Where ??
On Wed, Jul 11, 2012 at 6:00 PM, Jonathan Lundell <[email protected]>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.
>
> >
> >
> >>
> >> On Wed, Jul 11, 2012 at 5:14 PM, Jonathan Lundell <[email protected]>
> wrote:
> >> On 11 Jul 2012, at 7:09 AM, hasan alnator wrote:
> >>> Dear David,
> >>>
> >>> the '&' is not supported when i use it i get this :
> >>>
> >>> unsupported operand type(s) for &: 'str' and 'Field'
> >>>
> >>
> >> video = db((db.Videos.Video_Type == "XXX") & (db.Videos.Teacher ==
> "xx")).select(db.Videos.ALL)
> >>
> >>
> >>> On Wed, Jul 11, 2012 at 1:41 PM, David Marko <[email protected]>
> wrote:
> >>> Should not this ...
> >>> video = db(db.Videos.Video_Type == "XXX" and db.Videos.Teacher ==
> "xx").select(db.Videos.ALL)
> >>>
> >>> be rather like this? (see and vs. &)
> >>> video = db(db.Videos.Video_Type == "XXX" & db.Videos.Teacher ==
> "xx").select(db.Videos.ALL)
> >
>
>
>
