In the DAL chapter, toward the end of the "Logical operators" section.
http://web2py.com/books/default/chapter/29/6#Logical-operators > > On Wed, Jul 11, 2012 at 6:00 PM, Jonathan Lundell <jlund...@pobox.com> wrote: > On 11 Jul 2012, at 7:25 AM, Jonathan Lundell wrote: > > > > On 11 Jul 2012, at 7:19 AM, hasan alnator wrote: > >> ohh thank you Jonathan its working now , but can you tell me why ? i dont > >> understand > > > > web2py overloads & to perform a logical-and role here, but it can't alter > > Python's operator precedence. The & operator has higher precedence than ==, > > unlike the 'and' operator (or the '&&' operator in C). So this: > > > > video = db(db.Videos.Video_Type == "XXX" & db.Videos.Teacher == > > "xx").select(db.Videos.ALL) > > > > evaluates the same as this: > > > > video = db(db.Videos.Video_Type == ("XXX" & db.Videos.Teacher) == > > "xx").select(db.Videos.ALL) > > I added a line to the book pointing this out. >
