walk calling visit within a class?

[Betancourt, Josef]

Thanks for the info and the 'lesson'.   I had other problems and thought
this was contributing to the problem.
I'll read up again on bound vs. unbound.


> -----Original Message-----
> From: Gordon McMillan [mailto:gmcm at hypernet.com]
> Sent: Friday, October 29, 1999 12:29 PM
> To: Betancourt, Josef; 'Python list'
> Subject: Re: walk calling visit within a class?
> 
> 
> Betancourt, Josef asks:
> 
> >    This is probably a dumb question but.... Lets say I have a
> >    class:
> > 
> > class theclass
> >       def aVisit(self, pat, dirname, dirlist):
> >   ............
> > 
> >  def testfiles(self, patobject, targetpath):
> >   os.path.walk( targetpath, self.aVisit, self.patobject)
> > 
> > #end class theclass
> > 
> > Since os.path.walk requires a visit function that has an argument
> > signature of:  (arg, dirname, names), how is a visit member
> > function used within a class?  Or can someone fill in the whole I
> > have in my Python fundamentals?
> 
> You're on the right track.
> 
> Fundamentals: theclass.aVisit is an "unbound" method; 
> calling it will require an instance of theclass as the first arg.
> 
> x = theclass()
> x.aVisit is a "bound" method - the self arg has been squirreled 
> away in the binding. It can therefor be called just like it was a 
> function. 
> 
> This code works:
> 
> import os
> 
> class theclass:
>     def __init__(self):
>         self.patobject = []
>         
>     def aVisit(self, pat, dirname, dirlist):
>           print "aVisit called on", dirname
> 
>     def testfiles(self, targetpath):
>          os.path.walk( targetpath, self.aVisit, self.patobject)
> 
> x = theclass()
> x.testfiles('c:/temp')
> 
> - Gordon
>