[Fwd: while row = c.fetchone(): # syntax error???]

[Alex Martelli]

"Bernhard Herzog" <herzog at online.de> wrote in message
news:m3lmy3hk0m.fsf at greebo.nodomain.de...
> "Alex Martelli" <alex at magenta.com> writes:
>
> > I've already mentioned one
> > class-based alternative, but another is:
> >
> >     for row in iterator(c.fetchone):
> >         doit(row)
> >
> > with, obviously, hidden somewhere in a myutil.py...:
> >
> > class iterator:
> >     def __init__(self,iter):
> >         self.iter=(iter,)
> >     def __getitem__(self,index):
> >         nextone=self.iter[0]()
> >         if not nextone:
> >             raise IndexError
> >         return nextone
>
> Why do you put iter into a tuple? Because functions are converted into
> methods sometimes? That shouldn't happen in this case, because iter is
> an instance variable. The conversion only happens for class attributes.

True.  It's just a habit I've tried to acquire when setting callable
objects as attributes of whatever -- just to avoid mysterious bugs
down the line.  Much like writing "if(0==x)" in C rather than the
other way 'round -- preventive-funny-idiom syndrome.


Alex